Internal Combustion Engines
The voltage required to produce a spark across the gap, between the sparking points is

10,000 to 12,000 volts
2000 to 4000 volts
4000 to 6000 volts
6000 to 10,000 volts

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

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

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