Theory of Machine
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

Smallest link is a fixed link
Slider is a fixed link
Longest link is a fixed link
Coupler link is fixed

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Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

All points of the disc have the same velocity
The point on the disc making contact with the plane surface has zero acceleration
The centre of the disc has centrifugal acceleration
The centre of the disc has zero acceleration

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