Chemical Engineering MCQs

Page No. 256

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?


aBakelite impregnated or fused periclase

✓


bSilica

✖


cSemi-silica

✖


dFireclay

✖



Colour of fireclay bricks is_________________?


aLight buff to reddish buff

✓


bYellow

✖


cBlack

✖


dNone of these

✖



Crushing strength of a refractory____________________?


aIncreases with rise in service temperature

✖


bDecreases with rise in service temperature

✓


cIs unaffected with change in service temperature

✖


dDecreases with increase in porosity

✖



The largest consumer of refractories is the _______________ industry?


aCement

✖


bMetallurgical

✓


cFertiliser

✖


dPower

✖


View Answer Metallurgical

The highest melting pure oxide (m.p. > 3000°C)is___________________?


aThoria

✓


bAlumina

✖


cBeryllia

✖


dZirconia

✖


View Answer Thoria

Zirconia refractories are not used in_____________________?


aMaking sheaths for thermocouple

✖


bLining high temperature ceramic kilns

✖


cFurnaces subjected to fluctuating temperature

✓


dHigh frequency induction furnaces in the form of inductors

✖



Dolomite bricks have good resistance to attack by_____________________?


aMolten steel

✓


bIron oxide

✖


cLime slag

✖


dNone of these

✖


View Answer Molten steel

Fireclay refractories have __________________?


aLow co-efficient of thermal expansion

✓


bPoor thermal spalling resistance

✖


cTendency to expand unduly high during firing

✖


dVery high cost

✖



Spray test determines the _____________ of refractories?


aResistance to slag penetration

✓


bResistance to CO attack

✖


cRUL

✖


dPermanent linear change

✖



PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?


a1520

✖


b1630

✖


c1670

✖


d1730

✓


View Answer 1730

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