Machine Design
A woodruff key is

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

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Machine Design
Crowning on pulley helps

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

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Machine Design
Cap screws are

Slotted for a screw driver and generally used with a nut
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Provided with detachable caps

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Machine Design
In composite or reverse laid ropes

Direction of twist of wires and strands are same
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
Wires are not twisted

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