Machine Design
The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are εc and εl respectively. The change in volume of the boiler cylinder per unit volume will be

2εc + εl
εc + 2εl
εc + εl²
εc² + εl

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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
Crossed belt drive transmits more power than open belt drive
Open and crossed belt drives transmit same power
Open belt drive transmits more power than crossed belt drive

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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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