Chemical Engineering MCQs

Page No. 787

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


aHot metal

✓


bFlue gases

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cSlag

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dRefractory lining

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View Answer Hot metal

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


aCarbon dioxide

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bWater

✓


cMercury

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dNone of these

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View Answer Water

Starting friction is low in case of the ____________________ lubrication?


aBoundary

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bHydrodynamic

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cHydrostatic

✓


dMixed/semi-fluid

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View Answer Hydrostatic

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


aWater

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bSteam

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cFoam

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dNitrogen

✓


View Answer Nitrogen

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


aCopper

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bZinc

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cTin

✓


dAluminium

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View Answer Tin

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


aFracture

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bDislocation

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cSlip

✓


dTwinning

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View Answer Slip

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


a150-300

✓


b400-500

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c650-800

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d1000-1100

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View Answer 150-300

Which of the following are considered applications of ultrasonic testing ?


aDetermination of elastic constant

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bDetection of defects in metal

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cMeasurement of material thickness

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dNone of the above

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


aFormability

✓


bYield strength

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cToughness

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dResilience

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View Answer Formability

Preheating before welding is done to____________________?


aMake the plate softer

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bBurn oil & grease sticking to plate surfaces

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cAvoid plate distortion

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dPrevent cold cracks

✓


View Answer Prevent cold cracks

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