Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

The freezing point of R-12 is
A:
-86.6°C
B:
-95.2°C
C:
-107.7°C
D:
-135.8°C
Answer: D
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In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
A:
high pressure saturated liquid
B:
wet vapour
C:
very wet vapour
D:
dry vapour
Answer: A
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The thermostatic expansion valve operates on the changes in the
A:
degree of superheat at exit from the evaporator
B:
temperature of the evaporator
C:
pressure in the evaporator
D:
none of the above
Answer: A
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The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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The capillary tube is not used in large capacity refrigeration systems because
A:
cost is too high
B:
capacity control is not possible
C:
it is made of copper
D:
required pressure drop can not be achieved
Answer: B
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