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Refrigeration and Air Conditioning

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

All of these
Halide torch
Sulphur sticks
Soap and water

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Refrigeration and Air Conditioning
The C.O.P. of a Carnot refrigerator in winter will be _________ as compared to C.O.P. in summer.

None of these
Lower
Higher
Same

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant pressure
Takes place at constant temperature
Involves no change in volume
Takes place at constant entropy

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Refrigeration and Air Conditioning
The horizontal and non-uniformly spaced lines on a psychrometric chart indicates

Dew point temperature
Wet bulb temperature
Dry bulb temperature
Specific humidity

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Constant pressure expansion process
Constant pressure cooling process
Isentropic expansion process
Isentropic compression process

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes vapour
Above which liquid becomes gas
Above which liquid becomes solid
Above which liquid will remain liquid

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