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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The thermostatic expansion valve is used in ________ type of evaporators.

DX coil
Flooded
None of these
Dry

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Refrigeration and Air Conditioning
The advantage of dry compression is that

It results in high volumetric and mechanical efficiency
It permits complete evaporation in the evaporator
It permits higher speeds to be used
All of these

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

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

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

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

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Water and water
Ammonia and lithium bromide
Water and lithium bromide

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Refrigeration and Air Conditioning
The curved lines on a psychrometric chart indicates

Dry bulb temperature
Dew point temperature
Relative humidity
Wet bulb temperature

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