Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

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
The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure
The mass of water vapour present in 1 kg of dry air
The mass of water vapour present in 1 m³ of dry air

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Refrigeration and Air Conditioning
In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature

Which is lower than the dew point temperature of the incoming stream
Of adiabatic saturation of incoming stream
Which lies between the wet bulb and dew point temperatures of the incoming stream
Which lies between the dry bulb and wet bulb temperatures of the incoming stream

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Refrigeration and Air Conditioning
The reciprocating refrigerant compressors are very suitable for

Large displacements and low condensing pressures
Small displacements and high condensing pressures
Small displacements and low condensing pressures
Large displacements and high condensing pressures

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