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Calculate the size of cylindrical riser (height and dia equal) to feed a steel slab casting 25x25x5 cm.(a) 10cm(b) 12.5cm(c) 14cm(d) Data insufficientI got this question in an international level competition.Enquiry is from Pattern Design topic in portion Pattern and Pattern Making of Casting-Forming-Welding I

Answer»

Correct answer is (b) 12.5cm

The best I can EXPLAIN: a = 25cmb = 5cmc = 25cm

Modulus Mc =(a×b)/2(a+b) = Mc =(25×5)/2(25+5) = 125/60 = 2.0833cm

The RISER diameter D = 6 X Mc = 6×2.0833 = 12.5cm.



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