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The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the
Options:
A .  Unbalanced couples are caused only at higher speeds
B .  Unbalanced forces are not dangerous at higher speeds
C .  Effects of unbalances are proportional to the square of the speed
D .  Effects of unbalances are directly proportional to the speed
Answer: Option C

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