Machine Design
Two shafts will have equal strength, if

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

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

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