Refrigeration and Air Conditioning
The advantage of dry compression is that

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

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Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

The mass of water vapour present in 1 m³ of dry air
The mass of water vapour present in 1 kg of dry air
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

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Refrigeration and Air Conditioning
The bypass factor of a cooling coil decreases with

Decrease in fin spacing and decrease in number of rows
Increase in fin spacing and increase in number of rows
Decrease in fin spacing and increase in number of rows
Increase in fin spacing and decrease in number of rows

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