Theory of Machine
The direction of linear velocity of any point on a link with respect to another point on the same link is

At 45° to the link joining the points
None of the listed here
Perpendicular to the link joining the points
Parallel to the link joining the points

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Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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

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