Machine Design
A fast and loose pulley drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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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 least radius of gyration of the column
Effective length of column to width of column

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