Machine Design
Slenderness ratio is the ratio of

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

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Machine Design
An open belt drive is used when

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
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is twice the centrifugal tension
The tension in tight side is thrice the centrifugal tension
The tension in slack side is equal to the centrifugal tension
None of these

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