Theory of Machine
In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

Fluctuation of energy
Maximum fluctuation of energy
None of the listed here
Coefficient of fluctuation of energy

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Theory of Machine
The secondary 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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