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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

remains same
depends on other factors
increases
decreases

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Refrigeration and Air Conditioning
The temperature of ammonia after compression in a vapour compression system is

20 to 50°C
None of these
70 to 110°C
50 to 70°C

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Refrigeration and Air Conditioning
The power per tonne of refrigeration is

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

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

NH3
Freon-22
Freon-12
CO2

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Expansion valve to the evaporator
Evaporator to the thermostat
Condenser to the expansion valve
Condenser to the evaporator

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Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Work done by compressor
All of these
Heat of compression
Enthalpy increase in compressor

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MORE MCQ ON Refrigeration and Air Conditioning

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