In a band and block brake, the ratio of tensions on tight side and slack side of the band is (where = Coefficient of friction between the blocks and the drum, = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)

• A. <img src="/_files/images/mechanical-engineering/theory-of-machines/506-352-1.png">
• B. <img src="/_files/images/mechanical-engineering/theory-of-machines/506-352-2.png">
• C. <img src="/_files/images/mechanical-engineering/theory-of-machines/506-352-3.png">
• D. <img src="/_files/images/mechanical-engineering/theory-of-machines/506-352-4.png">