Chemical Engineering MCQs

Page No. 267

Mixing of ground refractory material and water is done in a ______________ mill?


aPug


bBall


cTube


dRod


View Answer Pug

With increase in the density of silica refractories, its_______________?


aResistance to slag attack increases


bSpalling resistance reduces


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

‘Spinel’, a refractory mineral is chemically represented as____________________?


aMgAl2O4


bMgAl2O3


cMgSO4


dMgAl2O3.2H2O


View Answer MgAl2O4

SiO2 percentage in firebrick is about____________________?


a35-40


b55-60


c80-85


d> 94


View Answer 55-60

Which of the following impurities reduces the refractoriness of magnesite bricks ?


aAl2O3


bCaO


cSiO2


dAll A., B. & C.


View Answer All A., B. & C.

Semi-silica bricks compared to silica bricks have_______________?


aLess fusion point


bBetter spalling resistance


cBoth A. and B.


dNeither A. not B.


View Answer Both A. and B.

Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?


aPreheating


bCooling


cBurning


dAll the above


View Answer Burning

____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?


aHigh thermal conductivity


bLow porosity


cNon-wetting characteristics


dHigh density



Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?


a80 and 20


b20 and 80


c50 and 50


d60 and 40


View Answer 80 and 20

Chrome magnesite brick is not used for lining the___________________?


aHearth of soaking pits


bBottom hearth of reheating furnace


cCoke oven regenerator


dBurning zone of limestone rotary kilns


View Answer Coke oven regenerator

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