M

Mr. Dubey • 52.30K 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%
Correct : Option (A)

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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