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

Correct Answer: Pre-ignition

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.
Bissoy MCQ
#Mechanical Engineering #Internal Combustion Engines (I.C. Engines)

Related Questions

In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have
A Low density
B Low temperature
C Long ignition delay
D All of these
The most accurate ignition system of a spark ignition engine is
A Magneto system
B Battery system
C Electronic control unit system
D Magneto and electronic system
The ignition in a spark ignition engine takes place when the piston is
A Exactly at the T.D.C. position on its compression stroke
B Approaching the T.D.C. position on its compression stroke
C Leaving the T.D.position on its compression stroke
D Approaching the T.D.C. position on its exhaust stroke
The auto ignition in a spark ignition engine means
A Automatic ignition of the charge at the end of compression
B Ignition induced by the passage of a spark
C Ignition of the charge before the passage of flame front
D Ignition induced to supplement the process of normal combustion
The advancing of spark timing in spark ignition engines will _________ knocking tendency.
A Increase
B Reduce
C Not effect
D None of these
A basic difference between the spark ignition engine and the Diesel engine is that the
A Diesel engine compresses air alone instead of an air-fuel mixture
B Air temperature ignites the fuel in the Diesel engine
C Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.on the compression stroke
D All of the above
If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called
A Detonation
B Ignition
C Pre-ignition
D Rumble
Which of the following does not relate to a spark ignition engine?
A Ignition coil
B Spark plug
C Carburettor
D Fuel injector
The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of
A Morse test
B Prony brake test
C Motoring test
D Heat balance test
If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about
A 17 : 1
B 15 : 1
C 13 : 1
D 10 : 1

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