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)

The primary unbalanced force due to inertia of reciprocating parts in

1.	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)
A.	m.ω².r sinθ
B.	m.ω².r cosθ
C.	m.ω².r (sin 2θ/n)
D.	m.ω².r (cos 2θ/n)
Answer» C. m.ω².r (sin 2θ/n)

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