Machine Design
For circumferential joint in boilers, the type of joint used is

Lap joint with one ring overlapping the other
Butt joint with double cover plate
Butt joint with single cover plate
Any one of the above

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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 curvature of the cylinder wall is neglected
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

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