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

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cTransformed to Cristobalite on heating above 1470°C

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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

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dExtrusion

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View Answer Slip casting

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


aBuckstay

✓


bBreast wall

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cArmouring

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dBaffle

✖


View Answer Buckstay

Basic bricks are not made of ___________________?


aFireclay

✓


bMagnesite

✖


cForsterite

✖


dChromite

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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

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b1630

✖


c1670

✖


d1730

✓


View Answer 1730

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