Chemical Engineering MCQs

Page No. 257

Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?


aSegar cones


bMuffles for muffle furnaces


cInsulating bricks


dCrucibles used for melting of high purity metals



Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?


a450


b250


c150


d65


View Answer 65

Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?


aHigh duty fireclay


bSilica


cMullite


dCarborundum


View Answer High duty fireclay

With increasing alumina content, the fusion point of high alumina refractories__________________?


aIncreases


bDecreases


cRemain constant


dMay increase or decrease; depends on its alumina content


View Answer Increases

Vacuum steel degassing units are lined with__________________?


aSilica bricks


bLow duty firebricks


cHigh alumina bricks


dGraphite blocks


View Answer High alumina bricks

Chromite refractories are_____________________?


aAcidic refractory


bNeutral refractory


cBasic refractory


dFired at a temperature of 600°C only


View Answer Neutral refractory

Thoria__________________?


aHas high fusion temperature (> 3000°C) but poor resistance to thermal shock


bHas high resistance to basic slags


cWhich is expensive & radioactive, is used in crucibles for melting high purity metals


dAll A., B. and C.


View Answer All A., B. and C.

Cold crushing strength of a refractory does not depend upon its ____________________?


aShape


bComposition


cFiring temperature


dTexture


View Answer Shape

Which is the stable form of silica between 1470°C and the melting point 1713°C ?


aCristobalite


bTridymite


cQuartz


dNone of these


View Answer Cristobalite

Maximum safe working temperature for fireclay bricks is about __________ °C?


a1150


b1300


c1300


d1550


View Answer 1550

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