Chemical Engineering MCQs

Page No. 265

High thermal conductivity of a refractory material is not important, when it is to be used in the______________________?


aCoke oven regenerators


bMuffle furnace


cBlast furnace


dRecuperators


View Answer Blast furnace

Magnesite bricks are used in those parts of furnaces, which are __________________?


aSubjected to temperature fluctuation


bRequired to resist corrosive basic slag


cSubjected to high load


dNone of these



Fireclay bricks are never used in the______________?


aBeehive oven


bCoke oven walls


cZinc roaster


dLead blast furnace


View Answer Coke oven walls

Resistance to slag attack of a refractory _____________________?


aDepends on the nature of slag & refractory


bDecreases at higher temperature


cDecreases, if defective joints & cracks exist in the refractory


dAll A., B. and C.


View Answer All A., B. and C.

Which is not an alumino-silicate refractory ?


aFireclay bricks


bMullite bricks


cTar dolomite bricks


dHigh alumina bricks


View Answer Tar dolomite bricks

An indication of degree of firing in silica brick is its____________________?


aSpecific gravity


bFusion point


cRUL


dNone of these


View Answer Specific gravity

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?


aTar bonded dolomite bricks


bFireclay bricks


cMullite bricks


dMagnesite bricks



Refractories are dried in the _______________?


aRotary kilns


bTunnel kilns


cSun


dNone of these


View Answer Tunnel kilns

Electrical resistor bars are made of _______________?


aSilicon carbide


bAlumina


cZirconia


dGraphite


View Answer Silicon carbide

Firing temperature is minimum (1250-1400 °C) for _______________ bricks?


aFireclay


bDirect bonded basic


cSilica


dMagnesite


View Answer Fireclay

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