In extrusion of metals, which of the following statements 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.
Correct answer is D
No explanation has been provided for this answer.
