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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The unit of thermal diffusivity is

m²/h
m/hK
m/h
m²/hK

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Refrigeration and Air Conditioning
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called

Relative humidity
Humidity ratio
Absolute humidity
Degree of saturation

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

Higher than
None of the listed here
Lower than
Same as

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Refrigeration and Air Conditioning
Cooling water is required for following equipment in ammonia absorption plant

Condenser
Absorber
Evaporator
Condenser, absorber and separator (rectifier)

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Refrigeration and Air Conditioning
The emissivity of a polished silver body is ____ as compared to black body.

High
Low
Same
Very low

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Refrigeration and Air Conditioning
During heating and humidification, the final relative humidity of air

Can be lower or higher than that of the entering air
Is higher than that of the entering air
None of the listed here
Is lower than that of the entering air

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