Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to (Where, Pc = tension in belt due to centrifugal force)

3 Pc
Pc/3
2 Pc
1 Pc

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Machine Design
Stress concentration is caused due to

All of these
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
Abrupt change of section

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