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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

Fluorine
Ammonia
Sulphur dioxide
Carbon dioxide

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

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

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Refrigeration and Air Conditioning
The difference between dry bulb temperature and dew point temperature, is called

Degree of saturation
Wet bulb depression
Dry bulb depression
Dew point depression

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Refrigeration and Air Conditioning
A refrigerant compressor is used to

All of these
Circulate the refrigerant through the refrigerating system
Raise the pressure of the refrigerant
Raise the temperature of the refrigerant

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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)

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

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Refrigeration and Air Conditioning
Presence of moisture in a refrigerant affects the working of

Evaporator
Expansion valve
Condenser
Compressor

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