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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
In S.J. unit, one ton of refrigeration is equal to

420 kJ/ min
210 kJ/ min
840 kJ/ min
21 kJ/ min

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Refrigeration and Air Conditioning
For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is ________ that for counter flow.

Equal to
Less than
None of these
Greater than

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Refrigeration and Air Conditioning
The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

Sub-cooling or under-cooling
Super-cooling
None of the listed here
Normal cooling

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Refrigeration and Air Conditioning
Most air cooled condensers are designed to operate with a temperature difference of

5°C
8°C
14°C
22°C

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

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

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-30°C
-77.7°C
-33.3°C
-10.5°C

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MORE MCQ ON Refrigeration and Air Conditioning

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