Machine Design
Pitch point of a cam is

Any point on the pitch circle
A point on the pitch curve having maximum pressure angle
Any point on the pitch curve
A point on the pitch curve having minimum pressure angle

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Machine Design
Crowning on pulley helps

To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
In increasing the slip of the belt
To increase pulley life

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