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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-22
Ammonia
R-11
R-12

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Refrigeration and Air Conditioning
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

Low pressure vapour refrigerant
Low pressure liquid and vapour refrigerant
None of these
High pressure liquid refrigerant

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Refrigeration and Air Conditioning
The coefficient of performance is the ratio of the refrigerant effect to the

Heat of compression
Work done by compressor
All of these
Enthalpy increase in compressor

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Refrigeration and Air Conditioning
The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

0.67
0.376
0.6
0.4

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Raising the higher temperature
Lowering the higher temperature
Operating the machine at lower speeds
Operating the machine at higher speeds

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is very wet vapour

After passing through the expansion or throttle valve
Before passing through the condenser
Before entering the compressor
After passing through the condenser

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MORE MCQ ON Refrigeration and Air Conditioning

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