Question

What are the characteristics of good CI engine fuel?

(a) High octane number

(b) Very high cetane number

(c) Short ignition lag

(d) Short ignition lag, high cetane number, and high octane number

The question was posed to me in a national level competition.

This key question is from Conventional Fuels topic in portion Nonconventional Engines, Conventional Energy Sources & Cooling System of Automobile Engineering

Answer 1

Right option is (c) Short ignition lag

To explain I would say: Short ignition lags are the characteristics of good CI engine fuel. The CI engine fuel should be volatile in the operating range of temperature to produce good mixing and combustion.