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Refrigeration and Air Conditioning

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

Steel
Copper
Brass
Aluminium

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Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

Does not alter C.O.P.
Decreases C.O.P.
Increases C.O.P.
None of these

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

1.2
6
5
0.2

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Higher than
None of these
Same as
Lower than

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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

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

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

quiet operation
cooling below 0°C
very little power consumption
noisy operation

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