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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

Less
Equally
More
Unpredictable

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-77.7°C
-33.3°C
-30°C

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Refrigeration and Air Conditioning
The pressure at the inlet of a refrigerant compressor is called

Back pressure
Critical pressure
Discharge pressure
Suction pressure

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

Pressure in the evaporator
None of these
Degree of superheat at exit from the evaporator
Temperature of the evaporator

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

3.5 × C.O.P.
None of these
O.P/3.5
3.5/C.O.P.

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Refrigeration and Air Conditioning
The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.

Same
More
Less
None of these

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