Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Grinding and lapping surface
Cold working
Shot peening
Hot working

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Machine Design
In oilness bearings

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

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Machine Design
Set screws are

Slotted for a screw driver and generally used with a nut
Similar to stud
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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