Chemical Engineering Basics
In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

Rain of molten lead
Mixture of water and air
Blast of air
Jet of water at high pressure

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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
Initation of crack occurs on the surface of the machine part
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

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