Machine Design
Oldham coupling is used to connect two shafts

Whose axes intersect at a small angle
Which are not in exact alignment
Which have lateral misalignment
Which are perfectly aligned

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Machine Design
In worm, gears, pitch lead angle is

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

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