Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key width
Decrease the key length
Increase the key length
Increase the key depth

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Machine Design
Slenderness ratio is the ratio of

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

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