Machine Design
Which of the following key is preferred for the condition when a large amount of impact type torque is to be transmitted in both direction of rotation?

Gib-head key
Feather key
Tangent key
Woodruff key

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Machine Design
In composite or reverse laid ropes

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

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