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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During humidification process, __________ increases.

Specific humidity
Wet bulb temperature
Relative humidity
Dry bulb temperature

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Refrigeration and Air Conditioning
For unsaturated air, the dew point temperature is __________ wet bulb temperature.

Equal to
More than
Less than
None of these

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Refrigeration and Air Conditioning
The mass of water vapour present in __________ is called absolute humidity.

1 m3 of water
1 m3 of dry air
1 kg of wet air
1 kg of dry air

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Liquid
Saturated liquid
Wet vapour
Sub-cooled liquid

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

R-12
Carbon dioxide
Ammonia
Sulphur dioxide

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be lower
Will be higher
May be higher or lower depending upon the nature of non-condensable gases
Will remain unaffected

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