Theory of Machine
The swaying couple is due to the

Secondary unbalanced force
Partial balancing
Two cylinders of locomotive
Primary unbalanced force

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

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

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