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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Wet bulb temperature
Dew point temperature
Dry bulb temperature
Relative humidity

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

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

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Refrigeration and Air Conditioning
The humidification process, on the psychrometric chart is shown by

Vertical line
Curved line
Horizontal line
Inclined line

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Refrigeration and Air Conditioning
R-12 is generally preferred over R-22 in deep freezers since

It is miscible with oil over large range of temperatures
All of these
It gives higher coefficient of performance
It has low operating pressures

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Refrigeration and Air Conditioning
In vapour compression cycle the condition of refrigerant is superheated vapour

After passing through the condenser
After passing through the expansion or throttle valve
Before entering the expansion valve
Before passing through the condenser

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Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

Decrease
Remain unaffected
May increase or decrease depending on the type of refrigerant used
Increase

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