Theory of Machine
The method of direct and reverse cranks is used in engines for

The control of speed fluctuations
Vibration analysis
Kinematic analysis
Balancing of forces and couples

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Theory of Machine
Kinematic pairs are those which have

Surface contact between the two elements when in motion
Two elements that permit relative motion
Point or line contact between the two elements when in motion
Elements of pairs not held together mechanically

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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

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

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