Machine Design
A shaft coupling should

Transmit full power of the shaft
Hold the shafts in perfect alignment
All of these
Be easy to connect or disconnect

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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
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

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