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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The wet bulb temperature at 100% relative humidity is ________ dew point temperature.

Same as
Higher than
None of these
Lower than

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Refrigeration and Air Conditioning
A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

4.33
1.33
3.33
2.33

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Refrigeration and Air Conditioning
In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively

Ammonia and water
Water and water
Water and lithium bromide
Ammonia and lithium bromide

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Refrigeration and Air Conditioning
Carbon dioxide is

Colourless
All of the listed here
Odourless
Non-flammable

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

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Refrigeration and Air Conditioning
Air refrigeration cycle is used in

Air conditioning
Gas liquefaction
Commercial refrigerators
Domestic refrigerators

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