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Refrigeration and Air Conditioning

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

Expansion valve
Condenser
Compressor
Evaporator

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Refrigeration and Air Conditioning
The process, generally used in winter air-conditioning to warm and humidity the air, is called

Cooling and dehumidification
Humidification
Heating and humidification
Dehumidification

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Refrigeration and Air Conditioning
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is

50
100
20
Zero

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Refrigeration and Air Conditioning
Short horizontal lines on pressure-enthalpy chart show

Constant pressure lines
Constant temperature lines
Constant entropy lines
Constant total heat lines

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

Freezing at the expansion valve
All of these
Corrosion of steel plates
Restriction to refrigerant flow

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Refrigeration and Air Conditioning
The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases,

Will be lower
May be higher or lower depending upon the nature of non-condensable gases
Will remain unaffected
Will be higher

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