Theory of Machine
In order to give the primary balance of the reciprocating parts of a multi-cylinder inline engines

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

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Theory of Machine
The maximum fluctuation of energy is the

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
Difference between the maximum and minimum energies

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