Theory of Machine
The example of completely constrained motion is a

Motion of a shaft with collars at each end in a circular hole
Motion of a piston in the cylinder of a steam engine
All of these
Motion of a square bar in a square hole

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

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