Internal Combustion Engines
Pre-ignition is caused by the spontaneous combustion of the mixture before the end of the compression stroke, and is due to

Red hot carbon deposits on cylinder walls
Any one of the listed here
Overheated spark plug points
Cylinder walls being too hot

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Internal Combustion Engines
Which one of the following engines will have heavier flywheel than the remaining ones?

30 kW four-stroke diesel engine running at 750 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW four-stroke petrol engine running at 1500 r.p.m.

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Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
Temperature and pressure in the cylinder at the time of injection
All of these
Relative velocity between the fuel injection and air turbulence pressure of residual gases

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