Machine Design
A woodruff key is

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

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Machine Design
When the belt is transmitting maximum power,

None of these
The tension in slack side is equal to the centrifugal tension
The tension in tight side is thrice the centrifugal tension
The tension in tight side is twice the centrifugal tension

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