Exercise: Heat Transfer Refrigeration And Air Conditioning

Questions for: Heat Transfer Refrigeration And Air Conditioning

For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
A:
reciprocating
B:
rotating
C:
centrifugal
D:
screw
Answer: C
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Most thermostatic expansion valves are set for a superheat of
A:
5°C
B:
10°C
C:
15°C
D:
20°C
Answer: A
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The unit of overall coefficient of heat transfer is
A:
W/m2K
B:
W/m2
C:
W/mK
D:
W/m
Answer: A
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In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
A:
it considerably reduces mass of the system
B:
it improves the C.O.P., as the condenser is small
C:
the positive work in isentropic expansion of liquid is very small
D:
it leads to significant cost reduction
Answer: C
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The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
A:
True
B:
False
C:
D:
Answer: A
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