Chemical Engineering MCQs

Page No. 264

Panel test determines the _____________ of refractories?


aFusion point


bSpalling resistance


cSlag penetration resistance


dRefractoriness under load (RUL)


View Answer Spalling resistance

Maximum alumina content in high alumina refractory can be as high as _____________ percent?


a30


b50


c70


d90


View Answer 90

Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?


a5


b20


c40


d55


View Answer 20

Quartz is___________________?


aStable form of silica upto 870°C


bConverted to Tridymite on firing between 870 to 1470°C


cTransformed to Cristobalite on heating above 1470°C


dAll A., B. and C.


View Answer All A., B. and C.

Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except ?


aCost


bElectrical conductivity


cThermal conductivity


dFusion point


View Answer Cost

Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?


a1520-1630


b1630-1670


c> 1730


d> 2000


View Answer > 1730

Hollow refractory bricks are made by___________________?


aSlip casting


bHand moulding


cpressing/machine moulding


dExtrusion


View Answer Slip casting

A steel member used in the furnace construction to take the thrust of the brickwork is called___________________?


aBuckstay


bBreast wall


cArmouring


dBaffle


View Answer Buckstay

Basic bricks are not made of ___________________?


aFireclay


bMagnesite


cForsterite


dChromite


View Answer Fireclay

Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?


a1520


b1630


c1670


d1730


View Answer 1730

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