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In spark ignition engines, the knocking tendency can be decreased by ______________

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In spark ignition engines, the knocking tendency can be decreased by ______________

(a) decreasing compression ratio

(b) controlling intake throttle

(c) controlling ignition timing

(d) adding dopes like tetraethyl lead and ethylene dibromide

The question was posed to me in an interview.

The doubt is from Alternate Fuels in division Conventional and Alternate Fuels of IC Engine

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Right choice is (d) adding dopes like tetraethyl lead and ethylene dibromide

To explain I would say: None.

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