Refrigeration and Air Conditioning
The leaks in a refrigeration system using Freon are detected by

Halide torch which on detection produces greenish flame lighting
Using reagents
Sulphur sticks which on detection gives white smoke
Smelling

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Refrigeration and Air Conditioning
Dry bulb temperature is the temperature of air recorded by a thermometer, when

The moisture present in it begins to condense
Its bulb is surrounded by a wet cloth exposed to the air
None of the listed here
It is not affected by the moisture present in the air

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