Machine Design
A woodruff key is

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

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Machine Design
In cross or regular lay ropes

Wires in two adjacent strands are twisted in opposite direction
Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires are not twisted

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