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 + εl²
εc + 2εl
εc² + εl

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Machine Design
When a belt drive is transmitting maximum power,

Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Effective tension is half of centrifugal tension

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