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Theory of Machine

Theory of Machine
Any point on a link connecting double slider crank chain will trace a

Parabola
Ellipse
Straight line
Circle

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Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Robert's mechanism
Grasshopper mechanism
Watt's mechanism
All of these

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Theory of Machine
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of bigger gear is

4
2
3
5

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Theory of Machine
For simple harmonic motion of the of follower, a cosine curve represents

Displacement diagram
Velocity diagram
Acceleration diagram
All of these

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Theory of Machine
A shaft has an attached disc at the centre of its length. The disc has its centre of gravity located at a distance of 2 mm from the axis of the shaft. When the shaft is allowed to vibrate in its natural bow-shaped mode, it has a frequency of vibration of 10 rad/s. When the shaft is rotated at 300 r.p.m., it will whirl with a radius of

2.50 mm
3.0 mm
2.22 mm
2 mm

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Theory of Machine
The natural frequency of free transverse vibrations due to uniformly distributed load acting over a simply supported shaft is (where δS = Static deflection of simply supported shaft due to uniformly distributed load)

0.4985/ √δS
0.6253/ √δS
0.571/ √δS
0.5615/ √δS

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