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The preferred shape of a runner in a sand casting is ___________

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in Casting-Forming-Welding I by (687k points)
The preferred shape of a runner in a sand casting is ___________

(a) Cylindrical

(b) Spherical

(c) Rectangular

(d) Trapezoidal

The question was posed to me during a job interview.

I need to ask this question from Pattern Design in chapter Pattern and Pattern Making of Casting-Forming-Welding I

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Right choice is (d) Trapezoidal

For explanation I would say: Trapezoidal runner is most preferable in sound sand casting as it provides good flow with less distortion or splattering of molten metal.

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