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

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

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Chemical Engineering Basics
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Cutlery, screws, rivets and files
Mandrels, twist drills, small lathe tools and razors
Small punches, broaches reamers and springs
Forgings like can shaft, structural steel plate, threading dies and drawing dies

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