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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
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

2.33
3.33
4.33
1.33

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Refrigeration and Air Conditioning
The dry bulb temperature during sensible heating of air

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
In order to collect liquid refrigerant and to prevent it from going to a ________, a device known as accumulator is used at the suction of compressor.

Compressor
Condenser
Evaporator
Expansion valve

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Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m²/hK
m/hK
m/h

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Refrigeration and Air Conditioning
The vertical and uniformly spaced lines on a psychrometric chart indicates

Dew point temperature
Dry bulb temperature
Wet bulb temperature
Specific humidity

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Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

All of these
Sulphur sticks
Halide torch
Soap and water

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MORE MCQ ON Refrigeration and Air Conditioning

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