Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Face width
Backlash
Working depth
Clearance

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

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

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