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Refrigeration and Air Conditioning

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

3.33
4.33
1.33
2.33

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Refrigeration and Air Conditioning
The advantage of dry compression is that

It results in high volumetric and mechanical efficiency
All of these
It permits complete evaporation in the evaporator
It permits higher speeds to be used

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Refrigeration and Air Conditioning
Which of the following cycles uses air as the refrigerant?

Stirling
Bell Coleman
Ericson
Carnot

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Refrigeration and Air Conditioning
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

High pressure liquid refrigerant
Low pressure liquid and vapour refrigerant
None of these
Low pressure vapour refrigerant

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Refrigeration and Air Conditioning
A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is

Ammonia
Freon
Brine
Carbon dioxide

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 - (1/C.O.P)
1 - C.O.P.
1 + C.O.P
1 + (1/C.O.P)

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