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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature during sensible cooling of air

Decreases
Remains constant
None of these
Increases

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Refrigeration and Air Conditioning
Absorption system normally uses the following refrigerant

CO2
Freon-22
Freon-11
Ammonia

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Refrigeration and Air Conditioning
In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity of refrigerant for system is

More than 10 kg
Less than 2 kg
More than or equal to 3.65 kg
There is no such consideration

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Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

All of these
Room air conditioners
Domestic refrigerators
Water coolers

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Refrigeration and Air Conditioning
As relative humidity decreases, the dew point temperature will be ___ wet bulb temperature.

Higher than
Same as
None of the listed here
Lower than

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

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