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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 |
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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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