Which of the following equation can be used to determine the maximum size of rock gripped in relation to roll diameter and the reduction ratio required?
A. $${\mu _k} = \left[ {\left( {1 + 1.12v} \right)} \right] \div \left( {1 + 6v} \right)\mu $$
B. $$\cos \frac{\theta }{2} = \left( {R + a} \right) \div \left( {R + r} \right)$$
C. $$C\,\operatorname{Sin} \frac{\theta }{2} = \mu \,C\,\operatorname{Cos} \frac{\theta }{2}$$
D. $$Q = BSs.\cot \left[ {a.k.60n} \right]{m^3}/hr$$
Answer: Option B
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