Theory of Machine
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Tip of the gear tooth and flank of pinion
Tip of both gear and pinion
Flanks of both gear and pinion
Tip of the pinion and flank of gear

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

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