Refrigeration and Air Conditioning
Critical temperature is the temperature above which

Water will evaporate
A gas will immediately liquefy
Water will never evaporate
A gas will never liquefy

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Refrigeration and Air Conditioning
Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

These react with oxygen and cause its depletion
These react with plants and cause greenhouse effect
These react with ozone layer
These react with water vapour and cause acid rain

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

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

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Refrigeration and Air Conditioning
Degree of saturation or percentage humidity is

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 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 mass of water vapour present in 1 m³ of dry air

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