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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

DX coil
Flooded
Dry
None of these

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Refrigeration and Air Conditioning
The material of pipe lines for a system using Freon as a refrigerant should be

Aluminium
Brass
Steel
Copper

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-10.5°C
-33.3°C
-77.7°C
-30°C

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Refrigeration and Air Conditioning
In vapour compression cycle the condition of refrigerant is superheated vapour

Before entering the expansion valve
After passing through the condenser
After passing through the expansion or throttle valve
Before passing through the condenser

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Refrigeration and Air Conditioning
Where does the lowest temperature occur in a vapour compression cycle?

Expansion valve
Evaporator
Compressor
Condenser

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Refrigeration and Air Conditioning
The relative coefficient of performance is

None of these
Theoretical COP/actual COP
Actual COP/theoretical COP
Actual COP × theoretical COP

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