Machine Design
Creep in belt is due to

All of these
Uneven extensions and contractions due to varying tension
Material of the belt
Material of the pulley

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

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