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  1. 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
    1. 0.20
    2. 0.25
    3. 0.30
    4. 0.35
Correct Option: D

Given ,
Tension in tight side
=
T1
= 3
Tension is slack sideT2

T1
= eμ θ
T2

where, θ = angle of overlap = 180 = π radians
∴ 3 = eμ θ
ln(3) = μ θ
∴ μ =
1
ln(3) = 0.35
π



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