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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/h
m²/hK
m/hK

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Refrigeration and Air Conditioning
The cooling system used for supersonic aircrafts and rockets is

Bootstrap air cooling system
Simple air cooling system
Reduced ambient air cooling system
Regenerative air cooling system

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Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Higher than
Lower than
Same as
None of these

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Refrigeration and Air Conditioning
The freezing point of sulphur dioxide is

-75.2°C
-135.8°C
-56.6°C
-77.7°C

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Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Copper
Aluminium
Steel
Brass

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Sub-cooling or under-cooling
None of the listed here
Normal cooling
Super-cooling

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