Machine Design
The maximum shear stress theory is used for

Ductile materials
Plastic materials
Nonferrous materials
Brittle materials

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Machine Design
A woodruff key is

A tapered key with head at one end
Capable of tilting in a recess milled out in the shaft
All of these
Fitted in pairs at right angles

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Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

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