Machine Design
In the assembly of pulley, key and shaft

All the three are designed for equal strength
Pulley is made the weakest
Key is made the strongest
Key is made the weakest

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

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
Move towards left of the bearing making metal to metal contact

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