Machine Design
The backlash for spur gears depends upon

Both module and pitch line velocity
Module
Tooth profile
Pitch line velocity

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and the polar moment of inertia

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of recess to the circular pitch

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