Theory of Machine
The dynamic friction is the friction experienced by a body, when the body

Is at rest
None of these
Is in motion
Just begins to slide over the surface of the other body

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

None of these
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
The algebraic sum of the secondary forces must be equal to zero
Both (A) and (B)

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