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

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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

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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

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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

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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

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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

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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%

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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%

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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

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