In a band brake the ratio of tight side band tension to the tension on the slack

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In a band brake the ratio of tight side band tension to the tension on the slack side is 3 . If the angle of overlap of band on the drum is \(180^{\circ}\), the coefficient of friction required between drum and the band is

(a) 0.20

(b) 0.25

(c) 0.30

(d) 0.35 .

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