Machine Design
The expression 0.175 - 0.841/T is the Lewis form factor for

None of these
20° stub system
14½° composite and full depth involute system
20° full depth involute system

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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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