Machine Design
The longitudinal joint in boilers is used to get the required

Diameter of boiler
Length of boiler
Efficiency of boiler
Length and diameter of boiler

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Machine Design
The angle of twist of shaft is

Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²

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