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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Atmospheric pressure
56 bars
Slightly above atmospheric pressure
24 bars

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Refrigeration and Air Conditioning
One of the purposes of sub cooling the liquid refrigerant is to

Reduce compressor overheating
Ensure that only liquid and not the vapour enters the expansion (throttling) valve
Increase cooling effect
Reduce compressor discharge temperature

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

All of these
Water coolers
Room air conditioners
Domestic refrigerators

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Refrigeration and Air Conditioning
Pick up the wrong statement. A refrigerant should have

Higher critical temperature
High boiling point
High latent heat of vaporisation
Tow specific heat of liquid

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Refrigeration and Air Conditioning
Which of the following refrigerant is highly toxic and flammable?

Carbon dioxide
Sulphur dioxide
Ammonia
R-12

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

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

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