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Theory of Machine

Theory of Machine
Rectilinear motion of piston is converted into rotary by

Cross head
Gudgeon pin
Slider crank
Connecting rod

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Theory of Machine
The pressure angle of a cam depends upon

Offset between center lines of cam and follower
Angle of ascent
All of these
Lift of follower

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Theory of Machine
The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by

ωr₁ sinθ
ω(R - r₁) cosθ
ωR cosθ
ω(R - r₁) sinθ

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Theory of Machine
The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

cosφ - sinα = c/b
cotφ - cotα = c/b
sinφ + sinα = b/c
tanφ + cotα = b/c

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Theory of Machine
When a rigid body is suspended vertically and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

Torsional pendulum
Compound pendulum
Simple pendulum
Second's pendulum

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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
½μWR
²/₃ μWR
¾μWR

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