Internal Combustion Engines
In order to mix air and petrol in the required proportion and to supply it to the engine during suction stroke, then ___ is employed.

None of the listed here
Carburettor
Injector
Fuel pump

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

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