Machine Design
The dynamic tooth load is due to

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

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Machine Design
In worm, gears, pitch lead angle is

None of these
The angle between the tangent to the pitch helix and the plane of rotation
The angle between the tangent to the pitch helix and an element of the cylinder
Half the angle between two inclined faces in axial plane

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact
Have contact at the bottom most of the bearing
Move towards right of the bearing making the metal to metal contact

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