Chemical Engineering Basics
Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

Cobalt, zirconium & molybdenum
Cobalt, chromium & nickel
Cobalt, chromium & tungsten
Molybdenun, tungsten & chromium

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

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

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