Machine Design
The creep in the belt is due to

Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material
Effect of temperature on belt
Material of belt

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Machine Design
In worm, gears, pitch lead angle is

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

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