Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

According to Prevost's theory of exchanges, every body irrespective of its temperature continuously emit heat radiations to the surrounding bodies and at the same time receives heat radiations from the surrounding bodies.
A:
True
B:
False
C:
D:
Answer: A
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The thermostatic expansion valve is used in __________ type of evaporators.
A:
flooded
B:
DX coil
C:
dry
D:
Answer: C
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If a gas is to be liquified, its temperature must be
A:
increased to a value above its critical temperature
B:
reduced to a value below its critical temperature
C:
equal to critical temperature
D:
none of the above
Answer: C
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When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
A:
positive
B:
negative
C:
zero
D:
none of these
Answer: B
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The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.
A:
same
B:
lower
C:
higher
D:
Answer: C
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