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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The coefficient of performance of Heat Pump is always ___ one.

Greater than
Equal to
None of the listed here
Less than

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Refrigeration and Air Conditioning
The condition of refrigerant as it leaves the compressor in a vapour compression system is

Wet vapour
Dry saturated vapour
Superheated vapour
Saturated liquid

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Sulphur dioxide
R-12
Carbon dioxide
Ammonia

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Pressure lines
Temperature lines
Total heat lines
Entropy lines

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Refrigeration and Air Conditioning
A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

1 kW
2 kW
3 kW
4 kW

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Refrigeration and Air Conditioning
The bank of tubes at the back of domestic refrigerator is

Condenser tubes
Refrigerant cooling tubes
Evaporator tubes
Capillary tubes

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