Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

The thermal diffusivity for solids is generally less than those for liquids and gases.
A:
True
B:
False
C:
D:
Answer: B
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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: C
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An ordinary passenger aircraft requires a cooling system of capacity.
A:
2 TR
B:
4 TR
C:
8 TR
D:
10 TR
Answer: C
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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: C
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The central air conditioning system has __________ overall efficiency as compared to individual systems.
A:
same
B:
lower
C:
higher
D:
Answer: C
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