For the conveyor belt drive shown, the tension on the tight side (T1 ) is double that of the slack side

Q. For the conveyor belt drive shown, the tension on the tight side (T₁ ) is double that of the slack side. The coefficient of friction between belt and drum is 0.21. The minimum angle of lap (in degree) to avoid slippage of the belt is     

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Ans: 185.0-195.0