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

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

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Refrigeration and Air Conditioning
The bypass factor for a cooling coil

Decreases with increase in velocity of air passing through it
May increase or decrease with increase in velocity of air passing through it depending upon the condition of air entering
Increases with increase in velocity of air passing through it
Remains unchanged with increase in velocity of air passing through it

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