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

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

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Internal Combustion Engines
Which one of the following engines will have heavier flywheel than the remaining ones?

30 kW four-stroke petrol engine running at 1500 r.p.m.
30 kW two-stroke diesel engine running at 750 r.p.m.
30 kW two-stroke petrol engine running at 1500 r.p.m.
30 kW four-stroke diesel engine running at 750 r.p.m.

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