Machine Design
A feather key is generally

Loose in shaft and tight in hub
Loose in both shaft and hub
Tight in shaft and loose in hub
Tight in both shaft and hub

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

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

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