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

Both (A) and (B)
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

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Internal Combustion Engines
Which one of the following event would reduce volumetric efficiency of a vertical compression ignition engine?

Inlet valve opening before top dead center
Inlet valve closing before bottom dead center
Exhaust valve closing after top dead center
Inlet valve closing after bottom dead center

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

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

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