Theory of Machine
For dynamic balancing of a shaft

Both (A) and (B)
The net dynamic force acting on the shaft is equal to zero
None of these
The net couple due to the dynamic forces acting on the shaft is equal to zero

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Theory of Machine
In gears, interference takes place when

Gear teeth are undercut
Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gears do not move smoothly in the absence of lubrication

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