Machine Design
The dynamic tooth load is due to

All of these
Deflections of teeth under load
Irregularities in tooth profiles
Inaccuracies of tooth spacing

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Machine Design
The angle of twist of shaft is

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

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