Machine Design
When the speed of belt increases,

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
The power transmitted will increase

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Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

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