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
Absolute humidity
Humidity ratio
Degree of saturation

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Refrigeration and Air Conditioning
Which of the following statement is correct?

The wet bulb temperature is a measure of enthalpy of moist air
All of the listed here
The wet bulb and dry bulb temperature are equal at saturation condition
The constant enthalpy lines are also constant wet bulb temperature lines

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Refrigeration and Air Conditioning
One ton of the refrigeration is

The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours
The standard unit used in refrigeration problems
The refrigeration effect to produce 1 ton of ice at NTP conditions
The cooling effect produced by melting 1 ton of ice

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