Study Set Content:
1. Find the work possess for a helium gas at 20°C.
A. 609 kJ/kg
B. 168 kJ/kg
C. 229 kJ/kg
D. 339 kJ/kg
A. 609 kJ/kg
2. Two kilogram of gas is confined in a 1 m3 tank at 200 kPa and 88°C. What type of gas is in the
tank?
A. Helium
B. Ethane
C. Methane
D. Ethene
B. Ethane
4. Compute the mass of a 2 m3 propane at 280 kPa and 40°C.
A. 6.47 kg
B. 5.1 kg
C. 10.20 kg
D. 9.47 kg
D. 9.47 kg
5. Compute the air flow in ft³ /min of mechanical ventilation required to exhaust an
accumulation of refrigerant due to leaks of the system capable of revolving air from the
machinery for a mass of 4 lbs refrigerant.
A. 200
B. 210
C. 220
D. 230
A. 200
7. A 29.53” x 39.37” pressure vessel contains ammonia with f = 0.041. Compute the minimum required discharge capacity of the relief device in kg/hr.
A. 106.71 kg/hr
B. 108.71 kg/hr
C. 110.71 kg/hr
D. 112.71 kg/hr
C. 110.71 kg/hr
8. Compute the maximum length of the discharge pipe installed on an outlet of a pressure-relief device in feet for internal pipe diameter of 0.5 inch and rated discharge capacity is 8 lb/min of air. The rated pressure of relief valve is 10 psig.
A. 0.286 ft
B. 0.386 ft
C. 0.486 ft
D. 0.586 ft
A. 0.286 ft
9. A thermal power plant has the heat rate of 11,363 Btu/kW-hr. Find the thermal efficiency of the plant.
A. 28%
B. 30%
C. 34%
D. 40%
B. 30%
10. What is the hydraulic gradient of a 1 mile, 17 inches inside diameter pipe when 3300
gal/min of water flow with f = 0.03?
37.7 ft
A. 0.00714
B. 0.00614
C. 0.00234
D. 0.00187
A. 0.00714
11. Find the loss of head in the pipe entrance if speed of flow is 10 m/s.
A. 5.10 m
B. 10.2 m
C. 17.4 m
D. 2.55 m
D. 2.55 m
12. Wet material, containing 220% moisture (dry basis), is to be dried at a rate of 1.5 kg/s in a continuous dryer to give a product containing 10% (dry basis). Find the moisture removed in kg/hr.
A. 3543.75 kg/hr
B. 3513.75 kg/hr
C. 3563.75 kg/hr
D. 3593.75 kg/hr
A. 3543.75 kg/hr
13. Copra enters a dryer containing 70% moisture and leaves 7% moisture. Find the moisture removed on each pound of solid in the final product.
A. 6.258 lbs
B. 1.258 lbs
C. 4.258 lbs
D. 2.258 lbs
D. 2.258 lbs
14. A 1 m x 1.5 m cylindrical tank is full of oil with SG = 0.92. Find the force acting at the bottom of the tank in dynes.
A. 106.33 x 10³
dynes
C. 106.33 x 10⁵
dynes
B. 106.33 x 10⁴
dynes
D. 106.33 x 10⁶
dynes
D. 106.33 x 10⁶ dynes
15. Find the pressure at the 100 fathom depth of water in kPa.
A. 1,793.96 kPa
B. 1,893.96 kPa
C. 1,993.96 kPa
D. 1,693.96 kPa
A. 1,793.96 kPa
16. Find the depth in furlong of the ocean (SG = 1.03) if the pressure at the sea bed is 2,032.56 kPa. h=201.158 m
A. 1
B. 2
C. 3
D. 4
A. 1
17. Find the mass of 10 quartz of water.
A. 10.46 kg
B. 9.46 kg
C. 11.46 kg
D. 8.46 kg
B. 9.46 kg
18. Find the mass of carbon dioxide having a pressure of 20 psia at 200°F with 10 ft³
volume.
A. 1.04 lbs
B. 1.14 lbs
C. 1.24 lbs
D. 1.34 lbs
C. 1.24 lbs
19. Find the heat needed to raise the temperature of water from 30°C to 100°C with 60% quality. Consider an atmospheric pressure of 101.325 kPa. Use the approximate enthalpy formula of liquid.
A. 293.09 kJ/kg
B. 1,772.90 kJ/kg
C. 1,547.90 kJ/kg
D. 1,647.29 kJ/kg
D. 1,647.29 kJ/kg
20. Find the enthalpy of water at 212°F and 14.7 psi if the dryness factor is 30%. Use the
approximate enthalpy formula of liquid.
A. 461 Btu/lb
B. 471 Btu/lb
C. 481 Btu/lb
D. 491 Btu/lb
B. 471 Btu/lb
21. An air compressor consumed 1200 kW-hr per day of energy. The electric motor driving the compressor has an efficiency of 80%. If indicated power of compressor is 34 kW, find the mechanical efficiency of the compressor.
A. 117.65%
B. 75%
C. 85%
D. 90%
C. 85%
22. A refrigeration system consumed 28,800 kW-hr per month of energy. There is 20% of
energy lost due to the cooling system of the compressor and the motor efficiency is 90%. If the COP of the system is 6, find the mechanical efficiency of the compressor.
RE = 172.8 kW
A. 43.15 TR
B. 46.15 TR
C. 49.15 TR
D. 41.15 TR
C. 49.15 TR
