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Question

In a band and block brake, the ratio of tensions on the tight and slack
sides of band is given by (where `mu` = Coefficient of friction between the
blocks and the drum, `theta`= Semi-angle of each block subtending at the
centre of drum, and n = Number of blocks)
Options:
A .  `T_1/T_2 = mu theta xx n`
B .  `T_1/T_2 =( mu theta )^n`
C .  `T_1/T_2 =( (1 - mu tan theta)/(1 + mu tan theta))^n`
D .  `T_1/T_2 =( (1 + mu tan theta)/(1 - mu tan theta))^n`
Answer: Option D



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