The ignition of the charge by some hot surface within the engine before the passage of spark is called

A. Pre-ignition

B. Detonation

C. Ignition delay

D. Auto-ignition

Answer: Option A

Solution(By Examveda Team)

The ignition of the charge by some hot surface within the engine before the passage of spark is called Pre-ignition. Pre-ignition is a situation in which the fuel-air mixture in a spark ignition engine ignites before the timed spark, because of contact with a hot surface.