Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

None of these
m₁ m₂ = r₁ r₂
m₁ r₂ = m₂ r₁
m₁ r₁ = m₂ r₂

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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 secondary forces must be equal to zero
None of these
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

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