1.

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» Right option is (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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