Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

3 times more
4 times more
Same in both cases
2 times more

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

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

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