Machine Design
The form factor of a helical gear __________ with the increase in the helix angle.

None of these
Increases
Remains constant
Decreases

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Machine Design
The angle of twist of shaft is

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

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