Chemical Engineering MCQs

Page No. 787

Most of the phosphorous present in the blast furnace burden enters into___________________?


aHot metal


bFlue gases


cSlag


dRefractory lining


View Answer Hot metal

Density in the solid state is slightly less than that in its liquid state, in case of____________________?


aCarbon dioxide


bWater


cMercury


dNone of these


View Answer Water

Starting friction is low in case of the ____________________ lubrication?


aBoundary


bHydrodynamic


cHydrostatic


dMixed/semi-fluid


View Answer Hydrostatic

Large scale fire on fuel gas line is normally extinguished by________________?


aWater


bSteam


cFoam


dNitrogen


View Answer Nitrogen

Which of the following metals is not subjected to electrolytic refining/purification ?


aCopper


bZinc


cTin


dAluminium


View Answer Tin

Strain hardening effect in a metal subjected to cold working is due to the ______________ mechanism?


aFracture


bDislocation


cSlip


dTwinning


View Answer Slip

Temperature attained in soldering of metals is about ________________ °C?


a150-300


b400-500


c650-800


d1000-1100


View Answer 150-300

Which of the following are considered applications of ultrasonic testing ?


aDetermination of elastic constant


bDetection of defects in metal


cMeasurement of material thickness


dNone of the above



Most important property of steels for use in automobile bodies is the___________________?


aFormability


bYield strength


cToughness


dResilience


View Answer Formability

Preheating before welding is done to____________________?


aMake the plate softer


bBurn oil & grease sticking to plate surfaces


cAvoid plate distortion


dPrevent cold cracks


View Answer Prevent cold cracks

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