Internal Combustion Engines
In a petrol engine, the mixture has the lowest pressure at the

Beginning of suction stroke
None of these
End of compression stroke
End of suction stroke

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens at bottom dead center and closes at top dead center
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens just after bottom dead center and closes just before top dead center
May open and close anywhere

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