Identify the incorrect statement regarding roll crushers.

Mechanical Operations MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Mechanical Operationschemical-engineering › mechanical-operations
Published
7 Mar 2019
Last updated
28 May 2026

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Choose the correct answer

Explanation

Option A is true because the maximum feed size dictates the necessary roll diameter. Option B is correct since the reduction ratio for hard materials should not exceed 4. Option C is false; the rolls do not have to run at the same speed. Option D is accurate as both reduction ratio and differential roll speed impact production rate and energy consumption per unit of surface produced.

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