Theory of Machine
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

Minimum and maximum
Zero and maximum
Zero and minimum
Maximum and zero

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Theory of Machine
The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Effects of unbalances are proportional to the square of the speed
Unbalanced forces are not dangerous at higher speeds
Effects of unbalances are directly proportional to the speed
Unbalanced couples are caused only at higher speeds

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Average tension of the tight side and slack side of the belt
Sum of the tensions on the tight side and slack side of the belt
Tension in the slack side of the belt
Tension in the tight side of the belt

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