Machine Design
A shaft coupling should

Transmit full power of the shaft
All of these
Hold the shafts in perfect alignment
Be easy to connect or disconnect

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Machine Design
In oilness bearings

The oil film is maintained by supplying oil under pressure
Do not require external supply of lubricant
Grease required to be applied after some intervals
The oil film pressure is generated only by the rotation of the journal

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Machine Design
The flank of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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