Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Face width
Clearance
Backlash
Working depth

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Machine Design
In oilness bearings

Grease required to be applied after some intervals
The oil film is maintained by supplying oil under pressure
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
Slenderness ratio is the ratio of

Width of column to depth of column
Maximum size of column to minimum size of column
Effective length of column to width of column
Effective length of column to least radius of gyration of the column

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