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Refrigeration and Air Conditioning

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

Increases
Decreases
None of these
Remains constant

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Refrigeration and Air Conditioning
The air cooling system mostly used in transport type aircrafts is

Bootstrap air cooling system
Simple air cooling system
All of the listed here
Simple evaporative air cooling system

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Refrigeration and Air Conditioning
The heat rejection factor (HRF) is given by

1 + C.O.P
1 - (1/C.O.P)
1 - C.O.P.
1 + (1/C.O.P)

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Freezing at the expansion valve
Restriction to refrigerant flow
Corrosion of steel plates
All of these

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-95.2°C
-86.6°C
-135.8°C
-107.7°C

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

Wet bulb temperature
Dry bulb temperature
Dew point temperature
None of these

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MORE MCQ ON Refrigeration and Air Conditioning

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