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Up to what percent is the efficiency increased by using exothermic materials?

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in Casting-Forming-Welding I by (687k points)
Up to what percent is the efficiency increased by using exothermic materials?

(a) 65%

(b) 70%

(c) 755

(d) 80%

I got this question at a job interview.

My query is from Functions of a Riser in portion Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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Correct answer is (b) 70%

Best explanation: The use of exothermic materials causes to increase the efficiency by around 70%. The use of exothermic materials also causes the riser to be of only one-third its regular size.

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