Machine Design
Lewis equation in gears is used to find the

Compressive stress in bending
Shear stress
Tensile stress in bending
Fatigue 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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Machine Design
The flank of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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