Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The coefficient of friction between the belt and pulley increases
The power transmitted will decrease
The power transmitted will increase

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Machine Design
Stress concentration is caused due to

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
Abrupt change of section

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