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
A bolt of uniform strength can be developed by

None of these
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter smaller than the diameter of the unthreaded portion

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