Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
Abrupt change of section
All of these

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Machine Design
A woodruff key is

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

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