Theory of Machine
Oldham's coupling is the

Second inversion of single slider crank chain
Third inversion of slider crank chain
Third inversion of double slider crank chain
Second inversion of double slider crank chain

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

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