Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

The sensible heat during humidification process decreases.

A. True
B. False

Answer: Option B

Explanation:

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32. 

According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

A. directly proportional to the surface area
B. directly proportional to the difference of temperatures between the two bodies
C. either (a) or (b)
D. both (a) and (b)

Answer: Option D

Explanation:

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33. 

The freezing point of carbon dioxide is equal to boiling point of R-12.

A. Correct
B. Incorrect

Answer: Option B

Explanation:

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34. 

The condition of refrigerant as it leaves the compressor in a vapour compression system is

A. saturated liquid
B. wet vapour
C. dry saturated vapour
D. superheated vapour

Answer: Option D

Explanation:

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35. 

The super-heating 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 C

Explanation:

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