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Preignition can be caused due to presence of ______

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Preignition can be caused due to presence of ______

(a) excess lubricants in cylinder

(b) gum in fuel

(c) over-heated spark plug

(d) higher volume of air in air fuel mixture

The question was posed to me at a job interview.

Question is from Working Principle of Battery Ignition System in section Ignition and Power Transmission of Farm Machinery

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Correct choice is (c) over-heated spark plug

Explanation: Pre-ignition is a condition or situation in which the fuel and air mixture in spark plugin ignites before the timed spark and this can happen due to contact with hot surface. So, if the spark plug is over heated or its tip is too hot, it can result in pre-ignition.

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