Chemical Engineering MCQs

Page No. 266

Which of the following is not a neutral refractory ?


aSilicon carbide


bMagnesite


cChromite


dGraphite


View Answer Magnesite

Which is the stable form of silica below 870°C ?


aTridymite


bCristobalite


cQuartz


dNone of these


View Answer Quartz

Insulating refractories should have_______________?


aHigh porosity


bLow thermal conductivity


cBoth A. and B.


dNeither A. not B.



With increase in the alumina content in firebricks, its fusion point (refractoriness) ?


aDecreases linearly


bRemains unchanged


cIncreases


dDecreases


View Answer Increases

Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?


a1380


b1520


c1710


d1915


View Answer 1710

Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?


aFireclay


bCarborundum


cGraphite


dChromite


View Answer Graphite

Grog__________________?


aContains both alumina and silica


bIs crushed firebrick


cIs a non-plastic material


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following is not an acidic refractory?


aSilica bricks


bFireclay bricks


cBauxite bricks


dMagnesia bricks


View Answer Magnesia bricks

Firing temperature of magnesite bricks is about _____________ °C?


a800-1000


b1000-1200


c1600-1800


d2400-2600


View Answer 1600-1800

Silicon carbide refractories are used in the _____________?


aMuffle furnace


bZinc smelting furnace


cCeramic recuperators


dAll A., B. and C.


View Answer All A., B. and C.

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