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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The higher temperature in vapour compression cycle occurs at

Receiver
Evaporator
Expansion valve
Compressor discharge

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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)

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

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Refrigeration and Air Conditioning
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

Mean radiant temperature
Effective temperature
Dew point temperature
None of the listed here

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Critical pressure of refrigerant
Much above critical pressure
Much below critical pressure
Near critical pressure

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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 higher speeds
Operating the machine at lower speeds

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Refrigeration and Air Conditioning
The refrigerant supplied to a compressor must be

A mixture of liquid and vapour refrigerant
Dry saturated liquid refrigerant
Superheated vapour refrigerant
None of these

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MORE MCQ ON Refrigeration and Air Conditioning

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