Machine Design
A woodruff key is

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

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Machine Design
Crowning on pulley helps

To increase pulley life
To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
In increasing the slip of the belt

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