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Refrigeration and Air Conditioning

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

-107.7°C
-86.6°C
-95.2°C
-135.8°C

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Refrigeration and Air Conditioning
A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called

Thermostatic expansion valve
Automatic expansion valve
Low side float valve
High side float valve

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Refrigeration and Air Conditioning
During heating and dehumidification process, dry bulb temperature

Remains constant
Increases
None of these
Decreases

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Refrigeration and Air Conditioning
In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)

1 - B. P.F.
1/ B.P.F.
P.F. - 1
1 + B.P.F.

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Refrigeration and Air Conditioning
Carbon dioxide is

Odourless
Non-flammable
Colourless
All of the listed here

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Refrigeration and Air Conditioning
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid

Before entering the expansion valve
After passing through the expansion or throttle valve
Before passing through the condenser
After passing through the condenser

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