Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m2). The critical thickness of insulation will be
A:
25 mm
B:
40 mm
C:
160 mm
D:
800 mm
Answer: A
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The emissive power of a body depends upon its
A:
temperature
B:
physical nature
C:
wave length
D:
all of these
Answer: D
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The unit of Stefan-Boltzmann constant is
A:
Watt/mK
B:
Watt/m2K2
C:
Watt/m2K4
D:
Watt/mK2
Answer: C
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Which of the following refrigerant is highly toxic and flammable?
A:
Ammonia
B:
Carbon dioxide
C:
Sulphur dioxide
D:
R-12
Answer: A
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A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be
A:
1.33
B:
2.33
C:
3.33
D:
4.33
Answer: B
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