Theory of Machine
A point on a connecting link (excluding end points) of a double slider crank mechanism traces a

Straight line path
Parabolic path
Elliptical path
Hyperbolic path

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

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

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