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Theory of Machine

Theory of Machine
Which of the following is a pendulum type governor?

Porter governor
Watt governor
Hartnell governor
None of these

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Theory of Machine
The tractive force in a locomotive with two cylinders is given by (where c = Fraction of reciprocating parts per cylinder, m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, and θ = Angle of inclination of crank to the line of stroke)

m.ω².r (cosθ - sinθ)
m.ω².r cosθ
m.ω².r sinθ
(1 - c).m.ω².r (cosθ - sinθ)

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Theory of Machine
The size of cam depends upon

Prime circle
Pitch circle
Pitch curve
Base circle

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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)

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

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Theory of Machine
A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by (where μ = tan φ = Coefficient of friction between the plane and the body)

P = W (sin α + μ cos α)
P = W (cos α + μ sin α)
P = W tan (α + φ)
P = W tan α

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Theory of Machine
The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by (where OQ = Distance between the centre of circular flank and centre of nose)

ω² × OQ
ω² × OQ cosθ
ω² × OQ tanθ
ω² × OQ sinθ

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