Chemical Engineering Basics
In radiative heat transfer, a grey surface is the one, which has

Grey appearance to the eye
Equal brightness in all directions
Emissivity independent of wavelength
Zero reflectivity

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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% ?

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

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