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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In case of sensible cooling of air, the coil efficiency is given by

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

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

Lower than
None of the listed here
Higher than
Same as

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Refrigeration and Air Conditioning
The evolution of heat of solution takes place in ammonia absorption plant when

Weak solution mixes with strong solution
Lithium bromide mixes with ammonia
Ammonia vapour is driven out of solution
Ammonia vapour goes into solution

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Refrigeration and Air Conditioning
In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is

Reversed Carnot cycle
Reversed Joule cycle
Reversed Otto cycle
Reversed Brayton cycle

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Refrigeration and Air Conditioning
The wet bulb depression indicates _________ humidity of the air.

Absolute
Specific
None of these
Relative

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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

2.33
1.33
4.33
3.33

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