Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.75069444444444
0.37569444444444
0.50069444444444
0.62569444444444

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

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