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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The Freon group of refrigerants are

Hydrocarbon refrigerants
Inorganic refrigerants
Zoetrope refrigerants
Halocarbon refrigerants

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Refrigeration and Air Conditioning
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as

Mean radiant temperature
Effective temperature
Dew point temperature
None of the listed here

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Refrigeration and Air Conditioning
The freezing point of R-12 is

-95.2°C
-86.6°C
-135.8°C
-107.7°C

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Refrigeration and Air Conditioning
Critical pressure of a liquid is the pressure

Above which liquid becomes vapour
Above which liquid becomes solid
Above which liquid will remain liquid
Above which liquid becomes gas

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Refrigeration and Air Conditioning
The sensible heat factor during the heating and humidification process is given by (where h₁ = Enthalpy of air entering the heating coil, h₂ = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)

(hA - h2)/ (h1 - h2)
(hA - h1)/ (h2 - h1)
(h2 - hA)/ (h1 - h2)
(h1 - h2)/ (hA - h2)

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

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