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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% |
Answer» A. 10% | |
Explanation: 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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