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REFRIGERATION AND AIR CONDITIONING

Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Less than
None of these
Greater than
Equal to

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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
Carbon dioxide
Brine

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

All of these
Lowers compressor capacity because vapour is lighter
Increases power required per ton of refrigeration
Lowers evaporation temperature

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

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

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Refrigeration and Air Conditioning
The superheating in a refrigeration cycle

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

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