Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36.
The central air conditioning system has __________ overall efficiency as compared to individual systems.
same
lower
higher
Answer: Option
Explanation:
No answer description is available. Let's discuss.

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
Wien's law
Stefan's law
Kirchhoff's law
Planck's law
Answer: Option
Explanation:
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38.
An ordinary passenger aircraft requires a cooling system of capacity.
2 TR
4 TR
8 TR
10 TR
Answer: Option
Explanation:
No answer description is available. Let's discuss.

39.
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is
reversed Carnot cycle
reversed Joule cycle
reversed Brayton cycle
reversed Otto cycle
Answer: Option
Explanation:
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40.
The thermal diffusivity for solids is generally less than those for liquids and gases.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.