Internal Combustion Engines
In a four stroke cycle petrol engine, the charge is ignited at

30° after top dead center
30° before bottom dead center
30° before top dead center
30° after bottom dead center

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Internal Combustion Engines
The injector nozzle of a compression ignition engine is required to inject fuel at a sufficiently high pressure in order to

Inject fuel at a high velocity to facilitate atomization
All of these
Ensure that penetration is not high
Inject fuel in a chamber of high pressure at the end of compression stroke

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