Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

31. 

While designing the refrigeration system of an aircraft, the prime consideration is that the

A. system has high C.O.P.
B. power per TR is low
C. mass of refrigerant circulated in the system is low
D. mass of the refrigeration equipment is low

Answer: Option D

Explanation:

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32. 

The heat transfer takes place according to

A. Zeroth law of thermodynamics
B. First law of thermodynamics
C. Second law of thermodynamics
D. Kirchhoff's law

Answer: Option C

Explanation:

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33. 

An electrolux refrigerator is called a __________ absorption system.

A. single fluid
B. two fluids
C. three fluids

Answer: Option C

Explanation:

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34. 

The heat transfer by radiation __________ a medium.

A. requires
B. does not require

Answer: Option B

Explanation:

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35. 

Thermal conductivity of water __________ with rise in temperature.

A. remains same
B. decreases
C. increases
D. may increase or decrease depending upon temperature

Answer: Option D

Explanation:

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