Internal Combustion Engines
If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

Geometric similarity
Kinematic similarity
None of these
Dynamic similarity

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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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