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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant total heat lines
Constant temperature lines
Constant pressure lines
Constant entropy lines

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Refrigeration and Air Conditioning
In a pressure enthalpy chart, the space to the left of the saturated liquid line represents

None of the listed here
Wet vapour region
Sub-cooled liquid region
Superheated vapour region

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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

More
Same
Less
More/less depending on rating

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Refrigeration and Air Conditioning
The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents

Evaporation of the refrigerant liquid
Metering of the refrigerant liquid
Condensation of the refrigerant vapour
Compression of the refrigerant vapour

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Refrigeration and Air Conditioning
The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called

Coefficient of performance of heat pump
Relative coefficient of performance
Refrigerating efficiency
Coefficient of performance of refrigeration

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Refrigeration and Air Conditioning
A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

Water temperature being high
All of these
Dirty condenser surface
Lack of cooling water

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MORE MCQ ON Refrigeration and Air Conditioning

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