Chemical Engineering Basics
Function of feed check valve in a boiler is to

Facilitate circulation of high pressure feed water
Prevent the back flow of water
Regulate the water flow to boiler
Check the water level in the boiler drum

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

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

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