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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The undesirable property of a refrigerant is

Non-toxic
Non-explosive
Non-flammable
High boiling point

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Refrigeration and Air Conditioning
In a reversed Brayton cycle, the heat is absorbed by the air during

Isentropic expansion process
Constant pressure cooling process
Isentropic compression process
Constant pressure expansion process

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Refrigeration and Air Conditioning
Reducing suction pressure in refrigeration cycle

Lowers evaporation temperature
All of these
Increases power required per ton of refrigeration
Lowers compressor capacity because vapour is lighter

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

Lower than
None of the listed here
Same as
Higher than

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Refrigeration and Air Conditioning
A refrigerant compressor is used to

Raise the pressure of the refrigerant
Raise the temperature of the refrigerant
Circulate the refrigerant through the refrigerating system
All of these

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Refrigeration and Air Conditioning
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, is called

Humidity ratio
Relative humidity
Absolute humidity
Degree of saturation

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