Chemical Engineering MCQs

Page No. 839

Temper brittleness of a material can be fairly detected by the ________________ test ?


aFatigue


bNotched bar impact


cTensile


dHardness


View Answer Notched bar impact

There are one octahedral void and ______________ tetrahedral void in the closest packing of atoms ?


aOne


bTwo


cThree


dNone of these


View Answer Two

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water) ?


aAluminium


bCopper


cTitanium


dStainless steel


View Answer Titanium

Addition of small amount of ________________ to grey cast iron is done to produce nodular grey cast iron ?


aManganese


bPhosphorous


cMagnesium


dChromium


View Answer Magnesium

In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (ζ) and thermal diffusivity (α). The units of these quantities are ?


aμ , α and θ all have units of m/s


bμ , α and θ all have units of m2/s


cα and θ have units of m2/s, while μ has unit of m/s


dα and θ have units of m/s, while μ has unit of m2/s



Fire in fuel gas pipelines is extinguished most effectively by _________________?


aSpraying water


bBlanketting the area with nitrogen atmosphere


cFire fighting foam


dNone of these



Fibrous fracture is normally encountered in the ____________________ materials?


aHard


bElastic


cDuctile


dBrittle


View Answer Ductile

A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will____________________?


aIncrease


bDecrease


cRemain unaffected


dMay increase or decrease; depends on the thickness of each layer


View Answer Remain unaffected

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as__________________?


aRigid


bTough


cDuctile


dPlastic


View Answer Ductile

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is____________________?


aMore


bEqual


cLess


dDouble


View Answer More

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