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In which of the following operations is a dummy block used?

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in Casting-Forming-Welding II by (119k points)
In which of the following operations is a dummy block used?

(a) Indirect extrusion

(b) Direct extrusion

(c) Impact extrusion

(d) Hydrostatic extrusion

I have been asked this question in homework.

The question is from Extrusion and Wire Drawing topic in chapter Forming Process of Casting-Forming-Welding II

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Best answer
Correct option is (b) Direct extrusion

For explanation: In direct extrusion or forward extrusion, a dummy block is used during the functioning of the extrusion process.

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