Theory of Machine
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

ω² r {(n - 1)/n}
ω² r {(n + 1)/n}
ω² r {n/(n + 1)}
ω² r {n/(n - 1)}

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

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

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