1.

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

Answer» 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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