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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The freezing point of R-12 is

-135.8°C
-107.7°C
-86.6°C
-95.2°C

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Refrigeration and Air Conditioning
The dehumidification process, on the psychrometric chart, is shown by

Curved line
Inclined line
Horizontal line
Vertical line

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Refrigeration and Air Conditioning
Which of the following is not a desirable property of a refrigerant?

Low boiling point
High risibility with oil
Large latent heat
Good electrical conductor

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Refrigeration and Air Conditioning
The thermostatic expansion valve operates on the changes in the

Pressure in the evaporator
Degree of superheat at exit from the evaporator
Temperature of the evaporator
None of these

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Refrigeration and Air Conditioning
The sub-cooling in a refrigeration cycle

None of these
Increases C.O.P.
Does not alter C.O.P.
Decreases C.O.P.

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Refrigeration and Air Conditioning
Which of the following refrigerant has the lowest freezing point?

Ammonia
R-22
R-12
R-11

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MORE MCQ ON Refrigeration and Air Conditioning

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