Chemical Engineering MCQs

Page No. 262

Carbon refractory blocks ___________________?


aAre wetted by molten iron

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bAre used in the hearth of blast furnace

✓


cAre acidic in nature

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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

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bCarborundum

✓


cBauxite

✖


dPericlase

✖


View Answer Carborundum

Alumina-graphite bricks are used for lining the ____________________?


aSlide gate in teeming laddies

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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

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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

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View Answer 1

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


aGreen strength

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bVoids

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cShrinkage

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dBoth B. and C.

✓


View Answer Both B. and C.

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