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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Less than
Greater than
None of the listed here
Equal to

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Refrigeration and Air Conditioning
The refrigerant supplied to a compressor must be

Dry saturated liquid refrigerant
None of these
Superheated vapour refrigerant
A mixture of liquid and vapour refrigerant

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Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Increases
Remains constant
Decreases
None of these

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

CO2
Freon-22
NH3
Freon-12

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

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

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

R-11
R-12
Ammonia
R-22

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