Machine Design
The shock absorbing capacity of a bolt can be increased by

Tightening it properly
Grinding the shank
Increasing shank diameter
Making shank diameter equal to core diameter of thread

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Machine Design
In worm, gears, pitch lead angle is

None of these
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
Half the angle between two inclined faces in axial plane

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