Machine Design
The value of Lewis form factor used in design of gears is

Dependent on system of teeth
Independent of size of teeth
All of these
Dependent on number of teeth of a gear

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

Open belt drive transmits more power than crossed belt drive
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

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