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Refrigeration and Air Conditioning

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.

None of these
Equal to
Less than
Greater than

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Refrigeration and Air Conditioning
Mass flow ratio of NH₃ in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of

1: 9
1: 1
9: 1
1: 3

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

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

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Refrigeration and Air Conditioning
The specific humidity during cooling and dehumidification

Decreases
Remains constant
Increases
None of these

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Refrigeration and Air Conditioning
Ammonia is

Highly toxic and inflammable
Non-inflammable
Non-toxic
Toxic and non-inflammable

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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
2.33
3.33

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