Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

F/bh
4F/bh
2F/bh
3F/2bh

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Machine Design
In worm, gears, pitch lead angle is

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

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