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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

depends on other factors
decreases
remains same
increases

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Refrigeration and Air Conditioning
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

Less
More
More/less depending on rating
Same

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Refrigeration and Air Conditioning
A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. The Carnot coefficient of performance of cycle will be

5
0.2
1.2
6

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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
Ammonia and lithium bromide
Water and lithium bromide
Water and water

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Refrigeration and Air Conditioning
The evaporator used in household refrigerators is

None of these
Frosting evaporator
Non-frosting evaporator
Defrosting evaporator

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Refrigeration and Air Conditioning
In mechanical refrigeration system, the refrigerant has the maximum temperature

Before expansion valve
Between condenser and evaporator
Between compressor and condenser
In evaporator

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MORE MCQ ON Refrigeration and Air Conditioning

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