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Which of the following parts is used as exothermic materials or insulators for the increase in efficiency of the riser?

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in Casting-Forming-Welding I by (687k points)
Which of the following parts is used as exothermic materials or insulators for the increase in efficiency of the riser?

(a) Chills

(b) Feeding aids

(c) Biscuit

(d) Filler

This question was addressed to me during a job interview.

My doubt stems from Riser Design topic in division Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

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Correct choice is (b) Feeding aids

Easy explanation: At the time of solidification, the shrinkages are produced in the castings which are eliminated by the use of a riser. The metal in riser should be in liquid form for a long period of time as to feed the casting till it solidifies. So feeding aids are used for this purpose, they can be either exothermic materials or insulators.

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