Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

Which of the following relationships between co-efficinet of friction

1.	Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
A.	μ > tan α
B.	μ ≥ tan α
C.	μ > tan 2α
D.	μ ≤ tan α
Answer» C. μ > tan 2α

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Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?

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