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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
During a refrigeration cycle, heat is rejected by the refrigerant in a

Evaporator
Expansion valve
Compressor
Condenser

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Refrigeration and Air Conditioning
The temperature of air recorded by a thermometer, when its bulb is surrounded by a wet cloth exposed to the air, is called

Dew point temperature
Wet bulb temperature
None of these
Dry bulb temperature

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Refrigeration and Air Conditioning
A vapour absorption refrigeration system

Gives noisy operation
Cools below 0°C
Gives quiet operation
Requires little power consumption

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Refrigeration and Air Conditioning
A standard ice point temperature corresponds to the temperature of

Water at 0°C
Solid and dry ice
Ice at 4°C
Mixture of ice and water under equilibrium conditions

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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
100 kJ/kg
125 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
Humidity ratio
Relative humidity
Degree of saturation

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