Discussion
The flame starts burning away from the tip, this can be corrected by which of following way:
Answer: A
The fault is corrected by reducing the pressure of the gases.
A flame that burns away from the tip (lifting off) shows that the gas is leaving the nozzle faster than the flame can burn back to it. The usual cause is too high a gas pressure for the nozzle size, so lowering the pressure brings the flame back onto the tip.
Cooling the torch and cleaning the orifice are remedies for backfire and flashback, where the flame burns back into the tip. Reducing only the oxygen would change the flame's character rather than its speed.
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