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

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center
May start and end anywhere
Starts at top dead center and ends at bottom dead center

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Internal Combustion Engines
Compression ratio of I.C. Engines is

Swept volume/cylinder volume
Volume displaced by piston per stroke and clearance volume in cylinder
Ratio of pressure after compression and before compression
The ratio of volumes of air in cylinder before compression stroke and after compression stroke

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