Engineering :: Heat Engines

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If after some use the lower part, electrodes and beathing space of a spark plug are found coated by deposits of soot and carbon, the conclusion will be

[A].	Spark plug is of proper heat rating	[B].	Composition of mixture in the engine is correct
[C].	Spark plug is of too high heat rating	[D].	Spark advance is incorrect
[E].	Spark plug is short circuited

Answer: Option C

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