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Due to which of the following there are carbon deposits on the spark plug?

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in Automotive Engine Design by (137k points)
Due to which of the following there are carbon deposits on the spark plug?

(a) Overheating of plug

(b) Burning of fuel on the plug

(c) Erosion of electrodes

(d) Engine speed

This question was addressed to me in exam.

My question is taken from Conventional Ignition System in division Conventional Ignition System of Automotive Engine Design

1 Answer

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Correct choice is (b) Burning of fuel on the plug

The explanation is: The carbon deposits due to the burning of petrol on the spark plug are recognized by their black color and dry, fluffy nature. The main cause for this is due to a defective fuel system delivering extra rich mixture.

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