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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
The leakage in a refrigeration system using ammonia is detected by

Sulphur sticks
Halide torch
All of these
Soap and water

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

R-11
R-22
R-12
Ammonia

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Refrigeration and Air Conditioning
Chaperon equation is applicable for registration at

Saturation point of liquid
Triple point
Saturation point of vapour
Sublimation temperature

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Refrigeration and Air Conditioning
Carbon dioxide is

All of the listed here
Colourless
Odourless
Non-flammable

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Refrigeration and Air Conditioning
Highest pressure encountered in a refrigeration system should be

Critical pressure of refrigerant
Much below critical pressure
Near critical pressure
Much above critical pressure

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Refrigeration and Air Conditioning
Moisture should be removed from refrigerants to avoid

All of these
Corrosion of steel plates
Freezing at the expansion valve
Restriction to refrigerant flow

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