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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°, the coefficient of friction required between drum and the band is
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- 0.20
- 0.25
- 0.30
- 0.35
- 0.20
Correct Option: D
Given , | = | = 3 | ||
Tension is slack side | T2 |
= eμ θ | ||
T2 |
where, θ = angle of overlap = 180 = π radians
∴ 3 = eμ θ
ln(3) = μ θ
∴ μ = | ln(3) = 0.35 | |
π |