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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

1.33
4.33
3.33
2.33

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Evaporation of the refrigerant liquid
Condensation of the refrigerant vapour
Compression of the refrigerant vapour
Metering of the refrigerant liquid

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Refrigeration and Air Conditioning
Most of the domestic refrigerators work on the following refrigeration system

Vapour absorption
Vapour compression
Carnot cycle
Electrolux refrigerator

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Other factors decide C.O.P
Increases C.O.P
Decreases C.O.P
O.P remains unaltered

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Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Condenser
Absorber
Condenser, absorber and separator (rectifier)
Evaporator

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

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

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