Theory of Machine
For dynamic balancing of a shaft

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

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Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
Increase belt and pulley life
In decreasing the slip of the belt
For automatic adjustment of belt position so that belt runs centrally

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