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

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

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Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
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 parallel and rotate in the opposite directions

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