Machine Design
In static loading, stress concentration is more serious in

Ductile materials
Brittle materials
Brittle as well as ductile materials
Elastic materials

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

Crossed belt drive transmits more power than open belt drive
Open belt drive transmits more power than crossed 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
In hydrodynamic bearings

The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
Do not require external supply of lubricant

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