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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