Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

The coefficient of performance of a domestic refrigerator is __________ as compared to a domestic air-conditioner.

A. same
B. less
C. more

Answer: Option B

Explanation:

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32. 

The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

A. move actually
B. do not move actually
C. affect the intervening medium
D. does not affect the intervening medium

Answer: Option B

Explanation:

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33. 

The human body feels comfortable when the heat stored in the body is

A. positive
B. negative
C. zero
D. none of these

Answer: Option C

Explanation:

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34. 

A Bell Coleman refrigerator working on dense air system as compared to open air system, for the same range of temperature, results in __________ power per tonne of refrigeration.

A. same
B. lower
C. higher

Answer: Option B

Explanation:

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35. 

The amount of heat flow through a body by conduction is

A. directly proportional to the surface area of the body
B. directly proportional to the temperature difference on the two faces of the body
C. inversely proportional to the thickness of the body
D. all of the above

Answer: Option D

Explanation:

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