Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

41. 

During a refrigeration cycle, heat is rejected by the refrigerant in a

A. compressor
B. condenser
C. evaporator
D. expansion valve

Answer: Option B

Explanation:

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42. 

A refrigeration system

A. removes heat from a low temperature body and delivers it to a high temperature body
B. removes heat from a high temperature body and delivers it to a low temperature body
C. rejects energy to a low temperature body
D. none of the above

Answer: Option A

Explanation:

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43. 

The subcooling in a refrigeration cycle

A. does not alter C.O.P.
B. increases C.O.P.
C. decreases C.O.P.
D. none of these

Answer: Option B

Explanation:

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44. 

Nusselt number (NN) is given by

A.
B.
C.
D.

Answer: Option A

Explanation:

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45. 

During sensible cooling of air __________ decreases.

A. wet bulb temperature
B. relative humidity
C. dry bulb temperature
D. specific humidity

Answer: Option C

Explanation:

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