Chemical Engineering MCQs

Page No. 272

Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?


a2-3

✖


b5-7

✖


c7-12

✖


d14-20

✓


View Answer 14-20

______________ bricks are used in the burning zone of a cement rotary kiln ?


aHigh alumina

✓


bFireclay

✖


cThoria

✖


dSilicon carbide

✖


View Answer High alumina

Chrome magnesite is not used in the ____________________?


aInner lining of L.D. converter

✖


bAluminium melting furnaces

✖


cWear out lining of steel melting furnaces

✓


dAll A., and B. and C.

✖



The linear thermal expansion of _______________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent?


aFireclay

✓


bSilica

✖


cMagnesite

✖


dCorundum

✖


View Answer Fireclay

Spalling of a refractory means its____________________?


aSoftening

✖


bFracture due to uneven expansion at high temperature

✓


cResistance to compressive loads

✖


dResistance to chemical action of gases and molten fluxes

✖



Bauxite calcining rotary kilns are lined with ________________ bricks?


aFireclay

✖


bCarbon

✖


c85% alumina

✓


dCorundum

✖


View Answer 85% alumina

Lower part of hot metal mixer are lined with _____________ bricks?


aSuperduty fireclay

✖


bHigh alumina

✖


cSilica

✖


dCarborundum

✓


View Answer Carborundum

Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?


aSoaking pits

✖


bReheating furnace

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cL.D. converter

✓


dRotary lime kiln

✖


View Answer L.D. converter

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?


a10

✖


b15

✖


c20

✖


d30

✓


View Answer 30

Chrome magnesite bricks are_________________?


a Acidic in nature

✖


bNeutral in nature

✖


cHaving higher RUL than silica bricks

✓


dMade by mixing 30% Chromite and 70% Periclase

✖



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