In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to
A. Increase the key length
B. Increase the key depth
C. Increase the key width
D. Decrease the key length
Answer: Option A
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Due to twice increase in diameter of pulley, torque on key is double and has to be resisted by key width. Length can't be increased as belt width is same. So correct option is c
Ans is increase the width.
Option c is correct