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Refrigeration and Air Conditioning

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

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Refrigeration and Air Conditioning
Pick up the wrong statement. A refrigerant should have

High boiling point
Tow specific heat of liquid
High latent heat of vaporisation
Higher critical temperature

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-30°C
-10.5°C
-77.7°C
-33.3°C

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Refrigeration and Air Conditioning
During humidification process, __________ increases.

Wet bulb temperature
Dry bulb temperature
Specific humidity
Relative humidity

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Refrigeration and Air Conditioning
The C.O.P. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will

May increase or decrease depending on the type of refrigerant used
Increase
Decrease
Remain unaffected

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Refrigeration and Air Conditioning
In which of the following refrigeration system, waste heat can be effectively used?

Vapour absorption cycle
Air refrigeration cycle
Vapour compression cycle
None of the listed here

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