Theory of Machine
In a four-bar chain it is required to give an oscillatory motion to the follower for a continuous rotation of the crank. For the lengths of 50 mm of crank and 70 mm of the follower, determine theoretical maximum length of coupler. The minimum length of the coupler will be

Slightly less than 45 mm
45 mm
95 mm
Slightly more than 45 mm

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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?

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

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