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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Decreases C.O.P
O.P remains unaltered
Increases C.O.P
Other factors decide C.O.P

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Refrigeration and Air Conditioning
An important characteristic of absorption system of refrigeration is

cooling below 0°C
noisy operation
very little power consumption
quiet operation

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Refrigeration and Air Conditioning
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

5.12
1
1.25
2.15

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

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

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Refrigeration and Air Conditioning
The capillary tube, as an expansion device, is used in

Room air conditioners
Domestic refrigerators
All of these
Water coolers

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Refrigeration and Air Conditioning
If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be

Same
Less
More
More/less depending on rating

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MORE MCQ ON Refrigeration and Air Conditioning

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