M

Mr. Dubey • 100.64K Points
Coach

Q. What is the amount of sea coal needed in cast irons for large green casting moulding sands?

  • (A) 10%
  • (B) 15%
  • (C) 20%
  • (D) 25%
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Explanation by: Mr. Dubey
sea coal otherwise is used in small numbers for binding. sea coal is used for surface appearance improvement. it is used about 10% in cast iron moulding sands for large green casting sands.

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