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If a driven pulley is made to rotate at 350 rpm by a driving pulley of 0.3 m diameter, running at 1400 rpm, what will be the length of open belt drive when the pulleys are 2 m apart?

a) 7.14 m
b) 6.45 m
c) 8.88 m
d) 10 m

Answer: b
Explanation: N1D1 = N2D2
1400 * 0.3 = 350 * D2
D2 = 1.2 m
Length of open belt drive = 2C + \(\frac{[π(D1+D2)]}{2}+\frac{(D1-D2)^2}{4C} \)
= 2*2 + \(\frac{[π(1.5)]}{2}+\frac{(0.9)^2}{8} \)
= 6.45 m

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