Question

Increase in compression ratio ___________ delay period.

(a) increases

(b) reduces

(c) unpredictable

(d) none of the mentioned

This question was addressed to me by my school teacher while I was bunking the class.

Question is from Delay Period topic in section Combustion and Combustion Chambers of IC Engine

Answer 1

The correct answer is:

(b) reduces

An increase in compression ratio typically reduces the delay period. This is because higher compression ratios lead to higher temperatures and pressures inside the cylinder, which helps the fuel to ignite more quickly, thereby shortening the delay period before combustion.