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The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as ____________

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The ignition of charge by some hot surface in the engine cylinder before operation of spark plug is known as ____________

(a) auto ignition

(b) pre-ignition

(c) detonation

(d) none of the mentioned

I had been asked this question in an international level competition.

My doubt stems from Comparision of Air Cycle and Fuel Cycle topic in portion Fuel Air and Actual Cycles and their Analysis of IC Engine

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The correct option is (b) pre-ignition

The explanation is: Pre-ignition is defined as the ignition of charge by some hot surface in the engine cylinder before operation of spark plug.

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