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Backward extrusion is another name for which of the following?

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in Casting-Forming-Welding II by (119k points)
Backward extrusion is another name for which of the following?

(a) Direct extrusion

(b) Indirect extrusion

(c) Impact extrusion

(d) Hydrostatic extrusion

This question was addressed to me during an online exam.

This interesting question is from Extrusion and Wire Drawing topic in portion Forming Process of Casting-Forming-Welding II

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The correct choice is (b) Indirect extrusion

The best I can explain: Direct extrusion is also called as backward extrusion. In this method, the metal is extruded back into the plunger.

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