Question

Dieseling may take place due to ___________

(a) sticking of throttle

(b) requirement of tune up of engine and oil entry into the cylinder

(c) none of the mentioned

(d) all of the mentioned

This question was addressed to me in an interview for job.

This interesting question is from Systems In Modern Carburetors in portion Carburetion of IC Engine

Answer 1

Correct option is (d) all of the mentioned

Explanation: Dieseling may take place due to engine idling speed set to high, increase in compression ratio due to carbon deposits, inadequate or low octane rating, engine overheating, too high spark plug heat range, incorrect adjustment of idle fuel-air mixture, sticking of throttle, requirement of tune up of engine and oil entry into the cylinder.