Theory of Machine
Balancing of rotating and reciprocating parts of an engine is necessary when it runs at

Slow speed
Any one of these
Moderate speed
Highs peed

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Theory of Machine
The maximum fluctuation of energy is the

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

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