Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

The expansion valve in a refrigerator controls the flow of refrigerant.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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32. 

The relative humidity lines on a psychrometric chart are

A. vertical and uniformly spaced
B. horizontal and uniformly spaced
C. horizontal and non-uniformly spaced
D. curved lines

Answer: Option D

Explanation:

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33. 

The C.O.P. of a heat pump working on a reversed Carnot cycle is

A.
B.
C.
D.

Answer: Option D

Explanation:

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34. 

A vapour absorption refrigeration system

A. gives noisy operation
B. gives quiet operation
C. requires little power consumption
D. cools below 0° C

Answer: Option B

Explanation:

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35. 

The rato of energy transferred by convection to that by conduction is called

A. Stanton number
B. Nusselt number
C. Biot number
D. Peclet number

Answer: Option B

Explanation:

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