Machine Design
When the speed of belt increases,

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

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Machine Design
Stress concentration is caused due to

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

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