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

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

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Chemical Engineering Basics
Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Initation of crack occurs on the surface of the machine part
Initiation of crack from below the surface does not occur
Plastic deformation of material does not occur
Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

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