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Refrigeration and Air Conditioning

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

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

All of these
Freezing at the expansion valve
Corrosion of steel plates
Restriction to refrigerant flow

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Refrigeration and Air Conditioning
Freon group of refrigerants are

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

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Lower than
Same as
Higher than
None of these

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

Vapour compression
Electrolux refrigerator
Carnot cycle
Vapour absorption

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Refrigeration and Air Conditioning
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is

More than 10 kg
There is no such consideration
Less than 2 kg
More than or equal to 3.65 kg

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