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Theory of Machine

Theory of Machine
The number of links in pantograph mechanism is equal to

5
4
2
3

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Theory of Machine
The condition for correct steering of a Davis steering gear is (where α = Angle of inclination of the links to the vertical)

cosα = c/b
cotα = c/2b
sinα = b/c
tanα = c/2b

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Theory of Machine
The equation of motion for a single degree of freedom system with viscous damping is 4(dx²/dt²) + 9(dx/dt) + 16x. The damping ratio of the system is

44082
9/128
44090
30195

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Theory of Machine
When the two elements of a pair have __________ when in motion, it is said to a lower pair.

None of these
Body contact
Line or point contact
Surface contact

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Theory of Machine
The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

(R - r₁) (1 - sinθ)
R (1 - cosθ)
R (1 - sinθ)
(R - r₁) (1 - cosθ)

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Theory of Machine
The frictional torque transmitted in a flat pivot bearing, assuming uniform wear, is(Where μ = Coefficient of friction, W=Load over the bearing, R=Radius of bearing)

μwr
¾μWR
½μWR
²/₃ μWR

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