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In extrusion of metals, which of the following statement is true ? | |
A. | speed of the extruded material is same as that of ram speed. [Wrong Answer] |
B. | Redundant work is a function of the die angle. [Wrong Answer] |
C. | Relative motion between the billet surface and the container wall is always present. [Wrong Answer] |
D. | Hollow ram is used for indirect extrusion. [Correct Answer] |