Question

Higher cetane number means a ___________ delay period and smoother engine operation.

(a) higher

(b) lower

(c) normal

(d) none of the mentioned

I have been asked this question in class test.

This key question is from Delay Period in section Combustion and Combustion Chambers of IC Engine

Answer 1

The correct answer is:

(b) lower

A higher cetane number indicates a lower delay period and smoother engine operation. Fuels with a higher cetane number ignite more easily and quickly, which reduces the delay period between injection and ignition, leading to more efficient and smoother engine performance.