Machine Design
The shear plane in case of bolts should

Be across threaded portion of shank
Be parallel to axis of bolt
Never be across the threaded portion
Be normal to threaded portion of shank

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Machine Design
The fatigue stress concentration factor is defined as

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

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