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What is the amount of sea coal needed in cast irons for small casting moulding sands?(a) 1%(b) 2%(c) 3%(d) 4% |
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Answer» The correct answer is (a) 1% Easiest explanation: In bonding of substances, an extremely small quantity of sea coal is also needed. Sea coal is used for surface appearance improvement. It is used about 1% in cast iron moulding sands for small castings. |
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