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Refrigeration and Air Conditioning

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

40 tons
10 tons
0.1 ton
5 tons

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

Total heat lines
Temperature lines
Pressure lines
Entropy lines

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Refrigeration and Air Conditioning
Carbon dioxide is

Odourless
Non-flammable
All of the listed here
Colourless

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

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Refrigeration and Air Conditioning
In aircraft, air refrigeration Cycle is used because of

Higher coefficient of performance
High heat transfer rate
Low temperature at high altitudes
Low weight per tonne of refrigeration

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

Discharge pressure
Suction pressure
Critical pressure
Back pressure

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MORE MCQ ON Refrigeration and Air Conditioning

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