📊 Building Materials
Q. Gypsum is added in the manufacture of Portland cement ?
  • (A) while mixing the raw materials
  • (B) during burning in the rotary kiln
  • (C) at the beginning of grinding the clinker
  • (D) at the end of grinding the clinker into powder
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✅ Correct Answer: (D) at the end of grinding the clinker into powder

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