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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The COP of a domestic refrigerator

Is less than 1
Is equal to 1
Depends upon the make
Is more than 1

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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)

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

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

Frosting evaporator
None of these
Defrosting evaporator
Non-frosting evaporator

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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
4.33
3.33
2.33

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Refrigeration and Air Conditioning
The boiling point of ________ is 10.5°C.

Ammonia
R-12
Sulphur dioxide
Carbon dioxide

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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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MORE MCQ ON Refrigeration and Air Conditioning

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