Machine Design
Stress concentration is caused due to

Abrupt change of section
Variation in properties of material from point to point in a member
All of these
Pitting at points or areas at which loads on a member are applied

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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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