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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The C.O.P. of a heat pump working on a reversed Carnot cycle is

T₂/(T₂ - T₁)
(T₁ - T₂)/T₁
(T₂ - T₁)/T₁
T₁/(T₂ - T₁)

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Corrosion of steel plates
Restriction to refrigerant flow
All of these
Freezing at the expansion valve

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Brayton cycle
Reversed Joule cycle
Reversed Carnot cycle
Reversed Otto cycle

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Refrigeration and Air Conditioning
The condition of refrigerant after passing through the condenser in a vapour compression system is

Dry saturated vapour
Wet vapour
Superheated vapour
Saturated liquid

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

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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

1.33
2.33
3.33
4.33

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