Machine Design
Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to

Static loading
Completely reversed loading
Dynamic loading
Combined static and dynamic loading

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Machine Design
A woodruff key is

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

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

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