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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Freon group of refrigerants are

Nontoxic and non-inflammable
Toxic
Non-inflammable and toxic
Inflammable

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Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Evaporator
Receiver
Expansion valve
Compressor discharge

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Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

1 + B.P.F.
1/ B.P.F.
1 - B.P.F.
P.F. - 1

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Refrigeration and Air Conditioning
Refrigeration in aeroplanes usually employs the following refrigerant

Freon-22
Air
CO2
Freon-11

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

25 kJ/kg
50 kJ/kg
125 kJ/kg
100 kJ/kg

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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 evaporator
Condenser to the expansion valve

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MORE MCQ ON Refrigeration and Air Conditioning

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