Internal Combustion Engines
In a four stroke cycle diesel engine, the inlet valve

May open and close anywhere
Opens at 20° before top dead center and closes at 40° after bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at top dead center and closes at bottom dead center

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Internal Combustion Engines
The tangential velocity of the water element having a free vortex is

Inversely proportional to its (distance)2 from the centre
Inversely proportional to its distance from the centre
Directly proportional to its distance from the centre
Directly proportional to its (distance)2 from the centre

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

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

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