Machine Design
Two shafts will have equal strength, if

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

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
Cold working

Has no influence on fatigue strength
Decreases the fatigue strength
Increases the fatigue strength
Alone has no influence on fatigue strength

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