Machine Design
A key way lowers

The strength of the shaft
Both the strength and rigidity of the shaft
The rigidity of the shaft
The ductility of the shaft

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Machine Design
In worm, gears, pitch lead angle is

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

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