Machine Design
The function of the washer is to

Provide cushioning effect
Fill up the axial gap
Provide bearing area
Absorb shocks and vibrations

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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
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation

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