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°
90° and 180°
0° and 180°

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Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
For automatic adjustment of belt position so that belt runs centrally
Increase belt and pulley life
In decreasing the slip of the belt

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