Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
16F/ 3πd²
6F/ πd²
4F/ πd²

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Machine Design
Crowning on pulley helps

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

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