BUET EXAMS Questions 2-4-16

BUET EXAMS SOLID MECHANICS

1. FD, SF SFD, BMD.  BAPEX’16   , GTCL, WASA’14 , PDB 2. Stress Stress strain strain curv curvee for steel, steel, ceramic ceramic and and polymer polymer materi materials. als. BAPEX’16  3. Draw typical typical stress-strain stress-strain diagram diagram of mild steel steel showing showing yield strength strength,, ultimate strength strength and and  breaking strength. GTCL, PDB 4. Draw Draw a Wheatst Wheatstone one bridg bridgee circu circuit. it. How It measure measuress the the strai strain? n?  NWPGCL’15 5. Three Three theories theories of failure failure of ductile ductile materials materials and two theories theories of brittle brittle materials. materials. BAPEX’16  Problems

6. A cantilever cantilever beam beam of cross cross section section area 30mm 30mm x 40mm 40mm to apply apply load 2000N 2000N at free end. end. The length of the beam 0.5m. Find the t he bending stress.  DPDC’14 7. Given elonga elongation tion 20mm, 20mm, original original length length is 2m, P=20N, P=20N, E=20MPa, E=20MPa, G=50GPa. G=50GPa. Find Find the minimum minimum cross section section area of the bar . DPDC’14 8. A stee steell rod rod of 1 cm2 in cross sectional area and 100 cm long is subjected to an axial pull of 2000 kgf. Find the elongation of the rod considering E=200GPa. GTCL, PDB 9. A spherical spherical pressure pressure vessel vessel has an an internal internal pressure pressure of 2 MPa. MPa. The outer outer diameter diameter of the the cylinder is 200 mm and the thickness of the cylinder is 200 mm and the thickness of the cylinder is 10mm. Find the longitudinal stress and hoop stress.  PGCB’11 10. For a material modulus of elasticit y is 200 GPa and Poisson’s ratio is 0.3. 0.3 . Find the modulus of rigidity and bulk modulus.  NWPGCL’15 11. Thin walled cylindrical shape, maximum allowable allowable stress 150 MPa, diameter 50 mm, thickness 0.2mm. Calculate internal pressure? PGCB’15 12. Determine the moment of inertia of the given area ABCDE. WASA’14 13. Given Poisson’s ration 0.3 and E= 200×10 -6 Pa. Calculate bulk modulus and shear modulus of rigidity. WASA’14 14. Given diameter D, thickness t and force P, find shear stress. DPDC’14

DRAWING

15. Drawin Drawing. g.  BAPEX’16   , APSCL,

 DPDC’14 ,

GTCL, NWPGCL14,

 NWPGCL’15 ,  PGCB’15 ,

WASA’14

THERMODYNAMICS, POWERPLANT ENGINEERING, REFRIGERATIONAIRCONDITIONING AIRCONDITIONING AND AUTOMOBILE

16. What is boiler boiler power? power? Convert Convert 1 bhp of boiler boiler into kg/hr. kg/hr. BAPEX’16 

17. Boiler mountings and accessories. Name 3 of those. BAPEX’16   , APSCL, NWPGCL’15 (give 2 examples of them) 18. What is the function of economizer in a boiler? PGCB’15 , GTCL, PDB 19. What is the function of safety valve in a boiler? GTCL, PDB 20. What is the function of baffle in a boiler?  PGCB’15 21. Fouling Factor, importance of it designing boiler. APSCL 22. Mention 5 names of energy storing technologies.  BAPEX’16  23. How do you identify a petrol engine and a diesel engine? GTCL, PDB 24. Define TON of refrigeration. APSCL, PGCB’15 , PDB 25. What is COP of refrigeration? APSCL 26. 1 TON = how many KW?  PGCB’15 27. T-S diagram of a given reheat Rankine cycle. BAPEX’16  28. Draw a steam turbine power plant layout/schematic.  NWPGCL’15  PGCB’15 ,  NWPGCL’15 ) and explain every stage or 29. Draw Rankine cycle T-S diagram. (  describe the different processes involved with it.  PGCB’15 30. Draw a cooling circuit of a car. BAPEX’16  31. Schematic diagram of closed cycle gas turbine and corresponding T-S diagram for single stage intercooling and single stage heating chamber. APSCL 32. Draw a diagram for an open cycle gas turbine of 2 stage reheating and 2 stage intercooling.  NWPGCL’15

33. What are the applications of gas turbine? Describe its advantages over other prime movers such as diesel engine or petrol engine or steam turbine?  PGCB’15 34. P-V and T-S diagram of Carnot and Stirling cycle. APSCL 35. P-V and T-S diagram for steam turbine. APSCL 36. Draw P-V diagram of Otto and Diesel cycle and show their process in the diagram.  DPDC’14 ,  PDB 37. Draw indicator diagram for four stroke SI and CI engine in T-S graph.  NWPGCL’15 38. Write down the important components of air-conditioning.  DPDC’14 39. What is air conditioning?  PGCB’15 40. Difference between air-condition and cooler?  PGCB’15 41. Draw the block diagram of a vapor compression refrigeration system and corresponding p-h and T-S diagram. NWPGCL’15 42. List the main components of a steam power plant.   PDB’15 43. Advantages of gas turbine over steam turbine.  PDB’15 44. Draw schematic diagram of combined cycle power plant.  PDB’15 45. Draw schematic diagram of combined cycle (Rankine-Brayton) and also show the top most and bottom of the cycle.  PGCB’11 46. Draw the T-S Diagram of Vapor-Compression refrigeration cycle.  PDB’15 47. What is cooling tower? Draw schematic diagram. PGCB’11 48. Write the name of chemical reactions used in boiler water treatment. PGCB’11 49. What are the subsystems of a petrol engine? Write about 5 of those. PGCB’15 50. Describe five sub-process of IC engine. PGCB’15 51. Write the chemical sign of Fr134a, Freon 134a. WASA’14 52. What is CCPP? What type of cycle is used in CCPP?  EGCB VIVA’14

53. What is the other name of Joule cycle?  EGCB VIVA’14 54. Draw P-V diagram of Joule cycle.  EGCB VIVA’14 55. Why lubricant and lube oil is used?  EGCB VIVA’14 56. Why lube oil should be changed after certain period of time? EGCB VIVA’14 Problems

57. Given work input 24KJ/Kg, COP 2.45, mass flow rate 2 Kg/s, determine cooling capacity per ton of refrigeration. WASA’14 58. An ice plant produces 100 tons of ice in 24 hrs. If the plant uses water at 20 ℃, find its cooling capacity. Specific heat and latent heat of solidification of water are 4.2 KJ/Kg/K and 334 KJ/Kg respectively. GTCL 59. An air compressor compresses air of 15°C and 1 bar. After compression the pressure becomes 7 bar isentropically. Find the final temperature and work done for this process.  NWPGCL’15 60. A plant’s capacity is 950MW and produced 567000 KW -hr/month. Peak load is 1000MW. Find i) load factor, ii) plant capacity factor. APSCL 61. A vapor compression refrigeration cycle has the cooling capacity of 2 tons. Find the compressor  power it the COP is 3.5. BAPEX’16  62. Calculate the refrigeration tonnage for 3000kg ice from 0°C to 30°C. NWPGCL’15

ENGINEERING METALLURGY

(NOTHING)

HEAT TRANSFER 

63. What is LMTD? Write its equation. BAPEX’16 . 64. What is the difference between evaporation and boiling? Which one occurs on contact surface?  PGCB’15

65. Draw the diagram for counter flow and parallel flow hear exchanger. APSCL. Problems

66. A=2m2, dx=0.02m, T1=400°C, T2= 30°C, K=0.07 W/m/C (MAY BE). Find Q.  DPDC’14 67. Math about finding heat rate, given heat conduction = heat convection. DPDC’14 68. A furnace wall is made up of refractory brick of 300 mm thickness. The inner and outer surfaces of the wall have temperature of 1000°C and 150°C. Find the heat loss per square meter.  PGCB’11

STATICS & DYNAMICS

69. Finding tension of a cable in tension.  BAPEX’16   , DPDC’14 70. Find the relative velocity of the first man. Given 2 people’s and a car’s velocity.  DPDC’14 71. Drawing a free body diagram of a given force system. PGCB’ 15

HYDRAULICS AND FLUID MECHANICS

72. Write two f undamental assumptions in Bernoulli’s equation.  BAPEX’16  73. Write the Bernoulli’s equation for real and ideal fluid and indicate every terms. (GTCL,  APSCL,  NWPGCL’15 , PDB) Is it an energy equation you think? If yes, then explain.  NWPGCL’15

74. What is Newtonian fluid? Give examples. APSCL 75. What is priming? How it is done? APSCL 76. Draw the performance characteristics curves of a centrifugal pump. GTCL, PDB 77. What is the deviation of ideal Rankine cycle and actual Rankine cycle?  PDB’15 78. What is cavitation? What happens when it occurs? EGCB VIVA’14 79. Write the significance of Froude Number, Reynolds Number and Nusselt Number.  NWPGCL’15

Problems

80. A hydraulic machine has flow 8kg/sec, v=10m/s H=10m and efficiency=75%. Find the power of the hydraulic machine.  DPDC’14 81. Math about Buoyancy and floatation. NWPGCL 14 82. A cylinder is of bore 80 mm and 100 mm stroke. If the clearance volume is 70x10^3, what is the air standard efficiency? APSCL 83. A fluid flow with a pressure of 2 MPa and velocity of 1 m/s. In a nozzle it expands and pressure  becomes the atmospheric. Find the velocity after expansion, datum is same. BAPEX’16  84. A centrifugal pump consumes 20 KW electric power. The efficiency is 70%. If the flow rate is 0.75 m3/s, find the diameter of the cylinder and head of the pump.  PGCB’11 85. Calculating the power in horse power of a pump where pressure difference is 20 bar and discharge is 0.1 m3/s.  PGCB’15 86. A centrifugal pump is used to raise water at a height of 100 ft with discharge of 2.0 cusec. The efficiency of the pump is 62%. Find the input horse power of the pump. GTCL, PDB 87. Math related to Bernoulli’s equation and pump power and efficiency. APSCL 88. Mathematical problem about pitot tube with Bernoulli’s equation.  PDB’15 89. Problem about finding pressure difference in a manometer given the density of two fluids and manometric height.  DPDC’14

THEORY OF MACHINE

90. Name 4 types of gears. Mention the application of worm gear.  PGCB’15 91. An automobile car is 600 CC. The engine is 4 cylinder. The stroke length is equal to the bore of the engine. Find the diameter of the cylinder.  PGCB’11

MACHINE DESIGN

92. Name the types of bearing? EGCB VIVA’14

COMPUTER AND PROGRAMMING

93. What is algorithm in computer programming? WASA’14 94. Write an algorithm and/or computer program to find out highest number unsorted in n numbers. WASA’14