Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these
The algebraic sum of the secondary forces must be equal to zero

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Theory of Machine
The maximum fluctuation of energy is the

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

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