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
The algebraic sum of the secondary forces must be equal to zero
None of these
Both (A) and (B)

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Theory of Machine
The magnitude of velocities of the points on a rigid link is

Directly proportional to the distance from the points to the instantaneous center and is parallel to the line joining the point to the instantaneous center
Inversely proportional to the distance from the points to the instantaneous center and is perpendicular to the line joining the point to the instantaneous center
Inversely proportional to the distance from the points to the instantaneous center and is parallel to the line joining the point to the instantaneous center
Directly proportional to the distance from the points to the instantaneous center and is perpendicular to the line joining the point to the instantaneous center

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