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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%I got this question in unit test.Query is from Bonding Theory in portion Molding and Core Sands of Casting-Forming-Welding I

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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