Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

16. 

The operating temperature of a cold storage is - 2° C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40° C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

A. 1.86 kW
B. 3.72 kW
C. 7.44 kW
D. 18.6 kW

Answer: Option D

Explanation:

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17. 

In chemical dehumidification process,

A. dew point temperature decreases
B. wet bulb temperature decreases
C. dry bulb temperature increases
D. all of these

Answer: Option D

Explanation:

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18. 

A one tonne refrigerating machine means that

A. one tonne is the total mass of machine
B. one tonne refrigerant is used
C. one tonne of water can be converted into ice
D. one tonne of ice when melts from and at 0° C in 24 hours, the refrigeration effect is equivalent to 210 kJ/min

Answer: Option D

Explanation:

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19. 

The air cooling system mostly used in transport type aircrafts is

A. simple air cooling system
B. simple evaporative air cooling system
C. boot-strap air cooling system
D. all of these

Answer: Option C

Explanation:

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20. 

The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0).

A. True
B. False

Answer: Option A

Explanation:

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