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Refrigeration and Air Conditioning

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

Equal to
Less than
Greater than
None of the listed here

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Refrigeration and Air Conditioning
The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

(T₁ - T₂)/T₁
T₂/ (T₂ - T₁)
(T₂ - T₁)/T₁
T₁ / (T₂ - T₁)

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Refrigeration and Air Conditioning
Air refrigerator works on

None of these
Both (A) and (B)
Bell Coleman cycle
Reversed Carnot cycle

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
125 kJ/kg
100 kJ/kg
25 kJ/kg

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-77.7°C
-56.6°C
-135.8°C
-75.2°C

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Gas liquefaction
Air conditioning
Commercial refrigerators
Domestic refrigerators

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