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Refrigeration and Air Conditioning

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

Remains constant
None of these
Decreases
Increases

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Refrigeration and Air Conditioning
The refrigerant used in small tonnage commercial machines (hermetically sealed units) is

Carbon dioxide
R-12
Ammonia
Sulphur dioxide

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Refrigeration and Air Conditioning
The vapour pressure of refrigerant should be

Higher than atmospheric pressure
Equal to atmospheric pressure
Could be anything
Lower than atmospheric pressure

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Refrigeration and Air Conditioning
One tonne of refrigeration (1TR) means that the heat removing capacity is

21 kJ/min
620 kJ/min
420 kJ/min
210 kJ/min

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

None of the listed here
Same as
Higher than
Lower than

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

After passing through the condenser
Before entering the expansion valve
Before passing through the condenser
After passing through the expansion or throttle valve

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MORE MCQ ON Refrigeration and Air Conditioning

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