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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
3.33
4.33
2.33

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Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

Freon-12
CO2
Freon-22
NH3

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Refrigeration and Air Conditioning
A vapour absorption refrigerator uses _________ as a refrigerant.

Ammonia
Water
Aqua-ammonia
Freon

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Refrigeration and Air Conditioning
During adiabatic saturation process on unsaturated air ___ remains constant.

Relative humidity
Wet bulb temperature
Dew point temperature
Dry bulb temperature

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Water and lithium bromide
Ammonia and lithium bromide
Water and water

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

R-22
R-11
Ammonia
R-12

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MORE MCQ ON Refrigeration and Air Conditioning

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