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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
Equal to
Greater than
None of these

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-95.2°C
-86.6°C
-107.7°C

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Refrigeration and Air Conditioning
Condensing temperature in a refrigerator is the temperature

Of evaporator
Of cooling medium
Of freezing zone
At which refrigerant gas becomes liquid

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Refrigeration and Air Conditioning
The lowest temperature during the cycle in a vapour compression system occurs after

Evaporation
Compression
Condensation
Expansion

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Evaporator tubes
Condenser tubes
Refrigerant cooling tubes
Capillary tubes

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

None of these
(Actual C.O.P.) × (Theoretical C.O.P.)
(Theoretical C.O.P.)/ (Actual C.O.P.)
(Actual C.O.P.) /(Theoretical C.O.P.)

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