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
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

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
The maximum fluctuation of energy is the

Ratio of the mean resisting torque to the work-done per cycle
Difference between the maximum and minimum energies
Variations of energy above and below the mean resisting torque line
Sum of the maximum and minimum energies

ANSWER DOWNLOAD EXAMIANS APP