Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Power transmission does not depend upon open and crossed types of constructions
Open and crossed belt drives transmit same power
Crossed belt drive transmits more power than open belt drive
Open belt drive transmits more power than crossed belt drive

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Machine Design
In worm, gears, pitch lead angle is

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

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