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Refrigeration and Air Conditioning

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

Compressor
Expansion valve
Evaporator
Condenser

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Refrigeration and Air Conditioning
The operating temperature of a cold storage is -2°C. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. The actual C.O.P. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. The power required to drive the plant is

7.44 kW
3.72 kW
1.86 kW
18.6 kW

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Refrigeration and Air Conditioning
The process, generally used in summer air conditioning to cool and dehumidify the air, is called

Heating and humidification
Cooling and dehumidification
Humidification
Dehumidification

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Refrigeration and Air Conditioning
Presence of moisture in a refrigerant affects the working of

Condenser
Evaporator
Compressor
Expansion valve

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Refrigeration and Air Conditioning
When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

Lowering the higher temperature
Raising the higher temperature
Operating the machine at lower speeds
Operating the machine at higher speeds

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Refrigeration and Air Conditioning
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, is called

Humidity ratio
Degree of saturation
Relative humidity
Absolute humidity

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