Theory of Machine
The primary unbalanced force is maximum when the angle of inclination of the crank with the line of stroke is

180° and 360°
0° and 90°
0° and 180°
90° and 180°

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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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