Discussion
When considering the extrusion process, why might a metalworker opt for "indirect extrusion" over "direct extrusion"?
Answer: B
A metalworker may prefer indirect extrusion because the billet remains stationary in it. In direct extrusion the billet slides in the container, and the friction along the container wall requires a larger force. In indirect extrusion the die moves toward the billet, so there is no relative motion with the container and the force is lower. The statement that indirect extrusion needs more force is the reverse of the truth, and the remaining options are not the reasons that favour the indirect process.
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