Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

26. 

Which of the following represents a heat pump?

A.
B.
C.
D.

Answer: Option B

Explanation:

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27. 

In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be

A. 0.3
B. 0.6
C. 0.67
D. 1.5

Answer: Option B

Explanation:

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28. 

The amount of radiation mainly depends upon the

A. nature of the body
B. temperature of the body
C. type of surface of the body
D. all of these

Answer: Option D

Explanation:

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29. 

For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

A. copper
B. aluminium
C. steel
D. brass

Answer: Option C

Explanation:

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30. 

The highest thermal diffusivity is of

A. iron
B. lead
C. concrete
D. wood

Answer: Option B

Explanation:

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