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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

Sulphur dioxide
R-12
Carbon dioxide
Ammonia

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

Pressure in the evaporator
Temperature of the evaporator
Degree of superheat at exit from the evaporator
None of these

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Increases
Decreases
Remains constant
None of these

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

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

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Copper
Brass
Aluminium
Steel

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Refrigeration and Air Conditioning
During cooling and dehumidification, dry bulb temperature

Increases
None of these
Remains constant
Decreases

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MORE MCQ ON Refrigeration and Air Conditioning

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