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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Brass
Steel
Copper
Aluminium

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Refrigeration and Air Conditioning
Wet bulb temperature is the temperature of air recorded by a thermometer, when

None of these
The moisture present in it begins to condense
Its bulb is surrounded by a wet cloth exposed to the air
It is not affected by the moisture present in the air

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Refrigeration and Air Conditioning
In a refrigeration system, the expansion device is connected between the

Evaporator and compressor
Condenser and receiver
Compressor and condenser
Receiver and evaporator

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

Air
Freon-11
CO2
Freon-22

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

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

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Defrosting evaporator
None of these
Frosting evaporator
Non-frosting evaporator

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