Machine Design
Basic hole is one

Whose lower as well as upper deviations are zero
Whose upper deviation is zero
Whose lower deviation is zero
Does not exist

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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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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards right of the bearing making the metal to metal contact

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