Discussion
Backfire, a small explosion of flame occurring at the tip torch in oxy-acetylene process is due to :
Answer: D
Backfire can be caused by any of the above.
Backfire is a sharp pop at the torch tip, with the flame going out and perhaps relighting. It happens when the gas mixture leaves the tip more slowly than the flame burns back towards it, or when the tip is disturbed. Each listed cause does this: gas pressure set too low makes the gas flow too slow, an overheated nozzle ignites the mixture inside the tip, and carbon deposits blocking the orifice disturb the flow.
Because all three are recognised causes, no single option is complete on its own.
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