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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
Aluminium
Copper

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Refrigeration and Air Conditioning
Presence of moisture in a refrigerant affects the working of

Expansion valve
Condenser
Compressor
Evaporator

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Refrigeration and Air Conditioning
In which of the following refrigeration system, waste heat can be effectively used?

None of the listed here
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Much below critical pressure
Critical pressure of refrigerant
Much above critical pressure
Near critical pressure

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Refrigeration and Air Conditioning
As relative humidity decreases, the dew point temperature will be ___ wet bulb temperature.

Same as
Lower than
None of the listed here
Higher than

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Reduces power consumption
Increases heat transfer
Increases power consumption
Improves C.O.P. of the system

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