Which of the following relationships between co-efficient of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
Correct answer: B. μ ≥ tan α
- A. μ > tan α
- B. μ ≥ tan α
- C. μ > tan 2α
- D. μ ≤ tan α
Explanation
For particles to be nipped and drawn into the rolls, the friction coefficient must satisfy μ ≥ tan α, where α is half the angle of nip. Equality represents the limiting condition for successful gripping.
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