Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder

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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
All of these
A tapered key with head at one end

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