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

εc + εl²
εc + 2εl
2εc + εl
εc² + εl

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal

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