Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Knuckle joint
Cotter joint
Universal joint
Bolted joint

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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 tensile stresses are uniformly distributed over the section of the walls
The effect of curvature of the cylinder wall is neglected
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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