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

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Machine Design
A tap bolt

Has both the ends threaded
Has pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other

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