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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
As relative humidity decreases, the dew point temperature will be ___ wet bulb temperature.

Same as
Lower than
None of the listed here
Higher than

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Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

Increases C.O.P.
Decreases C.O.P.
None of these
Does not alter C.O.P.

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

Compressor
Expansion valve
Condenser
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
Heating and humidification
Humidification
Dehumidification

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Refrigeration and Air Conditioning
Nusselt number (NN) is given by

NN = μ cp/k
NN = V²/t.cp
NN = hl/k
NN = ρ V l /μ

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Refrigeration and Air Conditioning
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

Takes place at constant pressure
Takes place at constant temperature
Involves no change in volume
Takes place at constant entropy

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