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Q: Brick earth should contain about_______ of silica.
  • A. 5%-7%
  • B. 50%-60%
  • C. <10%
  • D. 15%-20%
Correct Answer: Option B - Ingredients of good brick earth– Silica – 50-60% Alumina – 20-30% Lime – 10% Magnesia – 1% Ferric oxide – 7% Alkalies – 10%
B. Ingredients of good brick earth– Silica – 50-60% Alumina – 20-30% Lime – 10% Magnesia – 1% Ferric oxide – 7% Alkalies – 10%

Explanations:

Ingredients of good brick earth– Silica – 50-60% Alumina – 20-30% Lime – 10% Magnesia – 1% Ferric oxide – 7% Alkalies – 10%