Machine Design
Lewis equation in gears is used to find the

Tensile stress in bending
Fatigue stress
Compressive stress in bending
Shear stress

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Machine Design
The angle of twist of shaft is

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

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