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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Allowable pressure on high pressure side or ammonia absorption system is of the order of

Slightly above atmospheric pressure
Atmospheric pressure
24 bars
56 bars

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Refrigeration and Air Conditioning
Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?

Fluorine
Sulphur dioxide
Carbon dioxide
Ammonia

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Refrigeration and Air Conditioning
In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the

Condenser to the evaporator
Expansion valve to the evaporator
Condenser to the expansion valve
Evaporator to the thermostat

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

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

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Refrigeration and Air Conditioning
The formation of frost on cooling coils in a refrigerator

Increases heat transfer
Increases power consumption
Reduces power consumption
Improves C.O.P. of the system

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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
1.25
1
2.15

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