Machine Design
Two shafts will have equal strength, if

Twisting moment of both the shafts is same
Angle of twist of both the shafts is same
Material of both the shafts is same
Diameter of both the shafts is same

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Effective tension is half of centrifugal tension

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