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Theory of Machine

Theory of Machine
A pantograph is a mechanism with

Rolling pairs
Lower pairs
Higher pairs
Turning pairs

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Theory of Machine
The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

135° and 315°
270° and 360°
0° and 90°
90° and 180°

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Theory of Machine
The frequency of oscillation of a torsional pendulum is

r/2πk. √(g/l)
r/2πk. √(l/g)
2πk/r. √(g/l)
2πr/k. √(g/l)

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Theory of Machine
Angular acceleration of a link can be determined by dividing the

Centripetal component of acceleration with length of link
Resultant acceleration with length of link
All of these
Tangential component of acceleration with length of link

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Theory of Machine
A spring controlled governor is said to be unstable when the controlling force

Increases as the radius of rotation increases
Remains constant for all radii of rotation
Increases as the radius of rotation decreases
Decreases as the radius of rotation increases

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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)

¾μWR
μwr
½μWR
²/₃ μWR

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