Machine Design
The shear plane in case of bolts should

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of the restraining action of the heads at the end of the pressure vessel is neglected
All of these
The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls

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