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

Inversely proportional to its distance from the centre
Directly proportional to its (distance)2 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
The purpose of testing an internal combustion engine is

To conform the data used in design, the validity of which may be doubtful
To satisfy the customer regarding the performance of the engine
All of these
To determine the information, which cannot be obtained by calculations

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