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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In a refrigeration cycle, the flow of refrigerant is controlled by

Expansion valve
Condenser
Compressor
Evaporator

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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

4.33
3.33
2.33
1.33

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Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

Is lower than that of the entering air
Can be lower or higher than that of the entering air
Is higher than that of the entering air
None of the listed here

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Refrigeration and Air Conditioning
In S.J. unit, one ton of refrigeration is equal to

210 kJ/ min
21 kJ/ min
840 kJ/ min
420 kJ/ min

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

Equal to critical temperature
Increased to a value above its critical temperature
None of these
Reduced to a value below its critical temperature

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Refrigeration and Air Conditioning
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is

More than or equal to 3.65 kg
Less than 2 kg
More than 10 kg
There is no such consideration

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