Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

Both the ends fixed
One end fixed and the other end hinged
One end fixed and the other end free
Both the ends hinged

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Machine Design
Spring index is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Indication of quality of spring
Load required to produce unit deflection

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Machine Design
In hydrostatic bearings

Grease is used for lubrication
The oil film is maintained by supplying oil under pressure
The Oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant

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