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

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

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Chemical Engineering Basics
The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

Increasing the surface area of the electrodes
Increasing the concentration of zinc sulphate solution
Increasing the concentration of copper sulphate solution
Decreasing the surface area of the electrodes

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