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Theory of Machine

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

Cross head
Slider crank
Gudgeon pin
Connecting rod

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Theory of Machine
When two pulleys of different diameters are connected by means of an open belt, the angle of contact at the ________ pulley must be taken into consideration.

None of the listed here
Larger
Smaller
Smaller OR Larger

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Theory of Machine
The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where ω = Angular velocity of the cam shaft)

ω (r₁ r₂) cosθ
ω (r₁ + r₂) sinθ sec2θ
ω (r₁ r₂) sinθ
ω (r₁ + r₂) cosθ cosec2θ

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Theory of Machine
The example of spherical pair is

Lead screw of a lathe
Ball and socket joint
Bolt and nut
Ball bearing and roller bearing

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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

30195
9/128
44082
44090

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Theory of Machine
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω₁ rad/s in the clockwise direction and the link OB turns with angular velocity ω₂ rad/s in the anticlockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)

(ω₁ - ω₂) r
ω₁.ω₂.r
(ω₁ - ω₂) 2r
(ω₁ + ω₂) r

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