Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at the centroidal axis and maximum at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member

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Machine Design
Which is correct statement?

A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid
A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
Which one is rigid will depend on several other factors

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

Move towards right of the bearing making metal to metal contact
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

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