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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

Freon-11
CO2
Ammonia
Freon-22

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Refrigeration and Air Conditioning
Superheating in a refrigeration cycle

O.P remains unaltered
Other factors decide C.O.P
Decreases C.O.P
Increases C.O.P

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Refrigeration and Air Conditioning
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

Unpredictable
Equally
More
Less

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Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

None of these
The moisture present in it begins to condense
It is not affected by the moisture present in the air
Its bulb is surrounded by a wet cloth exposed to the air

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Refrigeration and Air Conditioning
In a domestic vapour compression refrigerator, the refrigerant commonly used is

All of these
R-12
Ammonia
CO?

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

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

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