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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of

Copper
Steel
Aluminium
Brass

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Refrigeration and Air Conditioning
Vapour compression refrigeration is somewhat like

Carnot cycle
None of these
Reversed Carnot cycle

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Refrigeration and Air Conditioning
The advantage of dry compression is that

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

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

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

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Refrigeration and Air Conditioning
The specific humidity during humidification process

Increases
None of these
Decreases
Remains constant

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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
Degree of saturation
Relative humidity
Absolute humidity

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