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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant

depends on other factors
remains same
decreases
increases

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Refrigeration and Air Conditioning
The evaporator changes the low pressure liquid refrigerant from the expansion valve into

None of these
Low pressure liquid and vapour refrigerant
Low pressure vapour refrigerant
High pressure liquid refrigerant

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Refrigeration and Air Conditioning
The wet bulb temperature during sensible heating of air

Remains constant
Decreases
None of these
Increases

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Refrigeration and Air Conditioning
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg)

50 kJ/kg
25 kJ/kg
125 kJ/kg
100 kJ/kg

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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

Absolute humidity
Degree of saturation
Humidity ratio
Relative humidity

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Refrigeration and Air Conditioning
If a gas is to be liquefied, its temperature must be

None of these
Reduced to a value below its critical temperature
Equal to critical temperature
Increased to a value above its critical temperature

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