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Question
In worm, gears, pitch lead angle is
Options:
A .  half the angle between two inclined faces in axial plane
B .  the angle between the tangent to the pitch helix and the plane of rotation
C .  the angle between the tangent to the pitch helix and an element of the cylinder
D .  none of the above
Answer: Option B
Answer: (b).the angle between the tangent to the pitch helix and the plane of rotation

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