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

Relative motion between the billet surface and the container wall is always present
Redundant work is a function of the die angle
Speed of the extruded material is same as that of ram speed
Hollow ram is used for indirect extrusion

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Chemical Engineering Basics
Maraging steels derive their strength from the following mechanism:

Fine dispersions of intermetallics of Fe, Ni, Ti etc
A fine, highly dislocated and strong martensite
Fine dispersions of Fe₃ C nucleated on dislocations in austenite
Fine dispersions of alloy carbides in a ferrite matrix

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