Thermodynamics MCQ 1800 MCQ with Answers
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Thermodynamics 1800 MCQ with Answers by Swai Singh 9414532268-69...
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Mechanical Engineering MCQ Thermodymics Thermodynamics Objective Type Questions And Answers (Top 150)
(c) tonne
(d) quintal
(e) newton. Answer : a
1. Which of the following variables controls the physical properties of a perfect gas
(a) pressure
(b) temperature
(c) volume
(d) all of the above
(e) atomic mass.
5. The unit of length in S.I. units is
(a) meter
(b) centimeter
(c) kilometer
(d) millimeter. Answer : a
Answer : d 2. The unit of temperature in S.I. units is
6. The unit of time in S.I. units is
(a) second
(b) minute
(a) Centigrade
(c) hour
(b) Celsius
(d) day
(c) Fahrenheit
(e) year.
(d) Kelvin
(e) Rankine.
Answer : a 7. The unit of energy in S.I. units is
Answer : d 3. Which of the following laws is applicable for the behavior of a perfect gas
(a) Boyle’s law
(b) Charles’law
(c) Gay-Lussac law
(d) all of the above
(e) Joule’s law.
(a) watt
(b) joule
(c) joule/s
(d) joule/m
(e) joule m. Answer : b 8. According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as
Answer : d 4. The unit of mass in S.I. units is
(a) kilogram
(b) gram
(a) temperature
(b) absolute
(c) absolute temperature, volume is kept constant
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(d) volume, if temperature is kept constant (e) remains constant,if volume and temperature are kept constant.
12. According to Dalton’s law, the total pres sure of the mixture of gases is equal to
Answer : c 9. General gas equation is
(a) PV=nRT
(b) PV=mRT
(d) PV = C
(c) PV=KiRT
(e) Cp-Cv = Wj
Answer : c
Answer : b 10. An ideal gas as compared to a real gas at very high pressure occupies
(a) greater of the partial pressures of all (b) average of the partial pressures of all (c) sum of the partial pressures of all (d) sum of the partial pressures of all divided by average molecular weight (e) atmospheric pressure.
13. The unit of pressure in S.I. units is
(a) kg/cm2
(b) mm of water column
(a) more volume
(c) pascal
(b) less volume
(d) dynes per square cm
(c) same volume
(e) bars
(d) unpredictable behaviour
(e) no such correlation.
Answer : c 14. Temperature of a gas is produced due to
Answer : a 11. Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits.
(a) 02, N2, steam, C02
(b) Oz, N2, water vapour
(c) S02, NH3, C02, moisture
(d) 02, N2, H2, air
(e) steam vapours, H2, C02.
(a) its heating value
(b) kinetic energy of molecules
(c) repulsion of molecules
(d) attraction of molecules
(e) surface tension of molecules. Answer : b 15. A closed system is one in which
Answer : d
(a) mass does not cross boundaries of the system, though energy may do so (b) mass crosses the boundary but not the energy
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(c) neither mass nor energy crosses the boundaries of the system (d) both energy and mass cross the boundaries of the system (e) thermodynamic reactions take place. Answer : a 16. According to kinetic theory of gases, the absolute zero temperature is attained when
Answer : a 19. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to
(a) T
(b) j
(c) J2
(d) Vr
(e) 1/Vr.
(a) volume of the gas is zero
Answer : a
(b) pressure of the gas is zero
(c) kinetic energy of the molecules is zero (d) specific heat of gas is zero
20. Superheated vapour behaves
(e) mass is zero. Answer : c
(a) exactly as gas
(b) as steam
(c) as ordinary vapour
(d) approximately as a gas
17. The pressure’of a gas in terms of its mean kinetic energy per unit volume E is equal to
(a) E/3
(b) E/2
(c) 3E/4
(d)2E/3
(e) 5E/4.
(e) as average of gas and vapour. Answer : d 21. No liquid can exist as liquid at
Answer : d
(a) – 273 °K
(b) vacuum
(c) zero pressure
(d) centre of earth
(e) in space. Answer : c
18. Kinetic theory of gases assumes that the collisions between the molecules are
22. Absolute zero pressure will occur
(a) perfectly elastic
(a) at sea level
(b) perfectly inelastic
(b) at the center of the earth
(c) partly elastic
(d) partly inelastic
(c) when molecular momentum of the system becomes zero (d) under vacuum conditions
(e) partly inelastic.
elastic
and
partly
(e) at a temperature of – 273 °K
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Answer : c
23. The unit of power in S.I. units is
(a) newton
(b) pascal
(c) erg
(d) watt
(e) joule. Answer : d 24. The condition of perfect vacuum, i.e., absolute zero pressure can be attained at
(a) a temperature of – 273.16°C
(b) a temperature of 0°C
(c) a temperature of 273 °K
(d) a negative pressure and 0°C temperature (e) can’t be attained. Answer : a 25. Specific heat of air at constant pressure is equal to
(a) 0.17
(b) 0.21
(c) 0.24
(d) 1.0
(e) 1.41 Answer : c 26. Intensive property of a system is one whose value
(a) depends on the mass of the system, like volume (b) does not depend on the mass of the system, like temperature, pressure, etc.
(c) is not dependent on the path followed but on the state (d) is dependent on the path followed and not on the state (e) remains constant. Answer : b 27. Characteristic gas constant of a gas is equal to
(a) C/Cv
(b) Cv/Cp
(c) Cp – Cv
(d) Cp + Cv
(e) Cp x Cv Answer : c 28. The behaviour of gases can be fully determined by
(a) 1 law
(b) 2 laws
(c) 3 laws
(d) 4 laws Answer : d 29. Boyle’s law i.e. pV = constant is applicable to gases under
(a) all ranges of pressures
(b) only small range of pressures
(c) high range of pressures
(d) steady change of pressures
(e) atmospheric conditions. Answer : b 30. The ratio of two specific heats of air is equal to
(a) 0.17
(b) 0.24
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(c) 0.1
(d) 1.41
(e) 2.71. Answer : d 31. Which law states that the internal energy of a gas is a function of temperature
(a) Charles’ law
(b) Joule’s law
(c) Regnault’s law
(d) Boyle’s law
(e) there is no such law. Answer : b 32. Which law states that the specific heat of a gas remains constant at all temperatures and pressures
(a) Charles’ Law
(b) Joule’s Law
(c) Regnault’s Law
(d) Boyle’s Law
(e) there is no such law.
Answer : c 35. Gases have
(a) only one value of specific heat
(b) two values of specific heat
(c) three values of specific heat
(d) no value of specific heat
(e) under some conditions one value and sometimes two values of specific heat. Answer : b 36. According to which law, all perfect gases change in volume by l/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant
Answer : c 33. The same volume of all gases would represent their
(a) densities
(b) specific weights
(c) molecular weights
(d) gas characteristic constants
(e) specific gravities.
(a) Joule’s law
(b) Boyle’s law
(c) Regnault’s law
(d) Gay-Lussac law
(e) Charles’ law. Answer : e 37. According Hypothesis
Answer : c 34. An open system is one in which
(a) mass does not cross boundaries of the system, though energy may do so (b) neither mass nor energy crosses the boundaries of the system (c) both energy and mass cross the boundaries of the system (d) mass crosses the boundary but not the energy (e) thermodynamic reactions do not occur.
to
Avogadro’s
(a) the molecular weights of all the perfect gases occupy the same
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volume under same conditions of pressure and temperature (b) the sum of partial pressure of mixture of two gases is sum of the two (c) product of the gas constant and the molecular weight of an ideal gas is constant (d) gases have two values of specific heat (e) all systems can be regarded as closed systems. Answer : a 38. Work done in a free expansion process is
(a) + ve
(b) -ve
(c) zero
(d) maximum
(e) minimum.
(b) Dalton’s law
(c) Gas law
(d) Law of thermodynamics
(e) Joule’s law. Answer : a 41. If a gas is heated against a pressure, keeping the volume constant, then work done will be equal to
(a) + v
(b) – ve
(c) zero
(d) pressure x volume
Answer : c 42. To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is
Answer : c 39. Extensive property of a system is one whose value
(a) depends on the mass of the system like volume (b) does not depend on the mass of the system, like temperature, pressure, etc. (c) is not dependent on the path followed but on the state (d) is dependent on the path followed and not on the state (e) is always constant.
(a) divided by its molecular weight (b) multiplied by its molecular weight (c) multiplied by its density (d) multiplied by its specific weight (e) divided by its specific weight. Answer : b 43. Properties of substances like pressure, temperature and density, in thermodynamic coordinates are
Answer : a
(e) any where between zero and infinity.
40. The statement that molecular weights of all gases occupy the same volume is known as
(a) path functions
(b) point functions
(c) cyclic functions
(a) Avogadro’s hypothesis
(d) real functions
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(e) thermodynamic functions.
Answer : b
44. An isolated system is one in which
(a) mass does not cross boundaries of the system, though energy may do so (b) neither mass nor energy crosses the boundaries of the system (c) both energy and mass cross the boundaries of the system (d) mass crosses the boundary but not the energy (e) thermodynamic reactions do not occur. Answer : b 45. Which of the following quantities is not the property of the system
(a) pressure
(b) temperature
(c) specific volume
(d) heat
(e) density. Answer : d 46. Mixture of ice and water form a
(a) closed system
(b) open system
(c) isolated system
(d) heterogeneous system
(e) thermodynamic system. Answer : d 47. According to Avogadro’s law, for a given pressure and temperature, each molecule of a gas
(a) occupies volume proportional to its molecular weight (b) occupies volume proportional to its specific weight (c) occupies volume inversely proportional to its molecular weight (d) occupies volume inversely proportional to its specific weight (e) occupies same volume. Answer : e 48. On weight basis, air contains following parts of oxygen
(a) 21
(b) 23
(c) 25
(d) 73
(e) 79. Answer : b 49. Which of the following is the property of a system
(a) pressure and temperature
(b) internal energy
(c) volume and density
(d) enthalpy and entropy
(e) all of the above. Answer : e 50. Which of the following is not the intensive property
(a) pressure
(b) temperature
(c) density
(d) heat
(e) specific volume. Answer : d
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51. Which of the following items is not a path function
(a) heat
(b) work
(c) kinetic energy
(d) vdp
(e) thermal conductivity. Answer : e
Answer : b 55. A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
(a) 54°C
(b) 327°C
(c) 108°C
(d) 654°C
(e) 600°C
52. Heat and work are Answer : b
(a) point functions
(b) system properties
(c) path functions
(d) intensive properties
(a) reversible process
(e) extensive properties.
(b) isothermal process
(c) adiabatic process
(d) irreversible process
(e) free expansion process.
Answer : c 53. Work done in an adiabatic process between a given pair of end states depends on
(a) the end states only
(b) particular adiabatic process
(c) the value of index n
(d) the value of heattransferred
(e) mass of the system. Answer : a
56. The value of n = 1 in the polytropic process indicates it to be
Answer : b 57. Solids and liquids have
(a) one value of specific heat (ft) two values of specific heat (c) three values of specific heat
(d) no value of specific heat
(e) one value under some conditions and two values under other conditions.
54. Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure
Answer : a 58. If value of n is infinitely large in a polytropic process pV” = C, then the process is known as constant
(a) enthalpy
(b) volume
(c) mass
(a) volume
(d) entropy
(b) pressure
(e) specific volume.
(c) temperature
(d) enthalpy
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62. Change in enthalpy of a system is the heat supplied at
(e) entropy. Answer : a 59. The index of compression n tends to reach ratio of specific heats y when
(a) flow is uniform and steady
(b) process is isentropic
(c) process is isothermal
(d) process is isentropic specific heat does not change temperature (e) process is isentropic specific heat changes temperature.
(a) constant pressure
(b) constant temperature
(c) constant volume
(d) constant entropy
(e) N.T.P. condition. Answer : a
and with and with
Answer : d
63. Zeroth law of thermodynamics
60. The term N.T.P. stands for
(a) nominal temperature and pressure (b) natural temperature and pressure (c) normal temperature and pressure (d) normal thermodynamic practice (e) normal thermodynamic pressure.
64. In an isothermal process, the internal energy of gas molecules
(a) increases
(b) decreases
(c) remains constant
61. A heat exchange process in which the product of pressure and volume remains constant is known as
(a) heat exchange process
(b) throttling process
(c) isentropic process
(d) adiabatic process
(e) hyperbolic process. Answer : e
(e) does not exist. Answer : c
Answer : c
(a) deals with conversion of mass and energy (b) deals with reversibility and irreversibility of process (c) states that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other (d) deals with heat engines
(d) may increase/decrease depending on the properties of gas (e) shows unpredictable behaviour. Answer : c 65. If a certain amount of dry ice is mixed with same amount of water at 80°C, the final temperature of mixture will be
(a) 80°C
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(b) 0°C
(a) 100 xlOO5 joules
(c) 40°C
(b) lxlO5 joules
(d) 20°C
(c) 10 xlO5 joules
(e) 60°C.
(d) 10 xlO5 kilo joules
(e) 10xl04ki\ojoules.
Answer : b
Answer : c
66. One watt is equal to
(a) 1 Nm/s
(b) 1 N/mt
(c) 1 Nm/hr
(d) 1 kNm/hr
(e) 1 kNm/mt.
70. For which of the following substances, the gas laws can be used with minimum error
Answer : a 67. Work done is following process
zero
(a) constant volume
(b) free expansion
(c) throttling
(d) all Of the above
(e) none of the above.
for
the
Answer : d 68. The basis for measuring thermodynamic property of temperature is given by
(a) zeroth law of thermodynamics
(b) first law of thermodynamics
(c) second law of thermodynamics (d) third law of thermodynamics (e) Avogadro’s hypothesis. Answer : a 69. In a non-flow reversible process for which p = (- 3V+ 15) x 105N/m2,V changes from 1 m to 2 m3. The work done will be about
(a) dry steam
(b) wet steam
(c) saturated steam
(d) superheated steam
(e) steam pressure.
at
atmospheric
Answer : d 71. On volume basis, air contains following parts of oxygen
(a) 21
(b) 23
(c) 25
(d) 77
(e) 79. Answer : a 72. The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is
(a) 29.27 kgfm/mol°K
(b) 8314kgfm/mol°K
(c) 848kgfm/mol°K
(d) 427kgfm/mol°K
(e) 735 kgfm/mol°K. Answer : c
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73. Universal gas constant is defined as equal to product of the molecular weight of the gas and
(b) 83.14J/kmol°K
(c) 848J/kmol°K
(d) All J/kmol °K
(a) specific heat at constant pressure (b) specific heat at constant volume (c) ratio of two specific heats
(e) 735 J/kmol °K.
(d) gas constant
(e) unity. Answer : d 74. For which of the following substances, the internal energy and enthalpy are the functions of temperature only
(a) any gas
(b) saturated steam
(c) water
(d) perfect gas
(e) superheated steam. Answer : d 75. In a free expansion process
(a) work done is zero
(b) heat transfer is zero
(c) both (a) and (b) above
(d) work done is zero but heat increases (e) work done is zero but heat decreases. Answer : c 76. The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is
(a) 29.27 J/kmol°K
Answer : b 77. If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as
(a) free expansion
(b) hyperbolic expansion
(c) adiabatic expansion
(d) parabolic expansion
(e) throttling. Answer : e 78. If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called
(a) free expansion
(b) hyperbolic expansion
(c) adiabatic expansion
(d) parabolic expansion
(e) throttling. Answer : a 79. The specific heat of air increases with increase in
(a) temperature
(b) pressure
(c) both pressure and temperature (d) variation of its constituents (e) air flow Answer : a
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80. Which of the following processes are thermodynamically reversible
(a) throttling
(b) free expansion
(c) constant volume and constant pressure (d) hyperbolic and pV = C
(e) isothermal and adiabatic. Answer : e 81. In order that a cycle be reversible, following must be satisfied
(a) free expansion or friction resisted expansion/compression process should not be encountered (b) when heat is being absorbed, temperature of hot source and working sub¬stance should be same (c) when beat is being rejected, temperature of cold source and working sub-stance should be same (d) all of the above
(b) minimum
(d) maximum
(d) infinity
(e) there is no such criterion. Answer : a 84. Minimum work in compressor is possible when the value of adiabatic index n is equal to
(a) 0.75
(b) 1
(c) 1.27
(d) 1.35
(e) 2. Answer : b 85. A gas is compressed in a cylinder by a movable piston to a volume onehalf its original volume. During the process 300 kJ heat left the gas and internal energy remained same. The work done on gas in Nm will be
(e) none of the above. Answer : d 82. Which of the following processes is irreversible process
(a) isothermal
(b) adiabatic
(c) throttling
(d) all of the above
(e) none of the above. Answer : c 83. For a thermodynamic process to be reversible, the temperature difference between hot body and working substance should be
(a) zero
(a) 300 Nm
(b) 300,000 Nm
(c) 30 Nm
(d) 3000 Nm
(e) 30,000 Nm. Answer : b 86. Molecular volume of any perfect gas at 600 x 103 N/m2 and 27°C will be
(a) 4.17m3/kgmol
(b) 400 m3/kg mol
(c) 0.15 m3/kg mol
(d) 41.7 m3/kg mol
(e) 417m3/kgmol. Answer : a
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87. The more effective way of increasing efficiency of Carnot engine is to
(e) mass and energy transfer do not take place. Answer : c
(a) increase higher temperature
(b) decrease higher temperature
(c) increase lower temperature
(d) decrease lower temperature
(e) keep constant.
lower
temperature
88. For reversible adiabatic process, change in entropy is
(a) maximum
(b) minimum
(c) zero
(d) unpredictable
(e) negative
(a) zeroth low of thermodynamic
(b) first law of thermodynamics
(a) heat transfer
(b) mass transfer
(c) change of temperature
(d) thermodynamic state of
pressure
and
(b) heat, work and properties of the system (c) various properties of the system (d) various thermodynamic processes (e) heat and internal energy.
93. According to thermodynamics
90. Isochoric process is one in which
(a) heat and work
Answer : b
Answer : a
(e) claussius statement.
92. First law of thermodynamics furnishes the relationship between
89. Entropy change depends on
(c) second law to thermodynamics (d) basic law of thermodynamics
Answer : b
Answer : c
(e) change volume.
Answer : d
91. Energy can neither be created nor destroyed but can be converted from one form to other is inferred from
(a) free expansion takes place (b) very little mechanical work is done by the system (c) no mechanical work is done by the system (d) all parameters remain constant
first
law
of
(a) work done by a system is equal to heat transferred by the system (b) total internal energy of a system during a process remains constant (c) internal energy, enthalpy and entropy during a process remain constant (d) total energy of a system remains constant
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(a) internal energy
(b) entropy
Answer : d
(c) thermal capacity
(d) enthalpy
94. In an isothermal process, the internal energy
(e) thermal conductance.
(e) entropy of a system remains constant.
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases (e) first decreases and then increases. Answer : c 95. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
Answer : d 98. First law of thermodynamics
(a) enables to determine change in internal energy of the system (b) does not help to predict whether the system will or not undergo a change (c) does not enable to determine change in entropy (d) provides relationship between heat, work and internal energy (e) all of the above. Answer : e
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy. Answer : a 96. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
(a) pressure
(b) temperature
(c) volume
(d) internal energy
(e) entropy. Answer : c 97. Total heat of a substance is also known as
99. According to thermodynamics
first
law
of
(a) mass and energy are mutually convertible (b) Carnot engine is most efficient (c) heat and work are mutually convertible (d) mass and light are mutually convertible (e) heat flows from hot substance to cold substance. Answer : c 100. Addition of heat at constant pressure to a gas results in
(a) raising its temperature
(b) raising its pressure
(c) raising its volume
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Answer : d 101. Measurement of temperature is based on
(a) thermodynamic properties
(b) zeroth law of thermodynamics
(c) first law of thermodynamics
another engine between T2 and 400°K For both to do equal work, value of T2 will be
(d) raising its temperature and doing external work (e) doing external work.
(d) second thermodynamics (e) joule’s law.
law
102. Carnot cycle has maximum efficiency for (a) reversible engine
(b) irreversible engine
(c) new engine
(d) petrol engine
(e) diesel engine.
(a) 650°K
(b) 600°K
(c) 625°K
(d) 700°K
(e) 750°K. Answer : a
of
Answer : b
105. Carnot cycle maximum when
(a) initial temperature is 0°K
(b) final temperature is 0°K
(c) working condition
(c) difference between initial and final temperature is 0°K (d) final temperature is 0°C (e) initial temperature is minimum possible.
106. If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly
103. Carnot cycle efficiency depends upon (a) properties of medium/substance used (b) condition of engine
is
Answer : b
Answer : a
efficiency
the
(a) temperature
(b) enthalpy
(c) internal energy
(d) entropy
(e) all of the above.
(d) temperature range of operation (e) effectiveness of insulating material around the engine. Answer : d 104. An engine operates between temperatures of 900°Kandr2 and
Answer : d 107. Which of the following represents the perpetual motion of the first kind
(a) engine with 100% thermal efficiency (b) a fully reversible engine
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(c) transfer of heat energy from low temperature source to high temperature source (d) a machine that continuously creates its own energy (e) production of energy by temperature differential in sea water at different levels.
(b) constant volume
(c) constant temperature
(d) constant enthaply
(e) any one of the above. Answer : c 111. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is
Answer : d 108. If a system after undergoing a series of processes, returns to the initial state then
(a) process is thermodynamically in equilibrium (b) process is executed in closed system cycle (c) its entropy will change due to irreversibility (d) sum of heat and work transfer will be zero (e) no work will be done by the system. Answer : d 109. An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
(a) feasible
(b) impossible
(c) possible
(a) justified
(b) not possible
110. In a Carnot cycle, heat is transferred at
(c) may be possible with lot of sophistications (d) cost will be very high (e) theroretically possible. Answer : b 112. A diathermic wall is one which
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages interaction (d) discourages interaction (e) does not exist.
thermal thermal
Answer : b 113. The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
(d) possible, but with lot of sophistications (e) desirable. Answer : d
(a) The room will be cooled to the temperature inside the refrigerator. (b) The room will be cooled very slightly.
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(c) The room will be gradually warmed up. (d) The temperature of the air in room will remain unaffected. (e) any one of above is possible depending on the capacity.
Answer : d 117. Water contained in a beaker can be made to boil by passing steam through it
(a) at atmospheric pressure
Answer : c
114. An adiabatic wall is one which
(b) at a pressure below the firuosphejric pressure (c) at a pressure greater than atmospheric pressure (d) any pressure
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages interaction (d) discourages interaction (e) dos not exist.
118. The energy of molecular motion appears as (a) heat
(b) potential energy
115. Compressed air coming out from a punctured football
(c) surface tension
(d) friction
(e) increase in pressure.
(b) becomes cooler1
thermal
(a) becomes hotter
Answer : c
Answer : a
(e) not possible.
thermal
(c) remains at the same temperature (d) may become hotter or cooler depend-ing upon the humidity of the surround¬ing air (e) attains atmospheric temperature. Answer : b
Answer : a 119. The unit’of constant is
universal
(a) watts/°K
(b) dynes/°C
(c) ergscm/°K
(d)erg/°K
(e) none of the above.
gas
116. During throttling process Answer : d
(a) heat exchange does not take place (b) no work is done by expanding steam (c) there is no change of internal energy of steam (d) all of the above (e) entropy decreases.
120. A sudden fall in the barometer reading is a sign of approaching
(a) fine weather
(b) rains
(c) storm
(d) cold wave
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125. The first law of thermodynamics is the law of
(e) hot wave. Answer : c 121. Calorie is a measure of
(a) specific heat
(b) quantity of heat
(c) thermal capacity
(d)entropy
(e) work.
(a) conservation of mass
(b) conservation of energy
(c) conservation of momentum
(d) conservation of heat
(e) conservation of temperature. Answer : b 126. Kelvin Planck’s law deals with
Answer : b 122. I kgf/cm2 is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) l00 mm Hg.
(a) conservation of heat
(b) conservation of work
(c) conversion of heat into work
(d) conversion fo work into heat
(e) conservation of mass. Answer : c 127. A perpetual motion machine is
Answer : c 123. One barometric pressure or 1 atmospheric pressure is equal to
(a) 1 kgf/cnr2
(b) 1.033 kgf/cm2
(c) 0 kgf/cm2
(d) 1.0197 kgf/cm2
(e) 100 kgf/cm2.
(a) a thermodynamic machine
(b) a non-thermodynamic machine (c) a hypothetical machine
Answer : d
Answer : b
128. According to Clausis statement of second law of thermodynamics
124. Barometric pressure is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) 100mm Hg. Answer : a
(d) a hypothetical machine whose opera-tion would violate the laws of thermodynamics (e) an inefficient machine.
(a) heat can’t be transferred from low temperature source to high temperature source (b) heat can be transferred for low temperature to high temperature source by using refrigeration cycle. (c) heat can be transferred from low temperature to high temperature
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source if COP of process is more than unity (d) heat can’t be transferred from low temperature to high temperature source without the aid of external energy (e) all of the above. Answer : d 129. Which of the following is an irreversible cycle
(a) carnot
(b) Stirling
(c) ericsson
(d) all of the above
(e) none of the above. Answer : e 130. Thermal power plant works on
(a) Carnot cycle
(b) Joule cycle
(d) Rankine cycle
(d) Otto cycle
(e) Brayton cycle. Answer : c 131. Otto cycle consists of following four processes
(a) two isothermals and two isentropics (b) two isentropics and two constant volumes (c) two isentropics, one constant volume and one constant pressure (d) two isentropics and two constant pres-sures (e) none of the above. Answer : b
132. For same compression ratio and for same heat added
(a) Otto cycle is more efficient than Diesel cycle (b) Diesel cycle is more efficient than Otto cycle (c) efficiency depends on other factors (d) both Otto and Diesel cycles are equally efficient (e) none of the above. Answer : a 133. The efficiency of a Carnot engine depends on
(a) working substance
(b) design of engine
(c) size of engine
(d) type of fuel fired
(e) temperatures of source and sink. Answer : e 134. The efficiency of Carnot cycle is maximum for
(a) gas engine
(b) well lubricated engine
(c) petrol engine
(d) steam engine
(e) reversible engine. Answer : e 135. Diesel cycle consists following four processes
of
(a) two isothermals and two isentropics (b) two isentropics, and two constant volumes.
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(c) two isentropics, one constant volume and one constant pressure (d) two isentropics and two constant pressures (e) none of the above.
(a) reversible cycles
(b) irreversible cycles
(c) quasi-static cycles
(d) semi-reversible cycles
(e) adiabatic irreversible cycles.
Answer : c
Answer : a
136. Carnot cycle is
(a) a reversible cycle (ft) an irreversible cycle (c) a semi-reversible cycle
(d) a quasi static cycle
(e) an adiabatic irreversible cycle. Answer : a 137. If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
140. Brayton cycle consists’ following four processes
(a) two isothermals and two isentropics (b) two isentropics and two constant volumes (c) two isentropics, one constant volume and one constant pressure (d) two isentropics and two constant pres-sures (e) none of the above. Answer : d
(a) more
(b) less
(c) equal
(a) Carnot cycle
(d) depends on other factors
(b) Rankine cycle
(e) none of the above.
(c) Brayton cycle
(d) Bell Coleman cycle
(e) Dual cycle.
Answer : c
141. Reversed joule cycle is called
138. A cycle consisting of two adiabatics and two constant pressure processes is known as
(a) Otto cycle
(b) Ericsson cycle
(c) Joule cycle
(d) Stirling cycle
(e) Atkinson cycle. Answer : c 139. Stirling and Ericsson cycles are
of
Answer : c 142. Which of the following cycles is not a reversible cycle
(a) Carnot
(b) Ericsson
(c) Stirling
(d) Joule
(e) none of the above. Answer : e
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143. The efficiency of Diesei cycle with decrease in cut off
(a) increases
(b) decreases
(c) remains unaffected
(d) first increases and then decreases (e) first decreases and then increases. Answer : a 144. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as
(a) Dual combustion cycle
(b) Diesel cycle
(c) Atkinson cycle
(d) Rankine cycle
(e) Stirling cycle.
Answer : a 147. The following cycle is used for air craft refrigeration
(a) Brayton cycle
(b) Joule cycle
(c) Carnot cycle
(d) Bell-Coleman cycle
(e) Reversed-Brayton cycle. Answer : e 148. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that
Answer : c 145. Which of the following cycles has maximum efficiency
(a) Rankine
(b) Stirling
(c) Carnot
(d) Brayton
(e) Joule.
(d) increase/decrease depending on application (e) unpredictable.
(a) carnot cycle can’t work with saturated steam (b) heat is supplied to water at temperature below the maximum temperature of the cycle (c) a rankine cycle receives heat at two places (d) rankine cycle is hypothetical (e) none of the above. Answer : b 149. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will
Answer : c 146. The ideal efficiency of a Brayton cycle without regeneration with increase ni pressure ratio will
(a) increase
(b) decrease
(c) remain unchanged
(a) increase
(b) decrease
(c) remain unchanged
(d) increase/decrease depending on ap-plication (e) unpredictable. “ Answer : b
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150. Gas turbine cycle consists of
(a) two isothermals and two isentropics (b) two isentropics and two constant volumes (c) two isentropics, one constant volume and one constant pressure (d) two isentropics and two constant pressures (e) none of the above.
4. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
Answer : d
A.specific heat volume B.specific heat pressure C.kilo Joule
2. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
A.Carnot cycle
B.Stirling cycle
C.Otto cycle
D.Diesel cycle Answer: D 3. The efficiency and work ratio of a simple gas turbine cycle are
A.low
B.very low
C.high
constant
A.True B.False Answer: A 6. An adiabatic process is one in which
A.no heat enters or leaves the gas
A.True B. False Answer: A
at
D.none of these Answer: A
1. All the commercial liquid fuels are derived from natural petroleum (or crude oil).
constant
5. There is a loss of heat in an irreversible process.
Thermodynamics MCQ SET-1
at
B.the temperature of the gas changes C.the change in internal energy is equal to the mechanical workdone D.all of the above Answer: D 7. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.
A.Correct B.Incorrect Answer: B 8. Which of the following represents Otto cycle on temperature – entropy (T – s) diagram?
D.very high Answer: B
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C.Nitrogen D.Carbon Answer: D 13. Workdone in a free expansion process is
A.zero
B.minimum
C.maximum
D.positive Answer: A 14. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.
9. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.
A.True B.False Answer: A 10. Which of the following is the lightest and most volatile liquid fuel?
A.Gasoline
B.Kerosene
C.Fuel oil Answer: A 11. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
A.flow processes
B.non-flow processes
C.adiabatic processes
A.one-half
B.one-third
C.two-third
D.three-fourth Answer: C 15. The compression ratio for petrol engines is
A.3 to 6
B.5 to 8
C.15 to 20
D.20 to 30 Answer: B 16. The most probable velocity of the gas molecules is given by
D.none of these Answer: A 12. Which of the following has the minimum atomic mass?
A.Oxygen
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Answer: B
21. Carbonisation of coal consists of
17. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
A. cut-off is increased
B. cut-off is decreased
C. cut-off is zero
D. cut-off is constant Answer: C
A. drying and crushing the coal to a fine powder B. moulding the finely ground coal under pressure with or without a binding material C. heating the wood with a limited supply of air to temperature not less than 280°C D. none of the above Answer: D
18.The entropy __________ in an irreversible cyclic process.
A. remains constant
B. decreases
C. increases Answer: C
22. The efficiency of Stirling cycle is __________ Carnot cycle.
A. greater than
B. less than
C. equal to
19. The atomic mass of oxygen is
A. 12
B. 14
C. 16
D. 32 Answer: C
23. According to Gay-Lussac law for a perfect gas, p/T = constant, if v is kept constant.
20. The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is
A. equal to one
B. less than one
C. greater than one
Answer: C
D. none of these Answer: C
A. True
B. False Answer: A
24. There is no change in internal energy in an isothermal process.
A. Correct
B. Incorrect Answer: A
Thermodynamics MCQ SET-2
25. If the value of n = 0 in the
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equation pvn = C, then the process is called
A. constant volume process
B. adiabatic process
C. constant pressure process
D. isothermal process
Answer: A
29. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called
Answer: C
26. The value of specific heat at constant pressure (cp) is __________ that of at constant volume (cv).
A. less than
B. equal to
C. more than
A. cracking
B. carbonisation
C. fractional distillation
D. full distillation Answer: C
Answer: C
27. When coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel, the process is known as __________ of fuel.
A. atomisation
B. carbonisation
30. Which of the following statement is incorrect?
Answer: B
A. The liquid fuels consist of hydrocarbons. B. The liquid fuels have higher calorific value than solid fuels. C. The solid fuels have higher calorific value than liquid fuels. D. A good fuel should have low ignition point. Answer: C
28. Which of the following is correct?
A. Absolute pressure = Gauge pressure + Atmospheric pressure B. Gauge pressure = Absolute pressure + Atmospheric pressure C. Atmospheric pressure = Absolute pressure + Gauge pressure D. Absolute pressure = Gauge pressure – Atmospheric pressure
31. Which of the following gas is mostly used in town for street and domestic lighting and heating?
A. Producer gas
B. Coal gas
C. Mond gas
D. Coke oven gas Answer: B
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32. The value of gas constant (R) in S. I. units is
A. 0.287 J/kgK
B. 2.87 J/kgK
C. 28.7 J/kgK
D. 287 J/kgK
A. equal to
B. directly proportional to
C. inversely proportional to Answer: B
37. The kinetic energy of molecules of a gas becomes zero at absolute zero temperature.
Answer: D
33. In the first law of thermodynamics, the total energy of the system remains constant.
A. True
B. False
A. Agree
B. Disagree Answer: A
38. One kg of carbon monoxide requires __________ kg of oxygen to produce 11/7 kg of carbon dioxide gas.
Answer: A
34. The efficiency of Diesel cycle increases with
A. decrease in cut-off
B. increase in cut-off
C. constant cut-off
D. none of these
A. All
B. 4/7
C. 11/4
D. 9/7 Answer: B
39. The absolute zero temperature is taken as
Answer: A
35. Coal gas is obtained by mixing coal and gas at ambient conditions.
A. Yes
B. No
A. -273°C
B. 273°C
C. 237°C
D. -237°C Answer: A
Answer: B
36. According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure.
40. The specific heat of water is
A. 1.817
B. 2512
C. 4.187
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restore the initial conditions at the end, is known as
D. none of these Answer: C
Thermodynamics MCQ
A. reversible cycle
B. irreversible cycle
C. thermodynamic cycle
D. none of these
SET-3
Answer: C
41. The constant pressure, constant volume and constant pvn processes are regarded as irreversible process.
45. An isothermal governed by
A. Boyle’s law
A. True
B. Charles’ law
B. False
C. Gay-Lussac law
D. Avogadro’s law
Answer: A
process
is
Answer: A 42. Stirling and Ericsson cycles are
A. reversible cycles
B. irreversible cycles
C. semi-reversible cycles
D. quasi-static cycles Answer: A
46. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as
A. workdone
B. entropy
C. enthalpy
D. none of these
43. When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
Answer: C
47. The value of 1 mm of Hg is equal to
A. zero
B. 1/5
C. 4/5
A. 1.333 N/m2
D. 1
B. 13.33 N/m2
C. 133.3 N/m2
D. 1333 N/m2
Answer: A
44. A series of operations, which takes place in a certain order and
Answer: C
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48. One kg of carbon requires 4/3 kg of oxygen and produces __________ kg of carbon monoxide gas.
A. 8/3
B. 11/3
C. 11/7
D. 7/3
whose sole purpose is to convert heat energy into work C. it is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body D. none of the above Answer: A
Answer: D 52. According to Gay-Lussac law, the absolute pressure of a given mass of a perfect gas varies __________ as its absolute temperature, when the volume remains constant.
49. The behaviour of a perfect gas, undergoing any change in the variables which control physical properties, is governed by
A. Boyle’s law
B. Charles’ law
C. Gay-Lussac law
D. all of these
A. directly
B. indirectly Answer: A
53. According to Avogadro’s law
Answer: D 50. The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant.
A. Correct
B. Incorrect Answer: A
A. the product of the gas constant and the molecular mass of an ideal gas is constant B. the sum of partial pressure of the mixture of two gases is sum of the two C. equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules D. all of the above Answer: C
51. According to Kelvin-Planck’s statement of second law of thermodynamics,
A. it is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work B. it is possible to construct an engine working on a cyclic process,
54. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called
A. isothermal process
B. hyperbolic process
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C. adiabatic process
D. polytropic process Answer: A
temperature remains constant. This statement is known as Charles’ law.
A. Yes
B. No
55. Which of the following gas has a minimum molecular mass?
A. Oxygen
B. Nitrogen
C. Hydrogen
D. Methane Answer: C
Answer: B
59. The fuel mostly used in steam boilers is
A. brown coal
B. peat
C. coking bituminous coal
D. non-coking bituminous coal
56. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as
Answer: D
60. The efficiency of Joule cycle is
A. law of equipartition of energy
A. greater than Carnot cycle
B. law of conservation of energy
B. less than Carnot cycle
C. law of degradation of energy
C. equal to Carnot cycle
D. none of these
D. none of these Answer: B
Answer: A
57. The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.
A. is equal to
B. is not equal to Answer: B
58. The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the
Thermodynamics MCQ SET-4
61. The hyperbolic governed by
A. Boyle’s law
B. Charles’ law
C. Gay-Lussac law
D. Avogadro’s law
process
Answer: A
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is
Mechanical Engineering MCQ Thermodymics
62. A closed system is one in which heat and work crosses the boundary of the system but the mass of the working substance does not crosses the boundary of the system.
A. Yes
B. No
A. It is used as the alternate standard of comparison of all heat engines. B. All the heat engines are based on Carnot cycle. C. It provides concept of maximising work output between the two temperature limits. D. all of the above
Answer: A
Answer: B
63. The entropy of water at 0°C is assumed to be
67. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called
A. 1
B. 0
C. -1
D. 10
A. Zeroth law of thermodynamics
B. First law of thermodynamics
Answer: B 64. The greater the pressure difference in throttling, the lesser is the irreversibility.
A. Yes
B. No Answer: B
65. During which of the following process does heat rejection takes place in Carnot cycle?
A. Isothermal expansion
B. Isentropic expansion
C. Isothermal compression
D. Isentropic compression Answer: C
66. Which is the incorrect statement about Carnot cycle?
C. Second law thermodynamics D. Kelvin Planck’s law
of
Answer: A
68. The area under the temperatureentropy curve (T – s curve) of any thermodynamic process represents
A. heat absorbed
B. heat rejected
C. either (a) or (b)
D. none of these Answer: C
69. The free expansion process is a constant enthalpy process.
A. Correct
B. Incorrect Answer: A
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Answer: A 70. The specific heat at constant volume is
A. the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure B. the amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume C. the amount of heat required to raise the temperature of 1 kg of water through one degree D. any one of the above
74. The blast furnace gas is a byproduct in the production of pig iron in the blast furnace.
A. Yes
B. No Answer: A
75. The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 – T1 = Rise in temperature, and R = Gas constant)
Answer: B
71. One kg of carbon produces __________ kg of carbon dioxide.
A. 3/7
B. 7/3
C. 11/3
D. 3/11
A. mR(T2 – T1)
B. mcv(T2 – T1)
C. mcp(T2 – T1)
D. mcp(T2 + T1) Answer: B
76. Liquid fuels have lower efficiency than solid fuels.
Answer: C
72. Ericsson cycle consists of two constant pressure and two isothermal processes.
A. Agree
B. Disagree Answer: A
A. True
B. False Answer: B
77. The heat absorbed during a polytropic process is
73. The isothermal and isentropic processes are reversible non-flow processes.
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Thermodynamics MCQ SET-5
81. The general gas energy equation is (where Q1 – 2 = Heat supplied, dU = Change in internal energy, and W1 – 2 = Work done in heat units) 78. Liquid hydrocarbons.
A. True
B. False
fuels
consist
of
Answer: A Answer: A
79. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
82. The compression ratio for Diesel engines is
A. 3 to 6
B. 5 to 8
C. 15 to 20
D. 20 to 30 Answer: C 83. In an isothermal process,
80. The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.
A. Agree
B. Disagree Answer: A
A. there is no change in temperature B. there is no change in enthalpy C. there is no change in internal energy D. all of these Answer: D
84. Which of the following is the
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correct statement of the second law of thermodynamics?
Answer: A A. It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. B. It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source. C. There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy. D. all of the above
88. The free expansion process is __________ non-flow process.
A. reversible
B. irreversible Answer: B 89. A mixture of gas expands from 0.03 m3 to 0.06 m3 at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is
Answer: D 85. The heating and expanding of a gas is called thermodynamic system.
A. Yes
B. No
A. 30 kJ
B. 54 kJ
C. 84 kJ
D. 114 kJ
Answer: B 86. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
A. combustion is at constant volume B. expansion and compression are isentropic C. maximum temperature is higher D. heat rejection is lower Answer: D
87. Liquid fuels have higher calorific value than solid fuels.
B. No
A. Yes
90. The gas constant (R) is equal to the __________ of two specific heats.
A. sum
B. difference
C. product
D. ratio Answer: B 91. Hydrogen is the __________ substance. A. lightest B. heaviest Answer: A
92. Otto cycle is also known as
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A. constant pressure cycle
B. constant volume cycle
C. constant temperature cycle
Answer: A
96. The efficiency of Diesel cycle depends upon
D. constant temperature and pressure cycle Answer: B 93. For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)
A. temperature limits
B. pressure ratio
C. compression ratio
D. cut-off ratio and compression ratio Answer: D
A. p v constant B. v/T constant C. p/T constant D. T/p constant
= constant, if T is kept 97. Those substances which have so far not been resolved by any means into other substances of simpler form are called
= constant, if p is kept = constant, if v is kept = constant, if v is kept
Answer: A
A. elements
B. compounds
C. atoms
D. molecules Answer: A
94. Producer gas is obtained by
A. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast B. carbonisation of bituminous coal C. passing steam over incandescent coke D. passing air and a large amount of steam over waste coal at about 650°C
98. The measurement of a thermodynamic property known as temperature is based on
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second thermodynamics D. none of these
law
Answer: A
Answer: A
99. Kelvin-Planck’s law deals with 95. The efficiency of a dual combustion cycle __________ upon cut-off ratio.
A. depends
B. does not depend
A. conservation of work
B. conservation of heat
C. conversion of heat into work
D. conversion of work into heat
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Answer: C
D. Heat motion
2. The term “thermodynamics” was first used in 1849 in the publication of a
A. Rudolph Clausius
B. William Rankine
C. Lord Kelvin
D. Thomas Savery
3. What law asserts that energy is a thermodynamic property?
A. First law of Thermodynamics
B. Second law of Thermodynamics
C. Third law of Thermodynamics
D. Zeroth law of Thermodynamics
4. What law asserts that energy has quality as well as quantity?
A. First law of Thermodynamics
B. Second law of Thermodynamics
C. Third law of Thermodynamics
D. Zeroth law of Thermodynamics
MCQs Part I 1. The term “thermodynamics” comes from Greek words “therme” and “dynamis” which means _______.
A. Heat power
B. Heat transfer
C. Heat energy
5. The macroscopic approach to the study of thermodynamics does not require a knowledge of the behavior of individual particles is called _____.
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A. Dynamic thermodynamics
B. Static thermodynamics
C. Statistical thermodynamics
D. Classical thermodynamics
6. What is the more elaborate approach to the study of thermodynamics and based on the average behavior of large groups of individual particles?
9. What is the mass or region outside the system called?
A. Surroundings
B. Boundary
C. Volume
D. Environment
10. What is the real or imaginary surface that separates the system from its surroundings?
A. Dynamic thermodynamics
B. Static thermodynamics
A. Division
C. Statistical thermodynamics
B. Wall
D. Classical thermodynamics
C. Boundary
7. What is defined a region in space chosen for study?
D. Interface
A. Surroundings
B. System
C. Boundary
D. Volume
8. The first law of thermodynamics is based on which of the following principles?
A. Conservation of mass
B. Conservation of energy
C. Action and reaction
D. The entropy-temperature relationship
11. A system which consists of fixed amount of mass and no mass can cross its boundary called _____.
A. Equilibrium system
B. Thermal equilibrium system
C. Open system
D. Closed system
12. A system in which even energy is not allowed to cross the boundary is called ____.
A. Closed system
B. Exclusive system
C. Isolated system
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D. Special system
13. A system in which there is a flow of mass is known as _____.
C. Phase
D. Cycle
17. How are thermodynamic properties classified?
A. Equilibrium system
B. Isolated system
A. Physical and chemical
C. Open system
B. Intensive and extensive
D. Closed system
C. Real and imaginary
D. Homogeneous and heterogeneous
14. Open system usually encloses which of the following devices?
A. Compressor
B. Turbine
C. Nozzle
A. Extensive property
D. All of the above
B. Intensive property
C. Open property
D. Closed property
15. The boundaries of a control volume, which may either real or imaginary is called _____.
18. The thermodynamic properties that are independent on the size of the system is called _____.
A. Control boundary
B. Control system
C. Interface
A. Extensive property
D. Control surface
B. Intensive property
C. Open property
D. Closed property
16. Any characteristic of a thermodynamics system is called a _____.
A. Property
B. Process
19. The thermodynamic properties that are dependent on the size or extent of the system is called _____.
20. Which is NOT an intensive property of thermodynamics?
A. Temperature
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B. Mass
A. Pressure
C. Pressure
B. Thermal
D. Density
C. Mechanical
D. Phase
21. Which is NOT an extensive property of thermodynamics?
25. If a system involves two phases, it is in ______ equilibrium when the mass of each phase reaches an equilibrium level and stays there.
A. Density
B. Mass
C. Volume
A. Chemical
D. Energy
B. Thermal
C. Mechanical
D. Phase
22. Extensive properties per unit mass are called _____.
A. Specific properties
B. Relative properties
C. Unit properties
D. Phase properties
23. A system is in ______ equilibrium if the temperature is the same throughout the entire system.
A. Static
B. Thermal
C. Mechanical
D. Phase
24. A system is in ______ equilibrium if there is no change in pressure at any point of the system with time.
26. A system is in ______ equilibrium of its chemical composition does not change with time, i.e., no chemical reaction occurs.
A. Chemical
B. Thermal
C. Mechanical
D. Phase
27. “The state of a simple compressible system is completely specified by two independent, intensive properties”. This is known as ______.
A. Equilibrium postulate
B. State postulate
C. Environment postulate
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D. Compressible system postulate
28. What is the unit of the total energy of the system?
A. Kj
B. Kj/Kg
C. Kg
D. g
29. Without electrical, mechanical, gravitational, surface tension and motion effects, a system is called _____ system.
B. Phase
C. Cycle
D. Direction
32. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?
A. 4
B. 3
C. 2
D. 1
33. What is a process in which the system remains infinitesimally closed to an equilibrium state at all times?
A. Simple
B. Simple compressible
C. Compressible
A. Path equilibrium process
D. Independent
B. Cycle equilibrium process
C. Phase equilibrium process
D. Quasi-state or quasiequilibrium process
30. What refers to any change that a system undergoes from one equilibrium state to another equilibrium state?
A. Process
B. Path
C. Phase
A. Control mass
D. Cycle
B. Control volume
C. Control energy
D. Control temperature
31. What refers to the series of state through which a system passes during a process?
34. A closed system may refer to ______.
A. Path
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35. An open system may refer to ______.
D. Isometric process
39. What is a process during which the pressure remains constant?
A. Control mass
B. Control volume
A. Isobaric process
C. Control energy
B. Isothermal process
D. Control temperature
C. Isochoric process
36. A system is said to be in thermodynamic equilibrium if it maintains ______ equilibrium.
D. Isometric process
A. Mechanical and phase
B. Thermal and chemical
C. Thermal, mechanical and chemical
D. Thermal, phase, mechanical and chemical
37. What is a process with identical end states called?
A. Cycle
B. Path
C. Phase
D. Either path or phase
38. What is a process during which the temperature remains constant?
A. Isobaric process
B. Isothermal process
C. Isochoric process
40. What is a process during which the specific volume remains constant?
A. Isobaric process
B. Isothermal process
C. Isochoric or isometric process
D. Isovolumetric process
41. The prefix “iso” used to designate a process means ______.
A. Cannot be interchanged
B. Remains constant
C. Approximately equal
D. Slight difference
42. What does the term “steady” implies?
A. No change with volume
B. No change with time
C. No change with location
D. No change with mass
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43. What does the tem “uniform” implies?
A. No change with volume
B. No change with time
C. No change with location
D. No change with mass
44. What is defined as a process during which a fluid flows through a control volume steadily?
D. External energy
47. What form of energy refers to those a system possesses as a whole with respect to some outside reference frame, such as potential and kinetic energies?
A. Macroscopic form of energy
B. Microscopic form of energy
C. Internal energy
D. External energy
A. Transient-flow process
B. Steady and uniform process
C. Uniform-flow process
A. William Rankine
D. Steady-flow process
B. Rudolph Clausius
C. Lord Kelvin
D. Thomas Young
45. The sum of all the microscopic form of energy is called _____.
A. Total energy
B. Internal energy
C. System energy
D. Phase energy
46. What type of system energy is related to the molecular structure of a system?
A. Macroscopic form of energy
B. Microscopic form of energy
C. Internal energy
48. Who coined the word “energy” in 1807?
49. The molecules of a gas moving through space with some velocity possesses what kind of energy?
A. Translational energy
B. Spin energy
C. Rotational kinetic energy
D. Sensible energy
50. The electrons in an atom which rotate about the nucleus possess what kind of energy?
A. Translational energy
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B. Spin energy
C. Rotational kinetic energy
D. Sensible energy
MCQs Part II 51. The electrons which spins about its axis will possess what kind of energy?
A. Translational energy
B. Spin energy
C. Rotational kinetic energy
D. Sensible energy
52. What refers to the portion of the internal energy of a system associated with the kinetic energies of the molecules?
A. Translational energy
B. Spin energy
C. Rotational kinetic energy
D. Sensible energy
53. What is the internal energy associated with the phase of a system called?
A. Chemical energy
B. Latent energy
C. Phase energy
D. Thermal energy
54. What is the internal energy associated with the atomic bonds in a molecule called?
A. Chemical energy
B. Latent energy
C. Phase energy
D. State energy
55. What is the extremely large amount of energy associated with the strong bonds within the nucleus of the atom itself called?
A. Chemical energy
B. Latent energy
C. Phase energy
D. Nuclear energy
56. What are the only two forms of energy interactions associated with a closed system?
A. Kinetic energy and heat
B. Heat transfer and work
C. Thermal energy and chemical energy
D. Latent energy and thermal energy
57. What states that if two bodies are in thermal equilibrium with a third body,
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they are also in equilibrium with each other?
D. Rankine scale
61. What temperature scale is identical to the Kelvin scale?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
A. Ideal gas temperature scale
C. Second law of thermodynamics
B. Ideal temperature scale
C. Absolute gas temperature scale
D. Triple point temperature scale
D. Third law of thermodynamics
58. Who formulated the zeroth law of thermodynamics in 1931?
A. A. Celsuis
B. A. Einstein
C. R.H. Fowler
D. G. Fahrenheit
59. What is the thermodynamic temperature scale in the SI system?
A. Kelvin scale
B. Celsius scale
C. Fahrenheit scale
D. Rankine scale
60. What is the thermodynamic temperature scale in the English system?
A. Kelvin scale
B. Celsius scale
C. Fahrenheit scale
62. The temperatures of the ideal gas temperature scale are measured by using a ______.
A. Constant-volume gas thermometer
B. Constant-mass gas thermometer
C. Constant-temperature gas thermometer
D. Constant-pressure gas thermometer
63. What refers to the strong repulsion between the positively charged nuclei which makes fusion reaction difficult to attain?
A. Atomic repulsion
B. Nuclear repulsion
C. Coulomb repulsion
D. Charge repulsion
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64. What gas thermometer is based on the principle that at low pressure, the temperature of a gas is proportional to its pressure at constant volume?
C. N-m
D. N-m^2
68. Which of the following is NOT a value of the standard atmospheric pressure?
A. Constant-pressure gas thermometer
B. Isobaric gas thermometer
A. 1 bar
C. Isometric gas thermometer
B. 1 atm
D. Constant-volume gas thermometer
C. 1 kgf/cm^2
D. 14.223 psi
65. What is the state at which all three phases of water coexist in equilibrium?
69. What is the SI unit of pressure?
A. Tripoint of water
A. Atm
B. Triple point of water
B. Bar
C. Triple phase point of water
C. Pa
D. Phase point of water
D. Psi
66. What is defined as the force per unit area?
70. 1 bar is equivalent to how many pascals?
A. Pressure
A. 10^3
B. Energy
B. 10^4
C. Work
C. 10^5
D. Power
D. 10^6
67. The unit “pascal” is equivalent to ______.
71. 1 atm is equivalent to how many pascals?
A. N/m^2
A. 101,325
B. N/m
B. 101,689
C. 101,102
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D. 101,812
72. What is considered as the actual pressure at a given position and is measured relative to absolute vacuum?
A. Gage pressure
B. Absolute pressure
C. Atmospheric pressure
D. Vacuum pressure
73. What is the pressure below atmospheric pressure called?
C. Aneroid
D. Manometer
76. What instrument is used to measure atmospheric pressure?
A. Pitot tube
B. Wind vane
C. Barometer
D. Manometer
77. Another unit used to measure atmospheric pressure is the “torr”. This is named after the Italian physicist, Evangelista Torrecelli. An average atmospheric pressure is how many torr?
A. Gage pressure
B. Absolute pressure
C. Atmospheric pressure
A. 740
D. Vacuum pressure
B. 750
C. 760
D. 770
74. The difference between the absolute pressure and the atmospheric pressure is called the _____ pressure.
A. Gage
B. Normal
C. Standard
A. Avogadro’s Law
D. Vacuum
B. Amagat Law
C. Pascal’s Law
D. Bernoulli’s Theorem
75. Which of the following is NOT an instrument used to measure pressure?
A. Bourdon tube B. Pitot tube
78. What states that for a confined fluid, the pressure at a point has the same magnitude in all directions?
79. What pressure measuring device consists of a coiled hollow tube that
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tends to straighten out when the tube is subjected to an internal pressure?
83. One calorie is equivalent to how many joules?
A. Aneroid
A. 4.448
B. Manometer
B. 4.184
C. Bourdon pressure gage
C. 4.418
D. Barometer
D. 4.814
80. What is an energy that can be transferred from one object to another causing a change in temperature of each object?
84. One erg is equivalent to how many joules?
A. 10^-8
A. Power
B. 10^-7
B. Heat transfer
C. 10^-6
C. Heat
D. 10^-5
D. Work
81. What is the SI unit of energy?
85. The first law of thermodynamics is the:
A. Law of conservation of momentum
A. Newton
B. Btu
B. Law of conservation of mass
C. Calorie
C. Law of conservation of power
D. Joule
D. Law of conservation of energy
82. One joule is equivalent to one _____.
86. What is the study of energy and its transformations?
A. Kg ∙ m/ s^2
A. Thermostatics
B. Kg ∙ m^2/s^2
B. Thermophysics
C. Kg ∙ m^2/s
C. Thermochemistry
D. Kg ∙ m/s
D. Thermodynamics
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87. What is considered as the heat content of a system?
A. Enthalpy
B. Entropy
C. Internal heat
D. Molar heat
88. What refers to the amount of heat needed to raise the temperature of an object by one degree Celsius or 1K?
A. Heat capacity
B. Specific heat
C. Latent heat
D. Molar heat
89. What is the heat capacity of one mole of substance?
91. “The enthalpy change for any chemical reaction is independent of the intermediate stages, provided the initial and final conditions are the same for each route.” This statement is known as:
A. Dulong’s Law
B. Dalton’s Law
C. Hess’s Law
D. Petit Law
92. What refers to the measure of the disorder present in a given substance or system?
A. Enthalpy
B. Entropy
C. Heat capacity
D. Molar heat
A. Molecular heat
B. Specific heat
A. Joule/Kelvin
C. Latent heat
B. Joule-Meter/Kelvin
D. Molar heat
C. Meter/Kelvin
D. Newton/Kelvin
90. What is the heat capacity of one gram of a substance?
A. Molecular heat
B. Specific heat
C. Latent heat
D. Molar heat
93. Entropy is measured in ______.
94. What is the energy absorbed during chemical reaction under constant volume conditions?
A. Entropy
B. Ion exchange
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C. Enthalpy
C. Superheated
D. Enthalpy of reaction
D. Unsaturated
95. When water exists in the liquid phase and is not about to vaporize, it is considered as _____liquid.
99. A substance that has a fixed chemical composition is known as ______ substance.
A. Saturated
A. Monoatomic
B. Compressed or subcooled
B. Heterogeneous
C. Superheated
C. Homogeneous
D. Unsaturated
D. Pure
96. A liquid that is about to vaporize is called ______ liquid.
A. Saturated
B. Compressed or subcooled
C. Superheated
D. Unsaturated
97. A vapor that is about to condense is called ______ vapor.
A. Saturated
B. Compressed or subcooled
C. Superheated
D. Unsaturated
98. A vapor that is not about to condense is called _____ vapor.
A. Saturated
B. Compressed or subcooled
100. What refers to the temperature at which a pure substance changes phase at a given pressure?
A. Equilibrium temperature
B. Saturation temperature
C. Superheated temperature
D. Subcooled temperature
MCQs Part III 101. What refers to the pressure at which a pure substance changes phase at a given temperature?
A. Equilibrium pressure
B. Saturation pressure
C. Superheated pressure
D. Subcooled pressure
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102. What is the amount of heat needed to turn 1 kg of the substance at its melting point from the solid to liquid state?
C. 333.7 kJ/kg
D. 330.7 kJ/kg
106. What is the latent heat of vaporization of water at 1 atm?
A. Heat of fusion
B. Heat of vaporation
A. 2314.8 kJ/kg
C. Heat of condensation
B. 2257.1 kJ/kg
D. Heat of fission
C. 2511.7 kJ/kg
D. 2429.8 kJ/kg
103. What is the amount of heat needed to turn 1kg of the substance at its boiling point from the liquid to the gaseous state?
A. Heat of fusion
B. Heat of vaporation
C. Heat of condensation
D. Heat of fission
104. What refers to the amount of energy absorbed or released during a phase-change process?
107. What refers to the point at which the saturated liquid and saturated vapor states are the same or identical?
A. Triple point
B. Inflection point
C. Maximum point
D. Critical point
108. What is defined as the direct conversion of a substance from the solid to the vapor state or vice versa without passing the liquid state?
A. Molar heat
B. Latent heat
A. Condensation
C. Vaporization heat
B. Vaporization
D. Condensation heat
C. Sublimation
D. Cryogenation
105. What is the latent heat of fusion of water at 1 atm?
A. 331.1 kJ/kg
B. 332.6 kJ/kg
109. The amount of heat required to raise the temperature of 1kg of water through 1 °C is called ______.
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A. Calorie
B. Joule
C. BTU
A. Vapor ratio
D. Kilocalorie
B. Vapor content
C. Vapor index
D. Quality
110. The amount of heat required to raise the temperature of 1 pound of water by 1°F is called ______.
113. The ratio of the mass of vapor to the total mass of the mixture is called ______.
A. Calorie
B. Joule
C. BTU
A. Pressure and temperature
D. Kilocalorie
B. Pressure, temperature and specific weight
C. Temperature and specific weight
D. Pressure, temperature and specific volume
111. 1 British thermal unit (BTU) is equivalent to how many joules?
A. 1016
B. 1043
C. 1023
D. 1054
112. The term “enthalpy” comes from Greek “enthalpen” which means ______.
A. Warm
B. Hot
C. Heat
D. Cold
114. The “equation of state” refers to any equation that relates the ______ of the substance.
115. In the equation Pv = RT, the constant of proportionality R is known as ______.
A. Universal gas constant
B. Gas constant
C. Ideal gas factor
D. Gas index
116. The gas constant of a certain gas is the ratio of:
A. Universal gas constant to molar mass
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B. Universal gas constant to atomic weight
C. Universal gas constant to atomic number
D. Universal gas constant to number of moles
117. What is the value of the universal gas constant in kJ/kmol ∙ K?
A. 10.73
B. 1.986
C. 8.314
D. 1545
118. The mass of one mole of a substance in grams is known as ______.
A. Molar weight
B. Molar mass
C. Molar volume
D. Molar constant
119. What is defined as the energy required to raise the temperature of a unit mass of a substance by one degree?
A. Latent heat of fusion
B. Molar heat
C. Specific heat capacity
D. Specific heat
120. The ______ of a substance is the amount of heat that must be added or removed from a unit mass of the substance to change its temperature by one degree.
A. Latent heat of fusion
B. Molar heat
C. Specific heat capacity
D. Specific heat
121. What is the specific heat capacity of water in J/kg ∙°C?
A. 4581
B. 4185
C. 4518
D. 4815
122. What is the SI unit of specific heat capacity?
A. J/kg
B. J/kg∙ °F
C. J/kg∙ °C
D. J/°C
123. What is constant for a substance that is considered “incompressible”?
A. Specific volume of density
B. Pressure
C. Temperature
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D. All of the above
124. If there is no heat transferred during the process, it is called a ______ process.
D. Electrification
128. What refers to the transfer of energy between a solid surface and the adjacent fluid that is in motion?
A. Static
A. Conduction
B. Isobaric
B. Convection
C. Polytropic
C. Radiation
D. Adiabatic
D. Electrification
125. The term “adiabatic” comes from Greek “adiabatos” which means ______.
A. No heat
B. No transfer
C. Not to be passed
D. No transformation
126. How is heat transferred?
A. By conduction
B. By convection
C. By radiation
D. All of the above
127. What refers to the transfer of energy due to the emission of electromagnetic waves or photons?
A. Conduction
B. Convection
C. Radiation
129. What refers to the transfer of energy from the more energetic particles of a substance to the adjacent less energetic ones as a result of interaction between particles?
A. Conduction
B. Convection
C. Radiation
D. Electrification
130. What states that the net mass transfer to or from a system during a process is equal to the net change in the total mass of the system during that process?
A. Third law of thermodynamics
B. Conservation of energy principle
C. Second law of thermodynamic
D. Conservation of mass principle
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131. Which of the following statements is TRUE for an ideal gas, but not for a real gas?
A. PV = nRT
B. An increase in temperature causes an increase in the kinetic energy of the gas
C. The total volume of molecules on a gas is nearly the same as the volume of the gas as a whole D. No attractive forces exists between the molecule of a gas
132. How does an adiabatic process compare to an isentropic process?
A. Adiabatic heat transfer is not equal to zero; isentropic heat transfer is zero
B. Both heat transfer = 0; isentropic: reversible
C. Adiabatic heat transfer = 0; isentropic: heat transfer is not equal to zero
D. Both heat transfer is not equal to zero; isentropic: irreversible
133. Which of the following is the Ideal gas law (equation)?
A. V/T = K
B. V= k*(1/P)
C. P1/T1 = P2/T2
D. PV = nRT
134. What is a measure of the ability of a material to conduct heat?
A. Specific heat capacity
B. Coefficient of thermal expansion
C. Coefficient of thermal conductivity
D. Thermal conductivity
135. What refers to the heating of the earth’s atmosphere not caused by direct sunlight but by infrared light radiated by the surface and absorbed mainly by atmospheric carbon dioxide?
A. Greenhouse effect
B. Global warming
C. Thermal rise effect
D. Ozone effect
136. What is a form of mechanical work which is related with the expansion and compression of substances?
A. Boundary work
B. Thermodynamic work
C. Phase work
D. System work
137. Thermal radiation is an electromagnetic radiation with wavelengths in _____ range.
A. 1 to 100 µm
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B. 0.1 to 100 µm
A. Gray body
C. 0.1 to 10 µm
B. Black body
D. 10 to 100 µm
C. Real body
D. White body
138. What refers to the rate of thermal radiation emitter per unit area of a body?
142. At same temperatures, the radiation emitted by all real surfaces is ______ the radiation emitted by a black body.
A. Thermal conductivity
B. Absorptivity
C. Emissivity
A. Less than
D. Emissive power
B. Greater than
C. Equal to
D. Either less than or greater than
139. What states that for any two bodies in thermal equilibrium, the ratios of emissive power to the absorptivity are equal?
A. Kirchhoff’s radiation law
B. Newton’s law of cooling
C. Stefan-Boltzmann law D. Hess’s law
140. What is considered as a perfect absorber as well as a perfect emitter?
A. Gray body
B. Black body
C. Real body
D. White body
141. What is a body that emits a constant emissivity regardless of the wavelength?
143. Which is NOT a characteristic of emissivity?
A. It is high with most nonmetals
B. It is directly proportional to temperature
C. It is independent with the surface condition of the material
D. It is low with highly polished metals
144. What is the emissivity of a black body?
A. 0
B. 1
C. 0.5
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D. 0.25
145. What is the absorptivity of a black body?
A. 0
B. 1
C. 0.5
D. 0.25
146. What is sometimes known as the “Fourth-power law”?
A. Energy conservation
B. Energy equation
C. Energy balance
D. Energy conversion equation
149. What remains constant during a steady-flow process?
A. Mass
B. Energy content of the control volume
A. Kirchhoff’s radiation law
C. Temperature
B. Newton’s law of cooling
C. Stefan-Boltzmann law
D. Mass and energy content of the control volume
D. Hess’s law
147. What states that the net change in the total energy of the system during a process is equal to the difference between the total energy entering and the total energy leaving the system during that process?
A. Third law of thermodynamics
B. Conservation of energy principle
C. Second law of thermodynamics
D. Conservation of mass principle
148. The equation Ein – Eout = ∆Esystem is known as ______.
150. Thermal efficiency is the ratio of:
A. Network input to total heat input
B. Network output to total heat output
C. Network output to total heat input
D. Network input to total heat output
MCQs Part IV 151. What law states that it is impossible to operate an engine operating in a cycle that will have no other effect than to extract heat from a reservoir and turn it into an equivalent amount of work?
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A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
152. Which statement of the second law of thermodynamics states that no heat engine can have a thermal efficiency of 100 percent?
A. Kelvin-Planck statement
B. Clausius statement
C. Kevin statement
D. Rankine statement
153. What is the ratio of the useful heat extracted to heating value?
A. Combustion efficiency
B. Phase efficiency
C. Heat efficiency
D. Work efficiency
154. What is defined as the ratio of the net electrical power output to the rate of fuel energy input?
155. What refers to the amount of heat removed from the cooled space in BTS’s for 1 watt-hour of electricity consumed?
A. Cost efficiency rating
B. Energy efficiency rating
C. Coefficient of performance
D. Cost of performance
156. What law states that it is impossible to build a device that operates in a cycle and produces no effect other than the transfer of heat from a lowertemperature body to a highertemperature body?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
157. What statement of the second law of thermodynamics states that it is impossible to build a device that operates in a cycle and produces no effect other than the transfer of heat from a lower-temperature body to a higher-temperature body?
A. Combustion efficiency
A. Kelvin-Planck statement
B. Thermal efficiency
B. Clausius statement
C. Overall efficiency
C. Kelvin statement
D. Furnace efficiency
D. Rankine statement
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158. A device that violates either the first law of thermodynamics or the second law of thermodynamics is known as _____.
A. Ambiguous machine
B. Universal machine
C. Perpetual-motion machine
D. Unique machine
159. A device that violates the first law of thermodynamics is called a _____.
A. Perpetual-motion machine of the first kind
B. Universal machine of the first kind
C. Ambiguous machine of the first kind
D. Unique machine of the first kind
160. A device that violates the second law of thermodynamics is called a ______.
161. Carnot cycle is the best known reversible cycle which was first proposed in what year?
A. 1842
B. 1824
C. 1832
D. 1834
162. Who proposed the Carnot cycle?
A. Sammy Carnot
B. Sonny Carnot
C. Sadi Carnot
D. Suri Carnot
163. The Carnot cycle is composed of how many reversible processes?
A. 2
B. 3
C. 4
D. 5
A. Perpetual motion machine of the second kind
B. Universal machine of the second kind
A. One isothermal and one adiabatic
C. Ambiguous machine of the second kind
B. One isothermal and two adiabatic
D. Unique machine of the second kind
C. Two isothermal and one adiabatic
164. The Carnot cycle is composed of ______ processes.
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D. Two isothermal and two adiabatic
165. What is the highest efficiency of heat engine operating between the two thermal energy reservoirs at temperature limits?
A. Ericson efficiency
B. Otto efficiency
C. Carnot efficiency
D. Stirling efficiency
166. What is a heat engine that operates on the reversible Carnot cycle called?
168. Who discovered the thermodynamic property “Entropy” in 1865?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
169. A process during which entropy remains constant is called ______ process
A. Isometric
A. Carnot heat engine
B. Isochoric
B. Ideal heat engine
C. Isobaric
C. Most efficient heat engine
D. Isentropic
D. Best heat engine
167. What states that thermal efficiencies of all reversible heat engines operating between the same two reservoirs are the same and that no heat engine is more efficient than a reversible one operating between the same two reservoirs?
A. Ericson principle
B. Carnot principle
C. Otto principle
D. Stirling principle
170. “A reversible adiabatic process is necessarily isentropic but an isentropic process is not necessarily reversible adiabatic process.” This statement is:
A. True
B. False
C. May be true and may be false
D. Absurd
171. The term “isentropic process” used in thermodynamics implies what?
A. Reversible adiabatic process
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B. Externally reversible, adiabatic process
C. Internally reversible, adiabatic process
D. Irreversible adiabatic process
172. What states that the entropy of a pure crystalline substance at absolute zero temperature is zero?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
173. What law provides an absolute reference point for the determination of entropy?
C. Entropy balance relation
D. Third law of thermodynamics
175. What law states that entropy can be created but it cannot be destroyed?
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Third law of thermodynamics
176. Entropy is transferred by ______.
A. Work
B. Heat
C. Energy
D. Work and heat
A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
A. It is temperature-dependent
D. Third law of thermodynamics
B. It is always greater than zero
C. It is always zero
D. It is always less than zero
174. “The entropy change of a system during a process is equal to the net entropy transfer through the system boundary and the entropy generated within the system”. This statement is known as:
A. Entropy generation
B. Entropy change of a system
177. During adiabatic, internally reversible process, what is true about the change in entropy?
178. Water boils when:
A. Its saturated vapor pressure equals to the atmospheric pressure
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B. Its vapor pressure equals 76cm of mercury
C. Its temperature reaches 212 degree Celsius
D. Its vapor pressure is 1 gram per sq. cm
179. Which of the following is standard temperature and pressure (STP)?
A. 0 degree Celsius and one atmosphere
C. Gay-Lussac Law
D. Ideal gas law
182. Which of the following is the mathematical representation of the Charles’s law?
A. V1/V2= P2/P1
B. V1/T1=V2/T2
C. V1/T2=V2/T1
D. V1/V2=√P2/√P1
B. 32 degree Fahrenheit and zero pressure
C. 0 degree Kelvin and one atmosphere
A. Thickness of material/ thermal conductivity of material
D. 0 degree Fahrenheit and zero pressure
180. What is the value of the work done for a closed, reversible isometric system?
B. 2(thickness of material)/thermal conductivity of material
C. Thickness of material/ 2(thermal conductivity of material)
D. Thickness of material x thermal conductivity of material
A. Zero
B. Positive
C. Negative
D. Positive or negative
181. “At constant pressure, the volume of a gas is inversely proportional to the pressure”. This is known as ______.
183. Which of the following is the formula for thermal resistance?
184. In the process of radiation, energy is carried by electromagnetic waves. What is the speed of electromagnetic waves?
A. 182,000 miles/second
A. Boyle’s Law
B. 184,000 miles/second
B. Charles’s Law
C. 186,000 miles/second
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D. 188,000 miles/second
A. Third law of thermodynamics
185. For heat engine operating between two temperatures (T1>T2), what is the maximum efficiency attainable?
B. Law of Dulong and Petit
C. Mollier diagram
D. Pressure-enthalpy diagram
A. Eff = 1 – (T2/T1)
B. Eff = 1 - (T1/T2)
C. Eff = T1 - T2
D. Eff = 1 - (T2/T1)^2
186. Which one is the correct relation between energy efficiency ratio (EER) and coefficient of performance (COP)?
A. EER = 2.34 COP
B. EER = 3.24 COP
C. EER = 3.42 COP
D. EER = 4.23 COP
187. The coefficient of performance (COP) is the ratio between the:
A. Power consumption in watts and heat absorbed per hour B. Heat absorbed per hour and the power consumption in watts C. Work required and the absorbed heat
189. Considering one mole of any gas, the equation of state of ideal gases is simply the ______ law.
A. Gay-Lussac law
B. Dulong and Petit
C. Avogadro’s
D. Henry’s
190. An ideal gas whose specific heats are constant is called _____.
A. Perfect gas
B. Natural gas
C. Artificial gas
D. Refined gas
191. What are the assumptions of the kinetic gas theory?
A. Gas molecules do not attract each other
B. The volume of the gas molecules is negligible compared to the volume of the gas
C. The molecules behave like hard spheres
D. Absorbed heat and work required
188. What predicts the approximate molar specific heat at high temperatures from the atomic weight?
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D. All of the above
192. “The total volume of a mixture of non-reacting gases is equal to the sum of the partial volumes.” This statement is known as ______.
A. Law of Dulong and Petit
B. Maxwell-Boltzmann law
C. Amagat’s law
D. Avogadro’s law
193. An adiabatic process in which there is no change in system enthalpy but for which there is a significant decrease in pressure is called _____.
B. Heel reservoir
C. Toe reservoir
D. Sink reservoir
196. A ______ is a flow in which the gas flow is adiabatic and frictionless and entropy change is zero.
A. Isentropic flow
B. Isobaric flow
C. Steady flow
D. Uniform flow
197. What refers to the minimum temperature at which combustion can be sustained?
A. Isochoric process
B. Isobaric process
A. Burn temperature
C. Throttling process
B. Kindle temperature
D. Quasistatic process
C. Spark temperature
D. Ignition temperature
194. What is defined as the ratio of the change in temperature to the change in pressure when a real gas is throttled?
A. Rankine coefficient
B. Kelvin coefficient
C. Maxwell-Boltzmann coefficient
D. Joule-Thomson coefficient
195. The low temperature reservoir of the heat reservoirs is known as ______.
A. Source reservoir
198. What law predicts the dew point of moisture in the fuel gas?
A. Dalton’s law
B. Law of Dulong and Petit
C. Ringelman law
D. Amagat’s law
199. What law states that one energy from can be converted without loss into another form?
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A. Amagat’s law
c. Fahrenheit
B. Joule’s law
d. Rankine
C. Lussac’s law
D. Henry’s law
200. Which is NOT a correct statement?
A. A superheated vapor will not condense when small amount of heat re removed B. An ideal gas is a gas that is not a superheated vapor
C. A saturated liquid can absorb as much heat as it can without vaporizing
D. Water at 1 atm and room temperature is subcooled
MCQs Part V 201. Thermodynamics is the study of heat and its transformation which stems from Greek words meaning _________.
a. transformation of heat
b. transformation of energy
c. movement of heat
d. movement of matter
202. What is the Si unit for temperature?
a. Kelvin
b. Celsius
203. The energy that flows from higher temperature object to a lower temperature object because of the difference in temperature is called
a. heat
b. temperature
c. thermodynamics cycle
d. energy flow
204. The amount of heat energy per kilogram that must be added or removed when a substance changes from one phase to another.
a. specific heat
b. heat of expansion
c. latent heat
d. useful heat
205. The change in physical size of a substance when its temperature changes.
a. intensive property
b. extensive property
c. volume expansion
d. thermal expansion
206. A stress which develops within an object when it attempts to expand or
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contract in response to a temperature changes, but cannot, due to being held rigidly in place.
a. elongation
b. thermal stress
c. expansion contraction
d. thermal expansion
207. The energy associated with individual molecules in a gas, liquid or solid.
c. Specific Pressure
d. Equilibrium Phase Pressure
210. Vapor pressure depends only on _________.
a. pressure
b. force
c. volume
d. temperature
211. A plot of pressure vs. temperature for a given substance showing the various phases possible for that particular substance.
a. Specific Energy
b. Molecular Energy
c. Internal Energy
a. Phase diagram
d. Phase Energy
b. P-T diagram
c. Wein Diagram
d. Histogram
208. The heat Q per unit mass per degree change in temperature that must be supplied or removed to change the temperature of a substance.
212. _________ is the grand total of all energies inside a substance.
a. Specific Heat Capacity
b. Latent Heat
a. Internal Energy
c. Heat of Transformation
b. Grand Energy
d. Internal Heat
c. Atomic Energy
d. Elemental Energy
209. The pressure of the vapor phase of a substance that is in equilibrium with the liquid or solid phase.
a. Phase Pressure
b. Equilibrium Vapor Pressure
213. The _________ is defined as the amount of heat required to change the temperature of 1 gram of water by 1 Celsius degree.
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a. specific heat
b. latent heat
c. Joule
d. calorie
214. _________ is a measure of the average kinetic energy per molecule in a substance.
a. movement
b. temperature
c. heat
d. mass
215. _________ the very small KE still present in molecules at absolute zero temperature.
a. internal KE
b. Atomic kinetic energy
c. Zero-Point Energy
d. Subliminal Energy
216. Convert the change of temperature from 20˚C to 30˚C to Kelvin scale.
217. _________ is a thermodynamic potential which measures the “useful” work obtainable from a closed thermodynamic system at a constant temperature and volume.
a. useful work
b. energy consumed
c. Helmholtz free energy
d. Kinetic Energy
218. How much will the length of a 1.0 km section of concrete highway change if the temperature varies from -15˚C in winter to 41˚C in summer?
a. 0.67 m
b. 2.2 m
c. 3.1 m
d. 0.47 m
219. Two 12 ft. sections of aluminum siding are placed end to end on the outside wall of house. How large a gap should be left between the pieces to prevent buckling if the temperature can change by 55˚C?
a. 10 K
a. 0.21 m
b. 293 K
b. 0.18 m
c. 303 K
c. 0.31 in
d. 273 K
d. 0.18 in
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square meter that is at right angles to the sun’s rays at the top of the atmosphere?
a. 1400 J
b. 6000 J
c. 10000 J
d. 800 J
221. _________ is a thermodynamic potential that measures the “useful” or process-initiating work obtainable from an isothermal, isobaric thermodynamic system.
b. relative humidity
c. absolute pressure
d. vapor pressure
224. _________ is the transition of a given substance from the solid to the gas phase with no intermediate liquid stage.
a. Convection
b. Conduction
c. Radiation
d. Sublimation
a. Du-Pont Potential
b. Gibbs free energy
c. Rabz-Eccles Energy
a. Convection
d. Claussius Energy
b. Conduction
c. Radiation
d. Sublimation
222. All the energy we consume ultimately becomes _________.
a. heat
b. depleted
c. exhausted
d. work
223. _________is the partial pressure of water vapor at the existing temperature divided by the equilibrium vapor pressure of water at the existing temperature.
225. A process in which heat energy is transferred by the flow of fluid.
226. In order to use a substance to make a thermometer the substance must _________ with a temperature change.
a. expand
b. contract
c. change
d. increase
a. vacuum pressure
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227. For most solids, the coefficient of volume expansion is _________ the coefficient of linear expansion.
a. unrelated to
b. proportional to
c. twice
d. three times
228. The volume of a given amount of water _________ as the temperature decreases from 4˚C to 0˚C.
c. the relative humidity remains constant
d. the air would eventually become saturated
231. The flow of a fluid when heat is transferred by convection.
a. placidity
b. mass flow
c. convection current
d. heat transfer
a. decreases
b. increases
c. remains constant
a. elastic material
d. none of the above
b. transponder material
c. Teflon
d. blackbody
229. The gas in a constant gas thermometer cooled to absolute zero would have _________.
232. An idealized perfect absorber and perfect emitter of radiation.
233. A process by which heat is transferred through a material without a bulk movement of the material.
a. no volume
b. no pressure
c. zero temperature at all scales
a. Convection
d. none of the above
b. Conduction
c. Radiation
d. Emission
230. On a day when the partial pressure of water vapor remains constant, what happens as the temperature rises?
a. the relative humidity increases
b. the relative humidity decreases
234. Is the amount of a substance that contains Avogadro’s number of atoms/molecules.
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a. mass
b. matter
c. gram-mole
a. path function
d. volume
b. point function
c. process
d. cycle
235. The distribution of particle speeds in an ideal gas at a given temperature.
a. velocity of propagation
b. escape velocity
c. Maxwell speed Distribution
d. terminal velocity
236. A convection process in which an external device, such as a fan, is used to produce the fluid flow.
238. A _________ is a quantity whose value depends on the path followed during a particular change in state.
239. The contact surface shared by both the system and the surroundings is called _________.
a. wall
b. boundary
c. interface
d. intersection
a. Forced Convection
b. External Convection
c. Placid Convection
a. isolated system
d. Thermionic Convection
b. closed container
237. A _________ is a quantity whose value at any state is independent of the path or process used to reach that state.
c. control mass
d. control volume
a. cycle
b. path function
c. point function d. process
240. A closed system is also known as _________.
241. Open system is also known as _________.
a. isolated system
b. closed container
c. control mass
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d. control volume
242. Liquid hydrogen boils at 17 K. What is the temperature in degrees Celsius?
c. type of material
d. shape of the object
246. Which of the following have the highest thermal conductivities?
a. 290
b. 63
a. liquids
c. -120
b. gases
d. -256
c. metals
d. solids other than metals
243. When a solid melts,
a. the temperature of the substance increases.
b. the temperature of the substance decreases.
c. heat leaves the substance.
a. aluminium
d. heat enters the substance.
b. brass
c. glass
d. concrete
244. How many kilocalories of heat are required to heat 750 g of water from 35˚C to 55˚C.
a. 15
b. 1500
c. 1.5 x 10^4
d. 6.3 x 10^4
245. Which of the following does not determine the amount of internal energy an object has?
a. temperature
b. amount of material
247. Identical objects of four different materials are heated to the same high temperature. Which of the following would least likely burn your hand if touched?
248. As we heat a gas at constant pressure, its volume
a. increases
b. decreases
c. stays the same
d. none of the above
249. The volume of an ideal gas is directly proportional to its
a. pressure
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b. Celsius temperature
c. Kelvin temperature
d. Fahrenheit temperature
250. An ideal gas is maintained at constant temperature. If the pressure on the gas is doubled, the volume is
a. increased fourfold
b. doubled
c. reduced by half
d. decreased by a quarter
MCQs Part VI 251. If the Kelvin temperature of an ideal gas is doubled, what happens to the rms speed of the molecules in the gas?
a. it increases by a factor of square root of 2
b. it increases by a factor of 2
c. it increases by factor of 4
d. none of the above
252. A function of state that is associated with disorder in the system and environment.
d. Lenz’ Law
253. No volume changes occur during this type of process
a. Isobaric process
b. Isomillimetric process
c. Isocaloric process
d. Isochoric process
254. The boiling of water into steam in an open container is an example of a/an _________ process.
a. adiabatic
b. isochoric
c. isobaric
d. zero work
255. When liquid water is converted to steam at 100˚C, the entropy of water
a. increases
b. decreases
c. remains the same
d. none of the above
256. Only energy can cross the boundaries.
a. enthalpy
a. Closed system
b. entropy
b. Open system
c. law of diminishing return
c. Isolated system
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d. Isoenergetic system
257. The temperature at which the vapor pressure exactly equals one atm is called _________.
a. boiling temperature
b. normal boiling point
c. triple point
d. point of infliction
258. Mixture of liquid and steam of the same substance in which both are at saturation temperature.
a. dry steam
b. current steam
c. wet steam
d. aerosol
259. The term _________ is traditionally used to describe steam issuing from condensate receiver vents and openended condensate discharge lines from steam traps.
a. dry steam
b. wet steam
c. phase steam
d. flash steam
260. Defined as the ratio of weight of dry steam to the weight of stuff.
b. Vaporization
c. fusion
d. super heated steam
261. What device measures infrared radiation below?
a. thermocouple
b. thermopile
c. thermodynamic device
d. thermos
262. When an object undergoes thermal expansion,
a. any holes in the object expand as well
b. any holes in the object remain the same
c. mass increases
d. molecular activities would cease
263. _________ is the quantity of heat required to raise the temperature of one pound of water 1 F˚ from 63 ˚F to 64 ˚F.
a. one Joule
b. one calorie
c. one watt
d. one BTU
a. dryness fraction
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264. Boiling temperature of a material is dependent on its _________.
a. volume
b. power
c. heat
d. pressure
265. Thermos was invented by _________.
a. Sir Arthur Conan Doyle
b. Sir Fredrich the Great
c. Thomas Edison
d. Sir James Dewar
266. Most cooking activities involve _________ process.
a. Isochoric
b. Isothermal
c. Isobaric
d. Isovolumic
267. Adiabatic heating and Adiabatic cooling really means _________ and _________ respectively.
a. raising the temp and lowering the temp
b. maintaining the pressure and changing the temperature
c. decreasing the volume and increasing the pressure
d. lowering the temp and raising the temp
268. The statement “heat cannot by itself flow from one body into a hotter body” is governed by _________.
a. the first law of thermodynamics
b. the second law of thermodynamics
c. the third law of thermodynamics
d. the zeroth law of thermodynamics
269. It is impossible for any process to have as its sole result the transfer of heat from a cooler to a hotter body
a. Carnot’s statement
b. Clausius statement
c. Rankine statement
d. Gauss statement
270. _________ is the average distance a molecule moves before colliding with another molecule.
a. mean free path
b. path allowance
c. compacting factor
d. molecular space
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271. Find the pressure due to a column of mercury 74.0 cm high.
c. Newton’s Second law
d. Pascal’s law
a. 91.80 x 10^3 N/m^2
b. 73.56 x 10^2 N/m^2
c. 9.86 x 10^4 N/m^2
a. Atmospheric Pressure
d. 87.2 x 10^4 N/m^2
b. Gauge Pressure
c. Surface Pressure
d. Isobaric Pressure
272. Roughly what is the total weight of air in the entire earth?
275. What type of pressure cannot be used for Boyle’s Law?
a. 1 x 10^5 tons
b. 2 x 10^6 tons
c. 6 x 10^15 tons
a. 62.4 lb
d. 8 x 10^10 tons
b. 9.81 lb
c. 76 lb
d. 760 lb
273. _________ is defined as that equivalent to the pressure due to a column of mercury 76cm long.
276. To displace a cubic foot of fresh water, you need _________ force.
277. The force per unit length across such a line in the surface is called _________.
a. surface pressure
b. gage pressure
c. standard atmospheric pressure
a. force per length
d. isobaric pressure
b. surface tension
c. Pressure
d. Density
274. If any external pressure is applied to a confined fluid, the pressure will be increased at every point in the fluid by the amount of the external pressure is known as _________.
a. Torricelli’s law
b. Barometric law
278. The speed at which a liquid escapes from a vessel through an orifice is given by _________.
a. Archimedes Principle
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b. Evangelista’s Law
c. Torricelli’s Theorem
d. Bernoulli’s Equation
279. The process of one substance mixing with another because of molecular motion is called _________.
a. diffusion
b. viscosity
c. streamline flow
d. solution
280. When was the Ninth General Conference on Weights and Measures decided to abandon centigrade and used Celsius Instead?
a. 1950
b. 1936
c. 1957
d. 1948
281. _________ is the temperature to which the air must be cooled, at constant pressure, to produce saturation.
a. relative humidity
b. triple point temperature
c. dew point
d. critical point
282. _________ is a succession of changes that ends with the return of the body or system to its initial state.
a. process
b. system
c. equilibrium
d. cycle
283. Intensive properties of a system are called _________.
a. Bulk Properties
b. Innate Properties
c. Natural Properties
d. Inside Properties
284. In thermodynamics, a throttling process, also called a _________, is a type of isenthalpic process where a liquid or gas is cooled as it passes from a higher pressure state to a lower pressure state.
a. Rankine Process
b. Carnot Cycle
c. Joule-Thomson process
d. Refrigeration process
285. Gasoline and Diesel Engines are best described by the _________.
a. Otto Cycle
b. Burnign Cycle
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c. Shikki Cycle
d. Shapa R’ Elli Cycle
286. Twenty grams of ice at 0˚C melts to water at 0˚C. How much does the entropy of the 20g change in this process?
289. A gas is enclosed in a cylinder with a weighted piston as the top boundary. The gas is heated and expands from a volume of 0.04 m3 to 0.10 m3 at a constant pressure of 200 kPa. Find the work done on the system.
a. 5 kJ
a. 30.5 J/K
b. 15 kJ
b. 24.6 J/K
c. 10 kJ
c. 21.3 J/K
d. 12 kJ
d. 15.7 J/K
287. The first law of thermodynamics is based on which of the following principles?
a. conservation of mass
b. the enthalpy-entropy relationship
c. action – reaction
d. conservation of energy
288. If a system absorbs 500 cal of heat at the same time does 400J of work, find the change in internal energy of the system.
290. A simple steam engine receives steam from the boiler at 180˚C and exhausts directly into the air at 100˚C. What is the upper limit of its efficiency?
a. 11.28 %
b. 36.77 %
c. 20.36 %
d. 17.66 %
291. Heat which causes a change in temperature of a substance.
a. Latent heat
b. Sensible heat
a. 1400 J
c. Specific heat
b. 1700 J
d. Heat of Fusion
c. 1900 J
d. 1500 J
292. Who coined the term latent heat?
a. John Thompson
b. Studey Baker
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c. Joe di Maggio
a. Polytropic process
d. Joseph Black
b. Entropy
c. Ideal Gas Law
d. Carnot Cycle
293. Which of the following cannot be measured by a thermometer?
a. Latent Heat
b. Sensible Heat
c. Specific Heat
d. Heat of Fusion
294. It is generally accepted as a law of nature that although one may closely approach 0 Kelvin it is impossible actually to reach it.
297. The flow through an open system is _________ if all properties at each point within the system remain constant with respect to time.
a. streamline flow
b. steady flow
c. constant flow
d. algebraic flow
a. First Law of thermodynamics
b. Second Law of thermodynamics
c. Third Law of thermodynamics
a. Otto Cycle
d. Zeroth Law of thermodynamics
b. Lazare Cycle
295. One calorie is equal to _________.
c. Isothermal Cycle
d. Carnot Cycle
a. 1/180 W.h
b. 1/860 W.h
c. 1/360 W.h
d. 1/250 W.h
296. A _________ is a reversible process in which there is transfer of heat and takes place according to the relation pVn = C where n is any constant.
298. The most efficient cycle that can operate between two constant temperature reservoir is the _________.
299. The flow energy of 150 L of a fluid passing a boundary to a system is 110 kJ. Determine the pressure at this point
a. 733.33 kPa
b. 833.33 kPa
c. 933.33 kPa
d. 633.33 kPa
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300. Who is the father of thermodynamics?
Formula: h= u+ pV u= h– pV 303. 3.0 lbm of air are contained at 25 psia and 100 ˚F. Given that Rair = 53.35 ft-lbf/lbm- ˚F, what is the volume of the container?
a. Lazare Carnot
b. Sadi Carnot
c. William Thompson
A.10.7 ft^3
d. Rudolf Classius
B.14.7 ft^3
C.15 ft^3
D.24.9 ft^3
MCQs Part VII 301. If air is at pressure, p, of 3200 lbf/ft2, and at a temperature, T, of 800 ˚R, what is the specific volume, v? (R=5303 ft-lbf/lbm-˚R, and air can be modeled as an ideal gas.)
A.9.8 ft^3/lbm
B.11.2 ft^3/lbm
C.13.33 ft^3/lbm
D.14.2 ft^3/lbm
Formula: pv = RT v = RT / p 302. Steam at 1000 lbf/ft^2 pressure and 300˚R has specific volume of 6.5 ft^3/lbm and a specific enthalpy of 9800 lbf-ft/lbm. Find the internal energy per pound mass of steam.
A.2500 lbf-ft/lbm
B.3300 lbf-ft/lbm
C.5400 lbf-ft/lbm
D.6900 lbf-ft/lbm
Formula: use the ideal gas law pV = mRT T = (100 +460) ˚R V = mRT/p 304. The compressibility factor, x, is used for predicting the behavior of nonideal gases. How is the compressibility ty factor defined relative to an ideal gas? (subscript “c”refers to critical value)
A. z = P / Pc
B. z = pV/ RT
C. z = T /Tc
D. z = RT / pV
Hint: for an real gases the compressibility factor, x, is an dimensionless constant given by pV= zRT. Therefore z = pV / RT 305. From the steam table, determine the average constant pressure specific heat (c) of steam at 10 kPa and45.8 ˚C
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A.1.79 kJ/ kg-˚C
B.10.28 kJ/ kg-˚C
C.30.57 kJ/ kg-˚C
D. 100.1 kJ/ kg-˚C
Formula: ∆h = c∆T From the steam table
steam table, calculate the mass of the water vapor.
A. 0.99kg
B. 1.57 kg
C. 2.54 kg
D. 3.16 kg
At 47.7 ˚C h= 2588.1 kJ/ kg
Formula: from the steam table at 600kPa
At 43.8 ˚C h= 2581.1 kJ/ kg
vƒ = 0.001101 m^3 / kg
306. A 10m^3 vessel initially contains 5 m^3 of liquid water and 5 m^3 of saturated water vapor at 100 kPa. Calculate the internal energy of the system using the steam table.
vg = 0.3157 m^3 / kg
A. 5 x10^5 kJ
B. 8x10^5 kJ
C. 1 x10^6 kJ
D. 2 x10^6 kJ
Formula: fromthe steamtable
Vtot = mƒ vƒ + mg vg mg = (tot-mƒ vƒ) / vg 308. Calculate the entropy of steam at 60psiawith a quality of 0.8
A. 0.4274 BTU/lbm-˚R
B. 0.7303 BTU/lbm-˚R
C. 1.1577 BTU/lbm-˚R
D. 1.2172 BTU/lbm-˚R
vƒ = 0.001043 m^3 / kg
Formula: fromthe steamtable at 60 psia:
vg = 1.6940 m^3 / kg
sƒ = 0.4274 BTU/lbm-˚R
u ƒ= 417.3 kJ/kg ug= 2506kJ/kg
sƒg = 1.2172 BTU/lbm-˚R)
formula: Mvap = V vap/vg
s = sƒ + x sƒg where x = is the quality
M liq = Vliq/ vƒ
309. Find the change in internal energy of 5 lb. of oxygen gas when the temperature changes from 100 ˚F to 120 ˚F. CV = 0.157 BTU/lbm-˚R
u =uƒM liq + ug M vap 307. A vessel with a volume of cubic meter contains liquid water and water vapor ion equilibrium at 600 kPa. The liquid water has mass of1kg. Using the
A.14.7 BTU
B.15.7 BTU
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C. 16.8 BTU
D. 15.9 BTU
Formula: ∆U= mcv∆T 310. Water (specific heat cv= 4.2 kJ/ kg ∙ K ) is being heated by a 1500 W h eater. What is the rate of change in temperature of 1kg of the water?
A. 0.043 K/s
B. 0.179 K/s
C. 0.357 K/s
D. 1.50 K/s
Formula: Q = mcv (∆T) 311. A system weighing 2kN. Determine the force that accelerate if to 12 m/s^2. a. vertically upward when g = 9.7 m/s^2
D. 2374.23 N
Formula : M = wk / g F = ma /k 313. A problem Drum ( 3 ft. diameter ; 6 ft. height ) is field with a fluid whose density is 50 lb/ft^3. Determine the total volume of the fluid.
A. 42.41 ft^3
B.44.35 ft^3
C.45.63 ft^3
D.41.23 ft^3
Formula: Vf = (pi d^2 h) / 4 314. What is the resulting pressure when one pound of air at 15 psia and 200 ˚F is heated at constant volume to 800 ˚F?
A. 4474.23 N
B.5484.23 N
A.15 psia
C.4495.23 N
B. 28.6 psia
D.5488.23 N
C. 36.4 psia.
D. 52.1 psia
Formula: F = m/k (a +g) 312. Refer to problem # 11. Determine the force that accelerates if to 12 m/s^2. horizontally along frictionless plane.
A. 2474.23 N
B. 2574.23 N
C. 3474.23 N
Formula : T1/p1 = T2/p2 p2= p1T2 / T1 315. What horse power is required to isothermally compress 800 ft^3 of Air per minute from 14.7 psia to 120 psia?
A. 28 hp
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B.108 hp
C.256 hp
D.13900 hp
Formula: W= p1V1 ln (p1/p2) Power = dW / dt 316. What is the equation for the work done by a constant temperature system?
A. W = mRTln(V2-V1)
B. W = mR( T2-T1 ) ln( V2/V1)
C. W = mRTln (V2/V1)
D. W = RT ln (V2/V1)
and 68 ˚F. The compression ratio is 1:4. Calculate the work done by the gas.
A. –1454 BTU/lbm
B. -364 BTU/lbm
C.-187BTU/lbm
D.46.7 BTU/lbm
Formula: W = RT ln (V2/V1) 319. Gas is enclosed in a cylinder with a weighted piston as the stop boundary. The gas is heated and expands from a volume of 0.04 m^3 to 0.10 m^3 at a constant pressure of 200kPa.Calculate the work done by the system.
Formula : W=∫ pdV lim1,2
A. 8 kJ
∫ = mRT / V
B. 10 kJ
C.12 kJ
D.14 kJ
317. Twenty grams of oxygen gas are compressed at a constant temperature of 30 ˚C to 5%of their original volume. What work is done on the system.
Formula: W = p(V2-V1)
A.824 cal
B.924 cal
C.944 cal
A. 0.02 ft^3/lbm
D.1124 cal
B. 0.05 ft^3/lbm
C. 1.0 ft^3/lbm
D. 1.2 ft^3/lbm
Formula: W = -mRTln (V2/V1) Where R = (1.98 cal/gmole·K) (32 g/gmole) 318. Helium ( R= 0.4698 BTU/lbm-˚R ) is compressed isothermally from 14.7 psia
320. refer to problem no.13. Determine the specific volume.
Formula : Vf = ( pi d^2 h) / 4 Pf = mf / vf
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Specific volume= Vf /mf
b. 543.68 kPa (gauge)
321. What is the weight of a66-kgm man at standard condition?
c. Both a & b
(Formula: Fg= mg / k)
d. None of the above
a. 66 kgf
b. 66 kgm
c. 66 lbm
d. 66 gf
325. Ten cu ft. of air at 300 psia 400°F is cooled to 140°F at constant volume. What is the final pressure? (formula: p2 = p1T2/T1)
322. What is the specific weight of water at standard condition? (Formula: γ = ρg / k)
a. 1000 kgm/m3
b. 9.8066 m/s
c. 1000 kgf/m
d. None of the above
a. 0
b. 209 psia
c. - 420 psia
d. None of the above
326. 876 °R = _____ °F
2
a. 335
b. 416
c. 400
d. None of the above
3
323. 746 °R = ______ °F
a. 254
b. 345
c. 286
d. None of the above
324. A 30-m vertical column of fluid (density 1878 kg/m3 ) is located where g= 9.65 mps2. Find the pressure at the base of the column. (Formula: pg= gρhg/k )
a. 543680 N/m
327. There are 1.36 kg of gas, for which R = 377 J/kg.k and k = 1.25, that undergo a nonflow constant volume process from p1 = 551.6 kPa and t1 = 60°C to p2 = 1655 kPa. During the process the gas is internally stirred and there are also added 105.5 kJ of heat. Determine t2. (Formula: T2= T1p2/ p1)
a. 999 K
b. 888 K
2
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c. 456 K
a. 214
d. One of the above
b. 121
c. 213
d. None of the above
328. 5 atm = ____mmHg
a. 8300
b. 3800
c. 3080
a. 200
d. None of the above
b. 150
c. 100
d. None of the above
329. A certain gas, with cp = 0.529Btu/lb.°R and R = 96.2 ft.lb/lb.°R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5 psia. Compute for T2. (Formula: T2= T1V2/V1)
332. 212 °F = _____ °C
333. Let a closed system execute a state change for which the heat is Q = 100 J and work is W = -25 J. Find ∆E. (Formula: ∆E = Q- W)
a. 460°R
b. 270°R
a. 125 J
c. 1620 °R
b. 123 J
d. None of the above
c. 126 J
d. None of the above
330. In the above problem, compute for the mass. (Formula: m = p1V1 / RT1)
a. 0.2148 lb
b. 0.2134 lb
c. 0.1248 lb
d. None of the above
331. 710°R= ______ °C
334. A pressure gage registers 50 psig in a region where the barometer is 14.25 psia. Find absolute pressure in psia, Pa. (Formula; p = patm+ pg)
a. 433 kPa
b. 443 kPa
c. 343 kPa
d. None of the above
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335. A mass of 5kg is 100m above a given datum where local g = 9.75 m/s2. Find the gravitational force in newtons.
b. 1
c. 350
(Formula: Fg= mg/k )
d. None of the above
a. 48.75 N
b. 50 N
a. 485
c. 45 N
b. 435
d. None of the above
c. 498
336. In the above problem, find the potential energy of the mass with respect to datum.
d. None of the above
(Formula: P = mgz/k )
a. 4875 j
b. 0.51 j
c. 0.46 j
d. None of the above
337. The combined mass of car and passengers travelling at 72 km/hr is 1500 kg. Find the kinetic energy of this combined mass. (Formula: K =mv / 2k )
339. 212 °C = _____ K
340. 212 °F = _____R
a. 567
b. 672
c. 700
d. None of the above
341. An automobile tire has a gauge pressure of 200 kpa at 0°C assuming no air leaks and no change of volume of the tire, what is the gauge pressure at 35ºC.
a. 298.645
b. 398.109
c. 291.167
d. 281.333
2
a. 300 kJ
b. 200 kJ
c. 500 kJ
d. None of the above
338. 14.696 psia = _____ mmHg
Pg = Pabs - Patm 342. An ideal gas at 45psig and 80ºF is heated in the close container to 130ºF. What is the final pressure?
a. 760
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a. 65.10 psi
c. 981.6 N
b. 65.11 psi
d. 980.1N
c. 65.23 psi
F = ma
d. 61.16 psi
P1V1/T1= P2V2/T2;V = Constant 343. A wall of the firebrick has an inside temperature of 313ºF and an outside temperature of 73ºF. What is the difference in the surface temperature in Rankin?
a. 70
b. 68
c. 72
d. 94
ºR = ºF + 460 344. What is the force required to accelerate amass of 30kg at a rate of 15m/s².
346. The volume of the gas held at constant pressure increases 4 cm² at 0°C to 5cm². What is the final pressure?
a. 68.65ºC
b. 68.25ºC
c. 70.01°C
d. 79.1ºC
t2= T2–T1 347. A certain gas with cp = 0.529Btu/lb°R and R = 96.2ft/lbºR expands from 5 ft and 80ºF to 15 ft while the pressure remains constant at 15.5 psia.
a. T2=1.620ºR, ∫H = 122.83 Btu
b. T2 = 2°R, ∫H = 122.83 Btu
a. 460 N
c. T2 = 2.620ºR, ∫H = 122.83 Btu
b. 380 N
d. T2 = 1°R, ∫H = 122.83 Btu
c. 560 N
d. 450 N
F = ma 345. How much does an object having the mass of 100kg weight in newton.
a. 981 N
b. 991 N
T2= V2(t2)/V1 and ∫H = mcp (T2-T1) 348. A vacuum is connected to a tank reads 3kpa at a location w/ the barametric pressure reading is 75mmhg. Determined the P absolute in the tank
a. 70.658 kpa
b. 68 kpa
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c. 58.78 kap
d. None of the above
meter per second does it strike the ground assume g = 10m/s².
a. 11m/s
b. 12m/s
a. Mass flow rate in lb/hr.
c. 13m/s
b. The velocity at section 2 in fps
d. 10m/s
Pabs = Patm – Pvacuum 349. Calculate:
a. 800,000lb/hr;625ft/s
∫KE = mV2/2gc
b. 900,000lb/hr;625 ft/s
c. 888,000lb/hr;269 ft/s
d. 700,000lb/hr;269 ft/s
352. While swimming a depth of 13m in a fresh water lake a fish emits an air bubble of volume 2 mm² atmospheric pressure is 100kpa what is the original pressure of the bubble.
m = A1V!/V1 350. A 600kg hammer of a pile driver is lilted 2m the pilling head. What is the change of potential energy? If the hammer is realest. What will be its velocity and the instant if it sticks the pilling?
a. 10,772 N-m and 5.26m/s
b. 13,200 N-m and 5.26m/s
c. 11,772 N-m and 6.26m/s
d. 11,77 2N-m and5.26m/s
∫PE = mgo(∫Z)/gc
MCQs Part VIII 351. A bayabas falls from a branch 5m above the ground with what speed in
a. 217.17 kpa
b. 119 kpa
c. 326.15 kpa
d. 210 kap
Pabs = Pg + Patm 353. Oxygen at 15ºC and 10.3 Mpa gauge pressure occupies 600L. What is the occupied by the oxygen at 8.28 Mpa gauge pressure and 35ºC?
a. 789.32 L
b. 796.32 L
c. 699 L
d. 588 L
V2= P1V1/T1P2
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354. Water is flowing through a 1 foot diameter pipe at the rate of 10ft/sec. What is the volume flow rate of water in ft³/sec?
t2= T2–T1 357. Water flow to a terminal 3 mm diameter and has an average speed of 2 m/s. What is the rate of flow in cubic meter/mm?
a. 7.85
b. 6.85
a. 0.0001m³/min
c. 8.85
b. 0.076 m³/min
d. 5.85
c. 0.085 m³/min
d. 0.097 m³/min
V = Aν 355. A certain fluid is flowing in a 0.5m x 0.3 channel at the rate of 3 m/s and has a specific volume of 0.012 m³/kg. Determined the mass of water flowing in kg/s.
a. 267 kg/s
b. 378 kg/s
c. 375 kg/s
d. 456.5 kg/s
m = Aν/V 356. A gas having a volume of100 ft³ at 27ºC is expanded to 120 ft³by heated at constant pressure to what temperature has it been heated to have this new volume?
a. 87°C
b. 85°C
c. 76°C
d. 97°C
358. Water flowing at a 6m/s through a 60 mm pipe is suddenly channeled into a 30 mm pipe. What is the velocity in the small pipe?
a. 34m/s
b. 24m/s
c. 15m/s
d. 27m/s
359. A vertical column of water will be supported to what height by standard atmospheric pressure.
a. 33.9 ft
b. 45 ft
c. 67 ft
d. 25.46 ft
ho= Po/Yo 360. A fluid flows in a steady manner between two section in a flow line at section 1: A 1 = 1ft², V1 = 100fpm,
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volume1 of 4ft³/lb. at sec2: A2 = 2 ft², p= 0.20 lb/ft³ calculate the velocity at section 2.
a. 625 fpm
b. 567 fpm
c. 356 fpm
d. None of the above
361. The weight of an object is 50lb. What is its mass at standard condition?
a. 50 lbm
b. 60 lbm
c. 70 lbm
d. 80 lbm
formula: m = Fgk /g 362. A vertical column of water will be supported to what height by standard atmospheric pressure. If the Y w = 62.4lb/ft3 po = 14.7 psi.
a. 44.9 ft
b. 33.9 ft
c. 22.9 ft d. 55.9 ft
formula: ho= po/Yw 363. For a certain gas R = 320 J/kg.K and cv= 0.84kJ/kg.K. Find k?
a. 1.36
b. 1.37
c. 1.38
d. 1.39
formula: k= R / cv+1 364. Ten cu. ft of air at 300psia and 400°F is cooled to 140°F at constant volume. What is the transferred heat?
a.-120Btu
b. -220Btu
c.-320Btu
d. -420Btu
formula: Q= mcv(T2-T1) 365. Utilizing the answer to the previous problem, estimate the overall or average increase in temperature ( ΔT) of the concrete roof from the energy absorbed from the sun during a12hour day. Assume that all of the radiation absorbed goes into heating the roof. The specific heat of concrete is about 900 J/kg, and the density is about 2,300 kg/m3.
a. 7.9 °C
b. 8.9°C
c. 9.9°C
d. 10.9°C
formula: ΔQ = m c ΔT 366. The concrete roof of a house is 10 m by 8 m and 10 cm thick (4"). Estimate
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the total heat the roof would absorb over the 12 day?
to 100 kmph in 5 sec. Find the driving force in Newton’s.
a. 1.3 x 108 J
a. 11,120 N
b 2.3 x 108 J
b. 11,320 N
c. 3.3 x 108 J
c. 11,420 N
d. 4.3 x 108 J
d. 11520 N
formula: ΔQ = ΔQ/Δtx Δt
formula: F= ma / k
367. The value for the ΔU of a system is -120 J. If the system is known to have absorbed 420 J of heat, how much work was done?
370. An ideal gas of volume 1liter and pressure 10 bar undergoes a quasistatic adiabatic expansion until the pressure drops to 1 bar. Assume γ to be 1.4 what is the final volume?
a. -540 J
b. -640 J
c. -740 J
d. -840 J
formula: ΔU = q +w 368. When the pressure on a 1 kg liquid is increased isothermally from 1 bar to 3000 bar the Gibbs free energy increases by 360 kJ. Estimate the density of the liquid.
a. 0.66 kg liter-1
b. 0.77 kg liter-1
c. 0.88 kg liter-1
d. 0.99 kg liter-1
369. A car whose mass is 2 metric tons is accelerated uniformly from stand hill
a. 3.18 l
b. 4.18 l
c. 5.18 l
d. 6.18 l
371. Two masses, one of the 10kg and the other unknown, are placed on a scale in a region where g = 9.67 m/sec2. The combined weight of these two masses is 174.06 N. Find the unknown mass in kg.
a. 20 kg
b. 19 kg
c. 18 kg
d. 17 kg
formula: m=Fg k / g
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372. The flow energy of 5 ft3 of a fluid passing a boundary to a system is 80,000 ft-lb. Determine the pressure at this point.
/kgK,k= 1.67) at 105 k/Paa, 27°C and delivers it at 630kPaa: ΔP = 0, ΔK= 0. Find the work if the process is isentropic?
a. 222 psi
a. –1664 kJ/min
b. 333 psi
b. –1774 kJ/min
c. 444 psi
c. –1884 kJ/min
d. 111 psi
d. –1994 kJ/min
formula: Ef= pV 373. Find ∫ for steam at 100 psia and 600°F.If h = 1329.6 and v = 6.216
a. 1214 Btu / lb
b. 1234 Btu /lb
c. 1342 Btu / lb
d. 1324 Btu /lb
formula: ∫ = h– pv/ J 374. What mass of nitrogen is contained in a10 ft3 vessel at a pressure of 840atm and 820°R? Make a computation by using ideal gas equation.
a. 194lb
b. 214lb
c. 394 lb
d. 413lb
formula: WSF = Q- ΔH m=p1V1/RT1 T2= T1(p2/p1)(k-1)/k 376. A carnot power cycle operates on 2 lb of air between the limits of 71 °F and 500°F. The pressure at the beginning of isothermal expansion is 400 psia and at the end of isothermal expansion is 185psig. Determine the volume at the end of isothermal compression.
a. 7.849 ft3
b. 7.850 ft3
c. 7.851 ft3
d. 7852 ft3
formula: V= mRT/ P P3= P2[T3/ T2] 377. During a polytropic process,10lb of an ideal gas, whose R= 40ft.lb/lb.R and cp = 0.25Btu/lb.R, changes state from 20 psia and 40°F to 120psia and 340°F. Determine n?
formula: m=pV /RT
a. 1.234
375. A rotary compressor receives 6m3/ min of a gas(R=410J/ kgK, cp=1.03kJ
b. 1.345
c. 1.456
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d. 1.356
d. 710°R
formula: [ p2/p1]n-1 / n = T2/T1
formula: °R= °F + 460
378. A perfect gas has a value of R= 319.2 J/ kf.K and k= 1.26. If 120 kJ are added to 2.27 kf\g of this gas at constant pressure when the initial temp is 32.2°C? Find T2.
381. Steam with a specific volume of 0.09596 m³/kg undergoes a constant pressure process at 1.70 MPa until the specific volume becomes 0.13796 m³/kg. What are (a) the final temperature, (b) ∆u, (c) W, (d)∆s, and (e) Q?
a. 339.4 K
b. 449.4 K
c. 559.4K
d. 669.4K
a) 265.4°C, 430.7kJ/kg, 71.4kJ/kg, 1.0327kJ/(kg) (K),502.1 kJ/kg
b) 204.2°C, -703.2 kJ/kg, -84.15 kJ/kg, -1.7505 kJ/(kg)(K), -787.4 kJ/kg
c) 304.2°C, -803.2 kJ/kg, -89.15 kJ/kg, -2.7505 kJ/(kg)(K), -987.4 kJ/kg
d) 279.4°C, 439.7kJ/kg, 79.4kJ/kg, 3.0327kJ/(kg) (K),602.1 kJ/kg
formula: cp = kR/ k-1 Q= mcp(T2-T1) 379. A certain gas, with cp = 0.529Btu/ lb. °Rand R = 96.2ft.lb/lb. °R, expands from 5 cu ft and 80°F to 15 cu ft while the pressure remains constant at 15.5psia. Compute for T2.
a.1520°R
b. 1620°R
c. 1720°R
d. 1820°R
formula: T2= T1V2/V1 380. A System has a temperature of 250°F. Convert this Value to °R?
a. 740°R
b.730°R
c. 720°R
382. Steam with an enthalpy of 2843.5 kJ/kg undergoes a constant pressure process at 0.9 MPa until the enthalpy becomes 2056.1 kJ/kg. What are (a) the initial temperature or quality, (b) ∆u, (c)W, (d) ∆s, and(e) Q?
a) 265.4°C, 430.7kJ/kg, 71.4kJ/kg, 1.0327kJ/(kg) (K),502.1 kJ/kg
b) 204.2°C, -703.2 kJ/kg, -84.15 kJ/kg, -1.7505 kJ/(kg)(K),-787.4 kJ/kg
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c) 304.2°C, -803.2 kJ/kg, -89.15 kJ/kg, -2.7505 kJ/(kg)(K), -987.4 kJ/kg
d) 279.4°C, 439.7kJ/kg, 79.4kJ/kg, 3.0327kJ/(kg)(K), 602.1 kJ/kg
Formula of #1and #2: ∆u = u2 –u1, W = p(v2-v1), ∆s =s2-s1, Q = h2 –h1 383. At throttling calorimeter receives steam from a boiler drum at0.11MPa and is superheated by 10 degrees. If the boiler drum pressure is 1.55 MPa, what is the quality of the steam generated by the boiler?
Heat is added until the pressure rises to 3.5 MPa and the temperature to 400°. Determine the heat added.
a) 1378.7 kJ
b) 1348.5 kJ
c) 1278,7 kJ
d) 1246,5 kJ
Formula: Q = (h2 – p2v2) –(h1 –p1v1) 386. Water vapor at 100 KPa and 150°C is compressed isothermally until half the vapor has condensed. How much work must be performed on the steam in this compression process per kilogram?
a) 95.20%
b) 70.10%
a) -1384.7 kJ
c) 65.60%
b) 1384.7 kJ
d) 95.56%
c) -2384.7 kJ
d) 2384.7 kJ
Formula: h1 = hf1 + x1hfg1 384. A steam calorimeter receives steam from a pipe at 0.1 MPa and 20°SH. For a pipe steam pressure of 2 MPa, what is the quality of the steam?
a) 95.56%
b) 70.10%
c) 95.20%
d) 85.10%
Formula: h1 = hf1 + x1hfg1 385. A 1-kg steam-water mixture at 1.0 MPa is contained in an inflexible tank.
387. Wet steam at 1 MPa flowing through a pipe is throttled to a pressure of 0.1 MPa. If the throttling temperature is110°C, What is the quality of the steam in the pipe?
a) 96%
b) 86%
c) 76%
d) 66%
388. Steam is throttled to 0.1 MPa with 20 degrees of superheat. (a) What is the
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quality of throttled steam if its pressure is 0.75 MPa (b) What is the enthalpy of the process?
a) 97.6%,2713 kJ/kg b) -97.6%, 2713 kJ/kg
c) 87.6%,3713 kJ/kg
d) -87.6%, 3713 kJ/kg
389. The pressure gauge on a 2000 m³ tank of oxygen gas reads 600 kPa. How much volumes will the oxygen occupied at pressure of the outside air 100 kPa?
a) 14026.5 m³
b) 15026.5 m³
c) 13026.5 m³
d) 16026.5 m³
Formula: P1V1/T1 =P2V2/T2 390. Assuming compression is according to the Law PV = C, Calculate the initial volume of the gas at a pressure of 2 bars w/c will occupy a volume of 6m³ when it is compressed to a pressure of 42 Bars.
391. A Gas tank registers1000 kPa. After some gas has been used, the gauge registers 500 kPa. What percent of the gas remains in the tank?
a) 64.40%
b) 74.60%
c) 58.40%
d) 54.60%
Formula: Pabs = Patm + Pgage & %= P2/P1 * 100% 392. The volume of a gas under standard atmospheric pressure & 76 cmHg is 200m³. What is the volume when pressure is 80 cmHg if the temperature is unchanged?
a) 180 in³
b) 170 in³
c) 160 in³
d) 190 in³
Formula: P2V2 = P1V1 393. While swimming at depth of120m in a fresh water lake, A fish emits an air bubbles of volume 2.0mm³ atmospheric pressure is 100kPa. What is the pressure of the bubble?
a) 130m³
b) 136m³
c) 120m³
a) 217.7 kPa
d) 126m³
b) 317.7 kPa
c) 417.7 kPa
d) 517.7 kPa
Formula: P1V1/T1 =P2V2/T2
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Formula: P= δh
Formula: 1hp= 746 watts
394. How many joules of work is the equivalent of 15000 cal of heat?
397. How many Newton’s (N) in 900,000 dynes?
a) 62850 joules
a) 8 Newton’s
b) 3579.95 joules
b) 9 Newton’s
c) 14995.81 joules
c) 7 Newton’s
d) 15004.19 joules
d) 6 Newton’s
Formula: J =Work/Heat
Formula: 1Newton (N)=100,000dynes
J = mechanical equivalent of heat whose value is 4.19 joules/calorie
398. Calculate the power output in horsepower of an 80-kg man that climbs a flight of stairs 3.8 m high in 4.0 s.
395. Two thick slices of bread, when completely oxidized by the body, can supply 200,000 cal of heat. How much work is this equivalent to?
a) 744.8 hp
b) 0.998 hp
a) 4,190,000 joules
c) 746 hp
b) 8,390,000 joules
d) 1.998 hp
c) 839,000 joules
Formula: Power = Fd/t = mgh/t
d) 419 000 joules
F = W = mg
Formula: J =Work/Heat J = mechanical equivalent of heat whose value is 4.19 joules/calorie 396. 3 horsepower (hp) = _____________watts?
a) 1492 watts
b) 2238 watts
c) 746 watts
d) 2238 kilowatts
d=h 399. How many calories of heat will be needed to raise the temperature of 200 g of iron from 27°C to 80°C? (c = 0.11 cal/g. °C)
a) 1.16 kcal
b) 2166 cal
c) 3.16 kcal
d) 4166 cal
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Formula: H = mc∆T 400. 100g of iron was heated to 100°C and mixed with 22g of water at 40°C. The final temperature of the mixture was 60°C. Show that the heat given off by the iron equals the heat absorbed by the water.
a) 440 cal
b) 540 cal
c) 340 cal d) 640 cal
Formula: H (given off by iron) = H (absorbed by water), mc∆T(iron)= mc∆T(water)
MCQs Part IX
b. Boyle’s Law
c. Dalton’s Law
d. Amagat’s Law
403. Avogadro’s Number NA
a. 6.2205 x 10^23 mol-1
b. 6.2025 x 10^23 mol-1
c. 6.0225 x 10^23 mol-1
d. 6.2250 x 10^23 mol-1
404. The first law of thermodynamics may be expressed in the following equivalent
a. the net heat transfer id equal to the network
b. the sum of the total energy forms leaving the system boundary is always equal to the energy input
c. energy can neither be created nor destroyed but only converted from one form to another
d. all of the above
401. An engineering science primarily concerned with heat and work conversions.
a. Thermodynamics
b. Mechanics
c. Physics
d. Electromagnetic
402. “If the temperature o f a fixed quantity of a gas is held constant during a change of state, the volume varies inversely with the absolute pressure.
a. Charle’s Law
405. A system whose boundary does not allow the exchange of either matter or energy with the surrounding
a. open system
b. closed system
c. isolated system
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d. none of the above
406. The specific terms used in phase transitions
a. melting
b. evaporation
c. freezing
d. sublimation
407. The density of water at 4°C is
a. 1 gm/cm³
b. 2 gm/cm³
c. 3 gm/cm³
d. 4 gm/cm³
408. Archimedes principle states that
a. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is equal to the weight of the displaced fluid b. when a body is inversed in a fluid, the fluid exerts a upward force on the body whose magnitude is equal to the weight of the displaced fluid. c. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is greater than the weight of the displaced fluid.
d. when a body is inversed in a fluid, the fluid exerts a downward force on the body whose magnitude is lower than the weight of the displaced fluid.
409. Types of system except one
a. closed
b. open
c. isolated
d. solid
410. Isometric process is
a. T = P
b. P = C
c. V = C
d. T = V
411. The ratio of the change in energy in the form of the heat
a. relative density
b. specific heat
c. specific gravity
d. none of the above
412. Specific heat ratio is always
a. > 1
b. < 1
c. = 1
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d. none of the above
413. It states that mass is a commodity that can neither be heated nor destroyed with the exception of nuclear processes where the conversion of mass into energy is a fundamental principle
a. Law of Conservation of Mass
b. Law of Conservation of Energy
c. Law of Conservation of Power
d. Law of Conservation of Heat
414. The energy that stored in a system as a result of its position in the earth’s gravitational field
c. Gabriel Danelle Fahrenheit
d. Danelle Gabriel Fahrenheit
417. Developed the centigrade or Celsius
a. Andres Celsius
b. Anders Celsius
c. Andrew Celsius
d. Anthony Celsius
418. Instrument used to measure the absolute pressure of the atmosphere
a. galvanometer
a. elastic energy
b. thermometer
b. kinetic energy
c. barometer
c. potential energy
d. pressure gages
d. flow energy
415. It involves a force deforming a solid body
419. A vector quantity whose direction is the same as the direction of the velocity
a. Force
a. non-elastic work
b. Momentum
b. non-flow work
c. Friction
c. flow work
d. Resultant
d. elastic work
416. Developed the Fahrenheit scale
a. Gabriel Daniel Fahrenheit
b. Daniel Gabriel Fahrenheit
420. Conceptualize that the heat was an energy form and that there was a precise relationship between heat and work.
a. Count Rumford
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b. Sir Humpry Davey
c. Work
c. James Prescott
d. None of the above
d. all of the above
421. Which is true:
a. Energy is a scalar quantity
b. Energy is a vector quantity
c. Energy is vector & scalar
d. None of the above
422. It is a region enclosed by specified boundaries, which may be imaginary, either fixed or moving
a. Isolated system
b. Open system
c. System
d. None of the above
423. Amount or volume of liquid that pass in a given limit of time
a. Flow rate
b. Volume
c. Time
d. None of the above
424. Ability to do work
a. Power
b. Energy
425. Amount of heat needed to rate the temperature of a substance by 1°C
a. Heat Exchange
b. Heat Engine
c. Specific Heat
d. None of the above
426. Study of transformation of heat energy to mechanical energy to other forms of energy.
a. Thermodynamics
b. Physics
c. Mechanics
d. None of the above
427.Heat cannot be created, nor destroyed, but it can be changed from one form to another. The energy in the universe remains constant.
a. 1st Law of Energy Conservation
b. 2nd Law of Energy Conservation
c. 3rd Law of Energy Conservation
d. None of the above
428. Quantities that describe both magnitude & direction
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a. Physical Quantity
b. Barometer
b. Scalar Quantity
c. Manometer
c. Vector Quantity
d. None of the above
d. None of the above
429. The sum of energies of all the molecules in a system, energies that appear in several complex forms.
433. Work done in pushing a fluid across a boundary, Usually into or out of a system
a. Flow Work
a. External Energy
b. Flow Energy
b. Internal Energy
c. Both a & b
c. Kinetic Energy
d. None of the above
d. None of the above
430. The value of atomic charge e is
a. 1.60210 x 10-19 coulomb
b. 1.68910 x 10 coulomb
c. 1.20160 x 1019 coulomb
d. None of the above
434. Which is not true about Heat (Q):
a. Q is positive when heat is added to the body or system
b. Q is negative when heat is rejected by the body or system
c. Q is positive when heat is rejected by the body or system
d. None of the above
-19
431. p1V1= p2V2
435. The standard reference atmospheric pressure
a. Charle's Law
b. Boyle's Law
a. 760 mmHg
c. Ideal Gas Law
b. 1 atm
d. Joule's Law
c. 14.696 psia
d. All of the above
432. A _______ is used to measure atmospheric pressure.
a. Thermometer
436. ______ is that property of a substance which remains constant if no
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heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.
a. Entrophy
b. Enthalpy
c. Specific Heat
d. None of the above
437.The acceleration of a particular body is directly proportional to the resultant force acting on it & inversely proportional to its mass.
a. Pascal's Law
b. Joule's Law
c. Newton's Law
d. None of the above
438. Mass (not weight) per unit volume
c. Specific Heat
d. None of the above
440. A classification of system in which mass does not cross its boundaries.
a. Nonflow System
b. Open System
c. Closed System
d. None of the above
441. Gas being heated at constant volume is undergoing the process of.
a. isometric
b. specific heat
c. enthalpy
d. isothermal
442. The heat per unit mass per degree change in temperature
a. Specific Weight
a. specific heat
b. Specific Volume
b. isometric
c. Density
c. conservation of energy
d. None of the above
d. none of the above
439. Composite property applicable to all fluids
a. Entropy
b. Enthalpy
443. A unit of pressure used in high vacuum technology, which is equal to 1mmhg.
a. specific heat
b. isometric
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c. isobaric
c. Isolated System
d. torr
d. Enthalpy
444. The gas constant is equal to
448. The ratio of the weight of a substance to the weight of some standard substance is called?
a. Cp – Cv
b. Cp + Cv
a. Specific Heat
c. Cp – Cv + k
b. Specific Gravity
d. None of the above
c. Isothermal
d. Specific Weight
445. The 1st Law of Thermodynamics on what principle?
a. Conservation of Energy
b. Conservation of mass
c. Enthalpy d. Isometric
446. A system having a rigid boundary that energy, work and mass does not cross its boundaries
a. Specific Heat
b. Specific Gravity
c. Isolated System
d. Enthalpy
447. Sum of the internal energy of a substance and the product of pressure and volume.
a. Specific Heat
b. Specific Gravity
449. Specific heat capacity in SI unit.
a. kJ / kg.k
b. kJ / kg
c. kN / kg
d. None of the above
450. The Law of Thermodynamics that provides the basis for measuring the thermodynamic property of temperature.
a. Charle’s Law
b. Boyle’s Law
c. Zeroth Law
d. Gas Law
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b. Closed System
MCQs Part X
c. Surrounding
451. The pressure of the confined gas is held constant, the volume directly proportional to the absolute temperature.
d. Isentropic
455. A state occurs in isentropic process
a. Charle’s Law
a. The change in entropy is 0
b. Boyle’s Law
b. The change in entropy is 1
c. Zeroth Law
c. The change in enthalpy is 0
d. Gas Law
d. The change in enthalpy is 1
452. Regardless of the process, the change in enthalpy firm moles of ideal gas is
456. The SI unit of mass
a. kg
a. Heat
b. g
b. Enthalpy
c. N
c. Entropy
d. None of the above
d. Density
453. Ideal process are ________ process
457. Anything that is outside the system boundary is called ________.
a. Surrounding
a. Irreversible
b. Natural Environment
b. Reversible
c. Closed System
c. Isothermal
d. Open System
d. Isometric
454. A state occurs when a system is in equilibrium
a. Natural Environment
458. A Thermodynamic Term That refers to any fixed region in a space
a. Control Volume
b. Volume
c. Density
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d. Natural Gas
459. The process that has no heat transfer
463. The law of conservation of mass states that ______.
a. mass is indestructible
a. Density
b. mass is destructible
b. Isentropic Process
c. mass is indestructible
c. Isometric Process
d. none of the above
d. Adiabatic
460. Another name of reversible adiabatic process
464. __________ is the energy stored within a body or substance by virtue of the activity and configuration of its molecules.
a. Isentropic Process
a. Internal Energy
b. Isometric Process
b. External Energy
c. Isobaric Process
c. Kinetic Energy
d. Isothermal Process
d. Potential Energy
461. ______ of a Body is the absolute quantity of a matter in it.
a. Mass
b. Weight
c. Density
d. Volume
462. _______ of a body means the force of the gravity Fg on the body
a. Mass
b. Weight
c. Density
d. Volume
465. The Product of the displacement of the body and the component if the force in the direction of the displacement.
a. Nonflow Work
b. Flow Work
c. Work
d. None of the above
466. Is the energy in transit (on the move) from the one body or system to another solely because of a temperature between the bodies or systems.
a. Work
b. Heat
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c. Energy
c. Multistaging
d. None of the above
d. None of the above
467. A classification of a system in which mass crosses its boundaries.
471 Is define as the ratio of the actual pressure of the vapor
a. Closed System
a. Relative Humidity
b. Open System
b. Humidity Ratio
c. Isolated System
c. Dew Point
d. None of the above
d. Adiabatic Saturation
468. The SI unit of pressure
a. Pa
b. N
c. J
d. None of the above
469. The volume of a confined gas is held constant, the pressure is directly proportional to the absolute temperature.
472. Heat engine deriving its power from the energy liberated by the explosion of a mixture of some hydrocarbon, in a gaseous or vaporized form.
a. Dual Combustion Engine
b. Internal Combustion Engine
c. External Combustion Engine
d. None of the above
473. Also called absolute humidity and specific humidity.
a. Charle’s Law
b. Boyle’s Law
a. Related humidity
c. Joule’s Law
b. Humidity ratio
d. Specific Heat
c. Dew point
d. Adiabatic ratio
470. The compression of the gas in two or more cylinders in place of a single cylinder compressor
a. Single Staging
b. Double Staging
474. Is a steady flow process at total constant pressure through a control volume for which there is no heat?
a. Adiabatic Saturation Process
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b. Dew point
a. Banometer
c. Adiabatic Ratio
b. Nanometer
d. None of the above
c. Thermometer
d. Manometer
475. Fuels that may classified conveniently in solid, liquid and gaseous.
479. If any one or more properties of a system change, the system is said to have undergone a _______.
a. Unleaded fuel
b. Diesel fuel
a. Cycle
c. Fossil fuel
b. System
d. All of the above
c. Process
d. None of the above
476. Is a general name, without specific meaning unless the way in which it is measured or define by the context.
480. Is a thermodynamic system that operates continuously with only energy (heat and work) crossing its boundaries?
a. Natural Value
b. Heating Value
a. Heat Engine
c. Burning Value
b. Heat Reservoir
d. Internal Value
c. Heat Source
d. Heat Sink
477. Is the force of gravity on unit volume?
481. _______________ is the temperature at which liquids start to boil or the temperature at which vapors begin to condense.
a. Specific Weight
b. Specific Heat
c. Specific Pressure
a. Saturation Temperature
d. Specific Volume
b. Sub cooled Liquid
c. Compressed Liquid
d. Saturated Liquid
478. Give a reading as the length of some liquid column: water, alcohol, etc.
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482. ________________ is one which has a temperature lower than the saturation temperature corresponding to the existing pressure.
a. Saturation Temperature
b. Sub cooled Liquid
c. Compressed Liquid
d. Saturated Liquid
483. _________________ is one which has a pressure higher than the saturation pressure corresponding to the existing temperature.
a. Saturation Temperature
b. Sub cooled Liquid
c. Compressed Liquid
d. Saturated Liquid
484. __________________ is a liquid at the saturations which has temperature equal to the boiling point corresponding to the existing pressure.
a. Saturation Temperature
b. Sub cooled Liquid
c. Compressed Liquid
d. Saturated Liquid
485. __________________ is the name given to a gaseous phase that is in contact with the liquid phase, or that is in the vicinity of a state where some of it might be condensed.
a) Vapor
b) Saturated Vapor
c) Superheated Vapor
d) Wet Vapor
486. ___________________ is a vapor at the saturation conditions (saturation temperature and saturation pressure).
a) Vapor
b) Saturated Vapor
c) Superheated Vapor
d) Wet Vapor
487. ___________________ is a vapor having a temperature higher than the saturation temperature corresponding to the existing pressure.
a) Vapor
b) Saturated Vapor
c) Superheated Vapor
d) Wet Vapor
488. __________________ is a combination of saturated vapor and saturated liquid.
a) Vapor
b) Saturated Vapor
c) Superheated Vapor
d) Wet Vapor
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489. ___________________ represents the highest pressure and highest temperature at which liquid and vapor can coexist in equilibrium.
d) None of the above
493. What is the formula to convert °F to °C?
a) Critical Point
a) °C = °F + 273
b) Boiling Point
b) °C = 5/9 (°F - 32)
c) Quality Point
c) °C = 9/5 (°F)+32
d) None of the above
d) None of the above
490. Heat that cause change in temperature at without a change in phase.
a) Sensible Heat
b) Latent Heat
c) Thermo Heat
d) None of the above
491. Heat that cause change in phase without a change in temperature.
494. ______________ is the base unit of thermodynamics temperature.
a) Celsius
b) Fahrenheit
c) Kelvin
d) None of the above
495. __________ is the unit of force.
a) Newton
a) Sensible Heat
b) Pascal
b) Latent Heat
c) Hertz
c) Thermo Heat
d) Joule
d) None of the above
492. What is the formula to convert °C to °F?
496. __________ is the unit of pressure and stress.
a) Newton
a) °F = °C + 273
b) Pascal
b) °F = 5/9 (°C - 32)
c) Hertz
c) °F = 9/5 (°C)+32
d) Joule
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97. _____________ is the difference between the actual temperature of superheated vapor and the saturation temperature for the existing pressure.
a) Degrees of Superheat, °SH
b) Degrees of Sub cooled, °SB
c) Both a and b
d) None of the above
498. ____________is the difference between the saturation temperature for the given pressure and the actual sub cooled liquid temperature.
a) Degrees of Superheat, °SH
b) Degrees of Sub cooled, °SB
c) Both a and b
d) None of the above
499. ___________ is the percent by weight that is saturated vapor.
c) Vapor
c) Liquid
MCQs Part XI 501. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?
a. 4
b. 3
c. 2
d. 1
502. What is the value of the work done for a closed, reversible isometric system?
a. zero
b. positive
a) Quality, x
c. negative
b) Percent Moisture, y
d. positive or negative
c) Vapor
d) Liquid
500. ____________ is the percent by weight that is saturated liquid.
a) Quality, x
b) Percent Moisture, y
503. The first law of thermodynamics is based on which of the following principles?
a. Conservation of mass
b. Conservation of energy
c. Action and reaction
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d. The entropy-temperature relationship
504. Which of the following cycle is used in vapor cycle power plant?
c. Reversible properties
d. Irreversible properties
508. What refers to the thermodynamic properties which are independent on the amount of the substance present?
a. Brayton cycle
b. Diesel cycle
a. Extensive property
c. Ericson cycle
b. Intensive properties
d. Rankine cycle
c. Reversible properties
d. Irreversible properties
505. Which of the following is not a thermodynamic property?
a. Pressure
b. Temperature
c. Volume
d. Phase
506. Which of the following compressibility factor of ideal gas
a. 1
b. 2
c. 1.5
d. 0
507. What refers to the thermodynamic properties which are dependent on the amount of the substance present?
a. Extensive property b. Intensive properties
509. What is known as the total heat and heat content at various times in the history?
a. enthalpy
b. entropy
c. internal energy
d. latent heat
510. What is the measure of the energy that is no longer available to perform useful work within the current environment?
a. enthalpy
b. entropy
c. internal energy
d. latent heat
511. What is the temperature when water and vapor are in the equilibrium with the atmospheric pressure?
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a. Ice point
b. Steam point
c. Critical point
d. Freezing point
512. What is the unique state at which solid, liquid and gaseous phase can go co-exist in equilibrium?
a. Triple point
b. Critical point
c. Boiling point
d. Pour point
513. What refers to the state at which liquid and gaseous phases are indistinguishable?
a. Triple point
b. Critical point
c. Boiling point
d. Pour point
514. What refers to the heat needed to change the temperature of the substances without changing its phases?
a. Latent heat
b. Sensible heat
c. Specific heat
d. entropy
515. What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degrees Celsius?
a. Kilojoule
b. Btu
c. Kilocalorie
d. Latent heat
516. To what conditions does a gas behave like an ideal gas?
a. low temperature and low pressure
b. low temperature and high pressure
c. high temperature and low pressure
d. high temperature and high pressure
517. What Law states that the pressure of gas is inversely proportional to its volume at constant temperature?
a. Charles’ law
b. Gay-Lussac’s Law
c. Boyle’s Law
d. Dalton’s Law
518. What do you call a system in which there is a flow of matter through the boundary?
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a. Closed system
b. Open system
c. Isolated system
d. All of these
519. Which of the following best describes heat?
a. The capacity to do work
b. Forces times distances
c. Sum of thermal and chemical energy
d. An energy transfer due to temperature difference
520. The mechanical equivalent of heat is
a. joule
b. calorie
c. Btu
d. Specific heat
521. Burning of Gasoline initially requires heat before it burns spontaneously. Which of the following does not give a good explanation of this phenomenon?
a. the initial heat rises the enthalpy of the reactant
b. the initial heat lowers the activation of energy of the reactants
c. the enthalpy of reactants is lower than the enthalpy of products.
d. The enthalpy of the product is lower than the enthalpy of the reactant
522. The phenomenon of melting under pressure and freezing again when the pressure is reduced is known as
a. sublimation
b. condensation
c. deposition
d. regelation
523. Which of the following events is heat exchange involved?
a. when there is a phase change
b. when there is a chemical reaction
c. when the gas expands adiabatically
d. when there is difference in temperature
524. What is the entropy of a pure substance at a temperature of absolute zero?
a. unity
b. zero
c. infinity
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d. undefined
525. What is the area under the curve on a temperature –entropy diagram?
a. Heat
b. work
c. entropy
d. volume
b. halves
c. quadruples
d. triples
529. When the expansion of compression of gas takes place without transfer of heat or from the gas the process is called;
a. Isometric process
526. What happens to the internal energy of water at reference temperature where enthalpy is zero?
b. Isothermal process
c. Isobaric process
a. Becomes negative
d. Adiabatic process
b. Becomes positive
c. Remains constant
d. Cannot be defined
527. Which of the following is the work done for a closed reversible isometric system?
a. negative
b. positive
c. zero
d. undefined
528. If the initial volume of an ideal gas is compressed to one-half its original volume and to twice its original temperature, the pressure:
a. doubles
530. Which of the following best describes both Stirling and Ericson engines?
a. Internal combustion engine
b. External combustion engine
c. Diesel cycle
d. Rankine cycle
531. At steam point, the temperature of water and its vapor at standard pressure are:
a. Extremes or maximum
b. unity
c. in equilibrium
d. undefined
532. Who coined the word Entropy?
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a. Rudolf Clausius
b. Lord Kelvin
c. Gabriel Volks
d. Rudolf Diesel
533. What is the temperature when water and vapor are in equilibrium with the atmospheric pressure?
536. Which law that states “Entropy of all perfect crystalline solids is zero at absolute zero temperature”?
a. Zeroth law of thermodynamics
b. First law of thermodynamics
c. Second law of thermodynamics
d. Third law of thermodynamics
a. Ice point
b. Steam point
c. Critical point
d. Freezing point
534. When the expansion of compression of gas takes place without transfer of heat to or from the gas the process is called
a. reversible
b. adiabatic
c. polytropic
d. isothermal
535. What refers to a liquid whose temperature is lower than saturation temperature corresponding to the existing pressure?
d. Compressed liquid
537. A 0.064 kg of octane vapor (MW = 114) is mixed with0.91 kg of air (MW = 29.0) in the manifold of an Engine. The total pressure in the manifold is 86.1 kPa, and a temperature is 290 K. assume octane behaves ideally. What is the partial pressure of the air in the mixture in KPa?
a. 46.8
b. 48.6
c. 84.6
d. 64.8
538. Which of the following occurs in a reversible polytrophic process?
a. Enthalpy remains constant
b. Internal energy does not change
a. Subcooled liquid
b. Saturated liquid
c. Some heat transfer occurs
c. Pure liquid
d. Entropy remains constant
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539. The change that the system that undergoes from one equilibrium state to another is known as
a. oath
b. process
c. enthalpy change
d. entropy change
540. What refers to the series of states through which a system passes during the process?
c. Isolated system
d. All of these
543. What is referred to by control volume?
a. An isolated system
b. Closed system
c. Fixed region in space
d. Reversible process only
544. Which of the following is used in thermal power plant?
a. path
b. quasi- static steps
a. Brayton cycle
c. reversibility moves
b. Reversed carnot cycle
d. irreversibility moves
c. Rankine cycle
d. Otto cycle
541. Which of the following relations is not applicable in a free expansion process?
a. Heat is rejected to zero
b. Work done is zero
c. Change in temperature is zero
d. Heat supplied is zero
542. What system in which neither mass nor energy cross the boundaries and is not influenced by the surroundings?
545. A Bell-Coleman cycle is a reversed of which the following cycles?
a. Stirling cycle
b. Joule cycle
c. Carnot cycle
d. Otto cycle
546. An ideal gas is compresses isothermally. The enthalpy change is
a. Closed system
a. Always negative
b. Open system
b. Always positive
c. zero
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d. undefined
547. The state of a thermodynamic system is always defined by its:
a. Absolute temperature
b. process
c. properties
d. temperature and pressure
548. Entropy is the measure of:
c. Isolated system
d. Non-flow system
MCQs Part XII 551. Which of the following cannot be a property of a gas?
a. density
b. pressure
a. The internal energy of a gas
c. viscosity
b. The heat capacity of a substance
d. temperature
c. Randomness or disorder
d. The change of enthalpy of a system
549. What system in which there is no exchange of matter with the surrounding or mass does not cross its boundaries?
a. Open system
b. Closed system
c. Isolated system
d. Non-flow system
550. What refers to a system in which there is a flow of mass across its boundaries?
a. Open system
b. Closed system
552. During the adiabatic process, which of the following is the change in entropy?
a. zero
b. greater than zero
c. less than zero
d. infinity
553. Which of the following values characterize the state of the system?
a. cycle
b. process
c. property
d. enthalpy
554. Which of the following is least efficient?
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a. Gas turbine
b. Second law
b. Diesel engine
c. Third law
c. Carnot engine
d. Law of conservation of energy
d. Gasoline engine
555. Which of the following engines is the most efficient?
559. Which of the following is the other term used for enthalpy-entropy diagram?
a. Enthalpy diagram
a. Gas turbine
b. Mollier diagram
b. Diesel engine
c. Steam diagram
c. Carnot engine
d. Entropy chart
d. Gasoline engine
556. Which of the following engines is the most efficient?
560. What is used for predicting the behavior of non-ideal gases?
a. Compressibility factor
a. Isobaric expansion
b. Expansivity factor
b. Adiabatic compression
c. Emissivity factor
c. Adiabatic expansion
d. Van-d-whal’s factor
d. Isothermal expansion
557. Who coined the word energy?
561. Which of the following thermodynamic devices operates the reverse of the heat engine?
a. James Joule
a. Thermal pump
b. Thomas Young
b. Thermal evaporator
c. Rudolf Diesel
c. Thermal condenser
d. Lord Kelvin
d. Thermal equilibrant
558. Which of the following laws of thermodynamic which leads to the definition of entropy?
a. First law
562. What is another term used for isometric processes?
a. Isochoric process
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b. Iolytropic process
c. Isothermal process
d. Reversible process
563. Which of the following engines was introduced by a German engineer, Nickolas Otto?
a. Gasoline engine
b. Diesel engine
c. Gas turbine
d. Thermal engine
564. If two systems are in the thermal equilibrium with a third system, then they must be in thermal equilibrium with each other.
d. Latent Heat Of Condensation
566. A thermodynamic process in which entropy is conserved
a. isentropic
b. adiabatic
c. isothermal
d. polytropic
567. A control volume refers to what?
a. A fixed region in space
b. A reversible process
c. an isolated system
d. a specified mass
568. Which of the following is commonly used as liquid absorbent?
a. Zeroth Law of Thermodynamics
b. First Law of Thermodynamics
a. Silica gel
c. Second Law of Thermodynamics
b. Activated alumina
c. Ethylene glycol
d. None of these
d. Third Law of Thermodynamics
565. The heat absorbed by a unit mass of a material at its holding point in order to convert the material into a gas at the same temperature.
a. Latent Heat of Sublimation
b. Latent Heat of Vaporization
c. Latent Heat of Fusion
569. One for which no heat is gained or lost
a. Isentropic
b. Adiabatic
c. Isothermal
d. Polytropic
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570. A law relating the pressure, temperature and volume of an ideal gas
a. Gay-Lussac’s Law
b. Ideal gas Law
c. Charles’ Law
d. Boyle’s Law
571. Occurs when the vapor pressure equals the atmospheric pressure
c. decreases
d. is basically zero
574. Occurring at fixed temperature
a. isentropic
b. Adiabatic
c. Isothermal
d. polytropic
575. The changing of solid directly to vapor without passing through liquid state is called
a. Boiling
b. Melting
c. Freezing
a. Evaporation
d. Vaporizing
b. Vaporization
c. Sublimation
d. Condensation
572. As temperature goes to “0”, the entropy approaches a constant
a. Zeroth Law of Thermodynamics
b. First Law of Thermodynamics
c. Second Law of Thermodynamics
d. Third Law of Thermodynamics
573. An ideal gas is compressed in a cylinder so well insulated that there is essentially no heat transfer. The temperature of gas
a. Remains constant
b. increases
576. The phase transition of a liquid to a solid
a. Solidification
b. Freezing
c. Fusion
d. All of these
577. It is an energy flux, equal to the rate of energy flow per unit area per unit time across some surface.
a. Irradiance
b. Radiant Intensity
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c. Luminosity
a. Gamma Radiation
d. Brightness
b. Black Body Radiation
c. Electromagnetic Radiation
d. Alpha Radiation
578. The volume of a gas under constant pressure increases or decrease with temperature.
a. Gay- Lussac’s Law
b. Ideal Gas Law
c. Charles’ Law
d. Boyle’s Law
579. The molecular number density of an ideal gas at standard temperature and pressure in cm3
582. The radiation emitted by a body as a result of its temperature.
a. Blackbody Radiation
b. Thermal Inversion
c. Thermionic Inversion
d. Thermal Radiation
583. At Equilibrium, the radiation emitted must equal the radiation absorbed.
a. Froude number
b. Loschmidt number
a. Boyle’s Law
c. Mach number
b. Planck’s Law
d. Reynold number
c. Kirchoff’s Law
d. Joule’s Law
580. A temperature scale whose zero point is absolute zero, the temperature of “0” entropy at which all molecular motion stops.
584. The theory that heat consisted of a fluid, which could be transferred from one body to another, but not “created” or “destroyed”.
a. Celsius
b. Fahrenheit
a. Clausius Theorem
c. Kelvin
b. Caloric Theory
d. Rankine
c. Joules Law
d. Newton’s Law of cooling
581. The thermal radiation emitted by a blackbody heated to a given temperature.
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585. The volume of a gas is directly proportional to the number of molecules of the gas.
a. Ideal gas law
b. Boyle-Mariotte Law
c. Avogadro’s Hypothesis
d. Gay-Lussac’s Law of combining Volumes
586. For a body cooling in a draft, the rate of heat loss is proportional to the difference in temperature between the body and its surroundings.
b. First Law of Thermodynamics
c. Second Law of Thermodynamics
d. Third Law of Thermodynamics
589. A cylinder contains oxygen at a pressure of 10 atm and a temperature of 300 K. The volume of the cylinder is 10 liters. What is the mass of the oxygen in grams? Molecular weight (MW) of oxygen is 32 g/mole?
a. 125.02
b. 130.08
a. Nemst Effect
c. 135.05
b. Caloric Theory
d. 120.04
c. Joule’s Law
d. Newton’s Law of Cooling
587. It is the intensity of a radiating source.
590. It is the deposition of radiant energy as heat into an absorbing body.
a. Radiation
b. Ionization
a. Specific Brightness
c. Convection
b. Radiance
d. Insolation
c. Surface Brightness
d. All of these
588. This law of thermodynamics prohibits the construction of a perpetual motion machine “of the second kind”
a. Zeroth Law of Thermodynamics
591. It is a process during which the pressure remains constant
a. Adiabatic
b. Isentropic
c. Isobaric
d. Isotropic
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592. Diffusion due to thermal motion is called
a. dilation
b. infusion
c. effusion
d. dispersion
593. The rate at which this is quantity passes through a fixed boundary per unit time
c. Four-stroke engine
d. Eight-stroke engine
596. It is the unbalanced force developed in a turbo jet engine that is caused by the difference in the momentum of the low-velocity air entering the engine and the high velocity exhaust gases leaving the engine.
a. Fall
b. Lift
a. Flux
c. Drag
b. Existence
d. Thrust
c. Irradiance
d. All of these
594. Energy can neither created nor destroyed. It can only change forms.
597. Which of the engine is used for fighter bombers?
a. Turbojet
b. Pulsejet
a. Conservation of Mass Principle
c. Rockets
b. Conservation of Energy Principle
d. Ramjet
c. Conservation of Momentum Principle
598. The Science of Energy
a. Thermionics
d. Conservation of Heat Principle
b. Kinetics
595. Executes the entire cycle in just two strokes the power stroke and the compression stroke.
c. Thermodynamics
d. Geophysics
a. One-stroke engine
b. Two-stroke engine
599. It is used for gas turbines which operates on an open cycle where both the compression and expansion
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processes take place in rotating machinery.
11. Closed system 12. Isolated system
a. Dual Cycle
13. Open system
b. Otto Cycle
14. All of the above
c. Carnot Cycle
d. Brayton Cycle
600. Which of the following laws of thermodynamic which leads to the definition of entropy?
15. Control surface 16. Property 17. Intensive and extensive 18. Intensive property 19. Extensive property 20. Mass
a. First law
b. Second law
22. Specific properties
c. Third law
23. Thermal
d. Law of conservation of energy
21. Density
24. Mechanical 25. Phase 26. Chemical
Answers Sheet MCQs Part I 1. Heat power 2. Lord Kelvin 3. First law of Thermodynamics 4. Second law of Thermodynamics 5. Classical thermodynamics 6. Statistical thermodynamics 7. System 8. Conservation of energy
27. State postulate 28. Kj 29. Simple compressible 30. Process 31. Path 32. 2 33. Quasi-state or quasi- equilibrium process 34. Control mass 35. Control volume
9. Surroundings
36. Thermal, phase, mechanical and chemical
10. Boundary
37. Cycle
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38. Isothermal process
64. Constant-volume gas thermometer
39. Isobaric process
65. Triple point of water
40. Isochoric or isometric process
66. Pressure
41. Remains constant
67. N/m^2
42. No change with time
68. 14.223 psi
43. No change with location
69. Pa
44. Steady-flow process
70. 10^5
45. Internal energy
71. 101,325
46. Microscopic form of energy
72. Absolute pressure
47. Macroscopic form of energy
73. Vacuum pressure
48. Thomas Young
74. Gage
49. Translational energy
75. Pitot tube
50. Rotational kinetic energy
76. Barometer 77. 760
MCQs Part II
78. Pascal’s Law
51. Spin energy
79. Bourdon pressure gage
52. Sensible energy
80. Heat
53. Latent energy
81. Joule
54. Chemical energy
82. Kg ∙ m^2/s^2
55. Nuclear energy
83. 4.184
56. Heat transfer and work
84. 10^-7
57. Zeroth law of thermodynamics
85. Law of conservation of energy
58. R.H. Fowler
86. Thermodynamics
59. Kelvin scale
87. Enthalpy
60. Rankine scale
88. Heat capacity
61. Ideal gas temperature scale
89. Molar heat
62. Constant-volume gas thermometer
90. Specific heat
63. Coulomb repulsion
91. Hess’s Law
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92. Entropy 93. Joule/Kelvin 94. Enthalpy 95. Compressed or subcooled 96. Saturated 97. Saturated 98. Superheated
116. Universal gas constant to molar mass 117. 8.314 118. Molar mass 119. Specific heat 120. Specific heat capacity 121. 4185 122. J/kg∙ °C
99. Pure 100. Saturation temperature
123. Specific volume of density 124. Adiabatic 125. Not to be passed
MCQs Part III
126. All of the above
101. Saturation pressure
127. Radiation
102. Heat of fusion
128. Convection
103. Heat of vaporation
129. Conduction
104. Latent heat
130. Conservation of mass principle
105. 333.7 kJ/kg
131. PV = nRT
106. 2257.1 kJ/kg 107. Maximum point
132. Both heat transfer = 0; isentropic: reversible
108. Sublimation
133. PV = nRT
109. Kilocalorie
134. Thermal conductivity
110. BTU
135. Greenhouse effect
111. 1054
136. Boundary work
112. Heat
137. 0.1 to 100 µm
113. Quality
138. Emissive power
114. Pressure, temperature and specific volume
139. Kirchhoff’s radiation law
115. Gas constant
141. Gray body
140. Black body
142. Less than Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
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143. It is independent with the surface condition of the material 144. 1
166. Carnot heat engine 167. Carnot principle 168. Second law of thermodynamics
145. 1
169. Isentropic
146. Stefan-Boltzmann law 147. Conservation of energy principle 148. Energy balance 149. Mass and energy content of the control volume 150. Network output to total heat input
170. True 171. Internally reversible, adiabatic process 172. Third law of thermodynamics 173. Third law of thermodynamics 174. Entropy balance relation 175. Second law of thermodynamics
MCQs Part IV
176. Heat
151. Second law of thermodynamics
177. It is always zero
152. Kelvin-Planck statement
178. Its saturated vapor pressure equals to the atmospheric pressure
153. Combustion efficiency 154. Overall efficiency
179. 0 degree Celsius and one atmosphere
155. Energy efficiency rating
180. Zero
156. Second law of thermodynamics
181. Boyle’s Law
157. Clausius statement
182. V1/T1=V2/T2
158. Perpetual-motion machine
183. Thickness of material/ thermal conductivity of material
159. Perpetual-motion machine of the first kind 160. Perpetual motion machine of the second kind 161. 1824 162. Sadi Carnot 163. 4 164. Two isothermal and two adiabatic 165. Carnot efficiency
184. 186,000 miles/second 185. Eff = 1 – (T2/T1) 186. EER = 3.42 COP 187. Absorbed heat and work required 188. Law of Dulong and Petit 189. Avogadro’s 190. Perfect gas 191. All of the above
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
192. Amagat’s law
217. Helmholtz free energy
193. Throttling process
218. 0.67 m
194. Joule-Thomson coefficient
219. 0.18 in
195. Sink reservoir
220. 1400 J
196. Isentropic flow
221. Gibbs free energy
197. Ignition temperature
222. heat
198. Dalton’s law
223. relative humidity
199. Joule’s law
224. Sublimation
200. An ideal gas is a gas that is not a superheated vapor
225. Convection 226. change 227. three times
MCQs Part V
228. increases
201. movement of heat
229. no pressure
202. Kelvin
230. the relative humidity decreases
203. heat
231. convection current
204. latent heat
232. blackbody
205. thermal expansion
233. Conduction
206. thermal stress
234. gram-mole
207. Internal Energy
235. Maxwell speed Distribution
208. Specific Heat Capacity
236. Forced Convection
209. Equilibrium Vapor Pressure
237. point function
210. temperature
238. path function
211. Phase diagram
239. boundary
212. Internal Energy
240. control mass
213. calorie
241. control volume
214. temperature
242. -256
215. Zero-Point Energy
243. heat enters the substance.
216. 10 K
244. 15
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
245. shape of the object
269. Clausius statement
246. metals
270. mean free path
247. glass
271. 9.86 x 10^4 N/m^2
248. increases
272. 6 x 10^15 tons
249. Kelvin temperature
273. standard atmospheric pressure
250. reduced by half
274. Pascal’s law 275. Gauge Pressure
MCQs Part VI 251. it increases by a factor of square root of 2
276. 62.4 lb 277. surface tension 278. Torricelli’s Theorem
252. entropy
279. diffusion
253. Isochoric process
280. 1948
254. isobaric
281. dew point
255. increases
282. cycle
256. Closed system
283. Bulk Properties
257. normal boiling point
284. Joule-Thomson process
258. wet steam
285. Otto Cycle
259. flash steam
286. 24.6 J/K
260. dryness fraction
287. conservation of energy
261. thermopile
288. 1700 J
262. any holes in the object expand as well
289. 12 kJ
263. one BTU
291. Sensible heat
264. pressure
292. Joseph Black
265. Sir James Dewar
293. Latent Heat
266. Isobaric
294. Third Law of thermodynamics
267. raising the temp and lowering the temp
295. 1/860 W.h
268. the second law of thermodynamics
290. 17.66 %
296. Polytropic process
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
297. steady flow
323. 286
298. Carnot Cycle
324. Both a & b
299. 733.33 kPa
325. 209 psia
300. Sadi Carnot
326. 416 327. 999 K
MCQs Part VII 301. 13.33 ft^3/lbm 302. 3300 lbf-ft/lbm 303. 24.9 ft^3 304. z = pV/ RT 305. 1.79 kJ/ kg-˚C 306. 2 x10^6 kJ 307. 3.16 kg 308. 1.1577 BTU/lbm-˚R 309. 15.7 BTU 310. 0.179 K/s 311. 4474.23 N 312. 2474.23 N 313. 42.41 ft^3 314. 28.6 psia 315. 108 hp 316. W = mRTln (V2/V1) 317. 1124 cal 318. -364 BTU/lbm 319. 12 kJ 320. 0.02 ft^3/lbm 321. 66 kgf 322. 1000 kgf/m3
328. 3800 329. 1620 °R 330. 0.2148 lb 331. 121 332. 100 333. 125 J 334. 443 kPa 335. 48.75 N 336. 4875 j 337. 300 kJ 338. 1 339. 485 340. 672 341. 298.645 342. 65.23 psi 343. 70 344. 450 N 345. 900,000lb/hr;625 ft/s981 N 346. 981 N 347. T2=1.620ºR, ∫H = 122.83 Btu 348. 70.658 kpa 349. 900,000 lb/hr;625 ft/s 350. 11,772 N-m and 6.26m/s
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
377. 1.356
MCQs Part VIII 351. 10m/s 352. 217.17 kpa 353. 796.32 L 354. 7.85
378. 339.4 K 379. 1620°R 380. 710°R 381. 265.4°C, 430.7kJ/kg, 71.4kJ/kg, 1.0327kJ/(kg)(K),502.1 kJ/kg
355. 375 kg/s
382. 204.2°C, -703.2 kJ/kg, -84.15 kJ/kg, -1.7505 kJ/(kg)(K),-787.4 kJ/kg
356. 87°C
383. 95.20%
357. 0.085 m³/min
384. 95.56%
358. 24m/s
385. 1378.7 kJ
359. 33.9 ft
386. -1384.7 kJ
360. 625 fpm
387. 96%
361. 50 lbm
388. 97.6%,2713 kJ/kg
362. 33.9 ft
389. 14026.5 m³
363. 1.38
390. 126m³
364. -420Btu
391. 54.60%
365. 7.9 °C
392. 190 in³
366. 1.3 x 108 J
393. 217.7 kPa
367. -540 J
394. 62850 joules
368. 0.77 kg liter-1
395. 419 000 joules
369. 11,120N
396. 2238 watts
370. 5.18 l
397. 9 Newton’s
371. 18 kg
398. 0.998 hp
372. 111 psi
399. 1.16 kcal
373. 1214Btu / lb
400. 440 cal
374. 394 lb 375. –1664 kJ/min 376. 7.849 ft3 Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
425. Specific Heat
MCQs Part IX 401. Thermodynamics 402. Boyle’s Law 403. 6.0225 x 10^23 mol-1 404. all of the above 405. isolated system 406. evaporation 407. 1 gm/cm³ 408. when a body is inversed in a fluid, the fluid exerts a upward force on the body whose magnitude is equal to the weight of the displaced fluid.
426. Thermodynamics 427. 1st Law of Energy Conservation 428. Vector Quantity 429. Internal Energy 430. 1.60210 x 10-19 coulomb 431. Boyle's Law 432. Barometer 433. Both a & b 434. Q is positive when heat is rejected by the body or system 435. All of the above 436. Entrophy
409. solid
437. Newton's Law
410. V = C
438. Density
411. specific heat
439. Enthalpy
412. > 1
440. Closed System
413. Law of Conservation of Mass
441. isometric
414. potential energy
442. specific heat
415. elastic work
443. torr
416. Gabriel Daniel Fahrenheit
444. Cp – Cv
417. Anders Celsius
445. Conservation of Energy
418. barometer
446. Isolated System
419. Momentum
447. Enthalpy
420. all of the above
448. Specific Gravity
421. Energy is a scalar quantity
449. kJ / kg.k
422. System
450. Zeroth Law
423. Flow rate 424. Energy Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
477. Specific Weight
MCQs Part X 451. Charle’s Law 452. Heat 453. Reversible 454. Natural Environment 455. The change in entropy is 0 456. kg 457. Surrounding 458. Control Volume 459. Adiabatic 460. Isentropic Process 461. Mass 462. Weight 463. mass is indestructible 464. Internal Energy 465. Work 466. Heat 467. Open System 468. Pa 469. Boyle’s Law 470. Multistaging 471. Relative Humidity 472. Internal Combustion Engine
478. Manometer 479. Process 480. Heat Engine 481. Saturation Temperature 482. Sub cooled Liquid 483. Compressed Liquid 484. Saturated Liquid 485. Vapor 486. Saturated Vapor 487. Superheated Vapor 488. Wet Vapor 489. Critical Point 490. Sensible Heat 491. Latent Heat 492. momentum 493. °C = 5/9 (°F - 32) 494. Kelvin 495. Newton 496. Pascal 497. Degrees of Superheat, °SH 498. Degrees of Sub cooled, °SB 499. Quality, x 500. Percent Moisture, y
473. Humidity ratio
MCQs Part XI
474. Adiabatic Saturation Process 475. Fossil fuel
501. 2
476. Heating Value
502. zero
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
503. Conservation of energy
530. External combustion engine
504. Rankine cycle
531. in equilibrium
505. Phase
532. Rudolf Clausius
506. 1
533. Steam point
507. Extensive property
534. adiabatic
508. Intensive properties
535. Subcooled liquid
509. enthalpy
536. Third law of thermodynamics
510. entropy
537. 84.6
511. Steam point
538. Some heat transfer occurs
512. Triple point
539. process
513. Critical point
540. path
514. Sensible heat
541. Change in temperature is zero
515. Kilocalorie
542. Isolated system
516. high temperature and low pressure
543. Fixed region in space
517. Boyle’s Law
544. Rankine cycle
518. Open system
545. Joule cycle
519. An energy transfer due to temperature difference
546. zero
520. joule 521. the enthalpy of reactants is lower than the enthalpy of products. 522. regelation
547. properties 548. Randomness or disorder 549. Closed system 550. Open system
523. when the gas expands adiabatically 524. zero
MCQs Part XII
525. Heat 526. Becomes negative
551. viscosity
527. zero
552. zero
528. quadruples
553. enthalpy
529. Adiabatic process
554. Gasoline engine
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
555. Carnot engine
583. Kirchoff’s Law
556. Isobaric expansion
584. Caloric Theory
557. Thomas Young
585. Avogadro’s Hypothesis
558. Second law
586. Newton’s Law of Cooling
559. Mollier diagram
587. All of these
560. Compressibility factor
588. Second Law of Thermodynamics
561. Thermal pump
589. 130.08 {(10atm)(10)(32)/(0.0821) (300K)}
562. Isochoric process 563. Gasoline engine 564. Zeroth Law of Thermodynamics 565. Latent Heat of Vaporization 566. isentropic 567. A fixed region in space 568. Ethylene glycol 569. Adiabatic 570. Ideal gas Law 571. Boiling 572. Third Law of Thermodynamics 573. increases
590. Insolation 591. Isobaric 592. effusion 593. All of these 594. Conservation of Energy Principle 595. Two-stroke engine 596. Thrust 597. Turbojet 598. Thermodynamics 599. Brayton Cycle 600. Second law
574. Isothermal 575. Sublimation 576. All of these 577. Luminosity 578. Charles’ Law 579. Loschmidt number 580. Kelvin 581. Black Body Radiation 582. Thermal Radiation
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
Mechanical Engineering MCQ Thermodymics
Swai Singh Godara 9414532268, 9414532269, 9462974849, 9509974849, 8005603009, 8441976502
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