Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36. 

The central air conditioning system has __________ overall efficiency as compared to individual systems.

A. same
B. lower
C. higher

Answer: Option C

Explanation:

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37. 

The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

A. Wien's law
B. Stefan's law
C. Kirchhoff's law
D. Planck's law

Answer: Option C

Explanation:

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38. 

An ordinary passenger aircraft requires a cooling system of capacity.

A. 2 TR
B. 4 TR
C. 8 TR
D. 10 TR

Answer: Option C

Explanation:

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39. 

In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

A. reversed Carnot cycle
B. reversed Joule cycle
C. reversed Brayton cycle
D. reversed Otto cycle

Answer: Option C

Explanation:

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40. 

The thermal diffusivity for solids is generally less than those for liquids and gases.

A. True
B. False

Answer: Option B

Explanation:

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