Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning

36.
The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.

37.
In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
it considerably reduces mass of the system
it improves the C.O.P., as the condenser is small
the positive work in isentropic expansion of liquid is very small
it leads to significant cost reduction
Answer: Option
Explanation:
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38.
The unit of overall coefficient of heat transfer is
W/m2K
W/m2
W/mK
W/m
Answer: Option
Explanation:
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39.
Most thermostatic expansion valves are set for a superheat of
5°C
10°C
15°C
20°C
Answer: Option
Explanation:
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40.
For large tonnage (more than 200 TR) air-conditioning applications, the compressor recommended is
reciprocating
rotating
centrifugal
screw
Answer: Option
Explanation:
No answer description is available. Let's discuss.