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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

1.33
2.33
4.33
3.33

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

7.44 kW
1.86 kW
18.6 kW
3.72 kW

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Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant pressure lines
Constant total heat lines
Constant entropy lines
Constant temperature lines

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

Greater than
Less than
Equal to
None of the listed here

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Refrigeration and Air Conditioning
The pressure at the outlet of a refrigerant compressor is called

Discharge pressure
Back pressure
Critical pressure
Suction pressure

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Refrigeration and Air Conditioning
Rating of a domestic refrigerator is of the order of

5 tons
10 tons
40 tons
0.1 ton

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