In a roll crusher, which statements about the two rolls are generally true?
Chemical Engineering
Mechanical Operations
Difficulty: Easy
Choose an option
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ABoth rolls have the same diameter.
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BThe rolls rotate towards each other (counter-rotating at the nip).
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CThe rolls may run at the same or at different speeds.
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DAll of the above
Answer
Correct Answer: All of the above
Explanation
Introduction / Context:Roll crushers consist of two cylindrical rolls set close together, drawing particles into the gap for compression and shearing.
Concept / Approach:Standard practice uses equal-diameter rolls, rotating towards each other at the nip to draw in material. Speed can be equal or deliberately differential to increase shear and improve nip efficiency for certain materials.
Final Answer:All of the above