Which sequence of steps is correct for the manufacture of cement ?
Correct answer: C. crushing grinding mixing heating
- A. crushing heating mixing grinding
- B. crushing mixing heating grinding and mixing
- C. crushing grinding mixing heating
- D. mixing heating grinding crushing
Explanation
Cement manufacture proceeds by crushing the raw materials, grinding them, mixing the ground material to obtain a uniform composition, and heating it in the rotary kiln. This gives crushing, grinding, mixing and heating, represented by c. Students may choose b because mixing occurs before heating, but the sequence incorrectly places heating before the final grinding step described there.
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