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

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

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Internal Combustion Engines
In a coil ignition system of petrol engines, a condenser is connected across the contact breaker in order to

Cause more rapid break of the primary current, giving a higher voltage in the secondary circuit
None of these
Prevent sparking across the gap between the points
Both (A) and (B)

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Internal Combustion Engines
Flash point of fuel oil is

Indicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off
Temperature at which it catches fire without external aid
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals

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