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


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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