Machine Design
In the assembly of pulley, key and shaft

Pulley is made the weakest
Key is made the weakest
Key is made the strongest
All the three are designed for equal strength

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Machine Design
A woodruff key is

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

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Machine Design
Stress concentration is caused due to

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

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