Half the angle of nip, ( ), for a roll crusher is given by (where, dr, dp and df are diameters of crushing rolls, feed particles and rolls gap respectively).

• A. <img src="/_files/images/chemical-engineering/mechanical-operations/105-119-1.png">
• B. <img src="/_files/images/chemical-engineering/mechanical-operations/105-119-2.png">
• C. <img src="/_files/images/chemical-engineering/mechanical-operations/105-119-3.png">
• D. <img src="/_files/images/chemical-engineering/mechanical-operations/105-119-4.png">