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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

CO2
NH3
Freon-22
Freon-12

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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
Decrease
Increase

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Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Atmospheric pressure
24 bars
Slightly above atmospheric pressure
56 bars

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

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

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Refrigeration and Air Conditioning
One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice

In 12 hours
In 24 hours
In 1 minute
In 1 hour

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

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

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