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

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

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Theory of Machine
The inversion of a mechanism is

Obtained by fixing different links in a kinematic chain
Turning its upside down
Obtained by reversing the input and output motion
Changing of a higher pair to a lower pair

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