The duration of the ignition lag in an engine depends on the fact

The duration of the ignition lag in an engine depends on the fact
| The duration of the ignition lag in an engine depends on the factors like

A. chemical nature of fuel

B. mixture ratio

C. electrode gap

D. all the above

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

Concept:

Ignition lag:

  • Ignition lag (the time lag between first igniting of fuel and the commencement of the main phase of combustion) is not a period of inactivity but is a chemical process.
  • The ignite lag in terms of crank angles is 10° and 20° and in terms of time is 0.0015 seconds.
The duration of ignition lag depends on the following factors:

Fuel: 

  • The higher the self-ignition temperature of the fuel, the longer the ignition lag.

Mixture ratio: 

  • Ignition lag is the smallest for the mixture ratio which gives the maximum temperature. This mixture ratio is somewhat richer than the stoichiometric ratio.

Initial temperature and pressure: 

  • Ignition lag are reduced if the initial temperature and pressure are increased (and these can be increased by increasing the compression ratio).

Turbulence: 

  • Ignition lag is not much affected by the turbulence.

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