Question

Which among the following increases with speed which in turn improves the rate of combustion?

(a) Enthalpy

(b) Turbulence

(c) Vaccum

(d) Entropy

I had been asked this question in quiz.

This is a very interesting question from Ignition Advance in chapter Conventional Ignition System of Automotive Engine Design

Answer 1

Correct option is (b) Turbulence

Easy explanation: For engines with higher speed requires more ignition advancement but the turbulence increases with speed, which improves the rate of combustion, requiring lesser advance. The net requirement, however, remains the increased advance at higher speed.