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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
An evaporator is also known as

Freezing coil
Chilling coil
Cooling coil
All of these

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

R-12
R-11
Ammonia
R-22

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Refrigeration and Air Conditioning
A refrigerant with the highest critical pressure is

R-12
R-22
Ammonia
R-11

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Refrigeration and Air Conditioning
The boiling point of ammonia is

-77.7°C
-10.5°C
-33.3°C
-30°C

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Refrigeration and Air Conditioning
The relative coefficient of performance is equal to

(Actual C.O.P.) × (Theoretical C.O.P.)
(Theoretical C.O.P.)/ (Actual C.O.P.)
None of these
(Actual C.O.P.) /(Theoretical C.O.P.)

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Refrigeration and Air Conditioning
The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is

Same
More or less depending on ambient conditions
More
Less

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