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

None of these
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

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Theory of Machine
The primary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r (sin 2θ/n)
m.ω².r sinθ
m.ω².r cosθ
m.ω².r (cos 2θ/n)

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