Machine Design
When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Internal bevel gears
Miter gears
Angular bevel gears
Crown bevel gears

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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
None of these
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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