Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Feather key
Gib head key
Flat saddle key
Woodruff key

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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

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

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