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A nozzle expands air isentropically from 400 deg C and 2 MPa to the atmosphere at 80 kPa. If the inlet velocity is small, what exit velocity, in m/s can be expected? A. 500 B. 600

2.

The hot-wire anemometer is used to measure A. pressure in liquids gas velocities

@ 3.

Colloidal solutions can be purified by washing B. distillation

A. 4.

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900

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1200

D

ordinary filtration

pressure in gases wind velocities at airports

@dialysis

Water flows in a 2 by 4 em rectangular duct at 16 m/s. The duct undergoes a transition to a 6 em diameter pipe. Calculate the velocity in the pipe. A. 2.76 m/s B. 3.14 m/s C. 3.95 m/s 4.53 m/s

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5.

6.

The particle inside the nucleus is called A. nucleic B. nuclons

D.

nuclei

How many coulombs are required to deposit 0.10 gran} of zinc, the atomic mass of zinc being 65.38 and its valence 2? 308 295 C. 275 D. 328

A. 7.

@nucleons

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If the pressure drop in a 100-m section of horizontal 10-cm diameter galvanized-iron pipe is 200 kPa, estimate the flow rate if water at 20 deg C is flowing. A. 0.018 mA3/s B. 0.027 mA3/s 0.033 mA/s D. 0.041 ml\3/s

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8.

A pump is required to lift 200 gallons of water per minute from a well 20 deep and eject it with a speed of 30 ftlsec. What horsepower engine is needed? 1.72 hp B. 2.56 hp C. 1.56 hp D. 3.63 hp

® 9.

During a polytropic process, 10 lb of an ideal gas, whose R = 40 ft-lbf/lbm-deg R and cP = 0.25 BTU/ lbf/lbm-deg R changes state from 20 psia and 40 deg F to 120 psia and 340 deg F. Determine flU. A. 750.5 BTU B. 585.5 BTU C. 780.8 BTU D. 595.8 BTU

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10. How many grams are there in 0.01 mole of Na 2 S0 4 ? A. 7.1 g B. 14.2 g

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9.6 g

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1.42 g

11. A heat pump provides 75 MJ/h to a house. If the compressors require an electrical energy input of 4 kW, calculate the COP. A. 6.24 5.21 C. 4.26 D. 8.26

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12. What is the change in entropy of a gas if the temperature increases from 100 K to 101 K when heat is added and the volume is kept constant? A.

0.250 J/mole-K

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