In extrusion of metals, which of the following statement is true ?

[A].	speed of the extruded material is same as that of ram speed.
[B].	Redundant work is a function of the die angle.
[C].	Relative motion between the billet surface and the container wall is always present.
[D].	Hollow ram is used for indirect extrusion.

Answer: Option D

Explanation:

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