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For how long is a specimen heated in a standard core above 1000°F?(a) 8-10 minutes(b) 10-12 minutes(c) 12-14 minutes(d) 14-16 minutesThe question was asked in semester exam.My question is taken from Testing of Core Sands in section Sand Reclamation & Control Test of Casting-Forming-Welding II |
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Answer» The correct choice is (B) 10-12 minutes |
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