Chemical Engineering MCQs

Page No. 262

Carbon refractory blocks ___________________?


aAre wetted by molten iron


bAre used in the hearth of blast furnace


cAre acidic in nature


dAll A., B. and C.



Fireclay bricks are used in the___________________?


aFurnaces allowed to cool frequently


bFlues


cChimney linings


dAll A., B. and C.


View Answer All A., B. and C.

High density refractory bricks have lower__________________?


aSpalling resistance


bThermal conductivity


cFusion point


dSlag penetration resistance


View Answer Spalling resistance

Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?


aWashing action of metal


bCorrosion by layer of slag


cBoth A. & B.


dNeither A. nor B.



The main raw material for manufacture of silicon carbide refractories is_________________?


aCorundum


bCarborundum


cBauxite


dPericlase


View Answer Carborundum

Alumina-graphite bricks are used for lining the ____________________?


aSlide gate in teeming laddies


bContinuous casting systems


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Porosity of silica bricks varies from ______________ percent?


a5 to 10


b20 to 30


c45 to 60


d60 to 75


View Answer 20 to 30

Silica refractories are not used in _________________?


aCoke oven walls


bBeehive coke ovens


cDome and upper portion of B.F. stoves


dOpen hearth furnace roof


View Answer Beehive coke ovens

What is the value of ‘q’ for saturated liquid feed to a distillation column ?


a0


b<1


c1


d>1


View Answer 1

Faster rate of drying of moulded refractories results in high _____________ of refractories?


aGreen strength


bVoids


cShrinkage


dBoth B. and C.


View Answer Both B. and C.

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