Theory of Machine
The ratio of maximum fluctuation of speed to the mean speed is called

None of these
Fluctuation of speed
Maximum fluctuation of speed
Coefficient of fluctuation of speed

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

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Theory of Machine
Effort of a governor is the

None of these
Mean force exerted at the sleeve for maximum equilibrium speed
Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed

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Theory of Machine
A body is said to be under forced vibrations, when

There is a reduction in amplitude after every cycle of vibration
None of these
A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement

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