Chemical Engineering Basics
Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

Gr, Gr0.25
Gr0.25, Gr
Gr0.25, Gr0.33
Gr0.33, Gr0.25

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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
Speed of the extruded material is same as that of ram speed
Hollow ram is used for indirect extrusion
Redundant work is a function of the die angle

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