spalling resistance.
fusion point.
resistance to slag penetration.
resistance to carbon monoxide attack.
✅ The correct answer is option B.
Refractory Technology MCQs
Which property of refractories is the most important for top section of the blast furnace?
Resistance to abrasion.
Resistance to slag peneration.
Stability of volume at high temperature.
Resistance to corrosion by slag.
✅ The correct answer is option A.
Basic bricks are not made of
fireclay
magnesite
foresterite
chromite
✅ The correct answer is option A.
Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
oxidising
neutral
either (a) or (b)
neither (a) nor (b)
✅ The correct answer is option C.
Fusion point of an acidic refractory material is
increased by the addition of basic oxides.
reduced by the addition of basic oxides.
not affected by the addition of basic oxides.
always more than 2500°C.
✅ The correct answer is option B.
Which is not an acidic refractory ?
Silica
Fireclay
High alumina refractory
Carbon black
✅ The correct answer is option D.
__________ is not a single oxiderefractory.
Zirconia
Silicon carbide
Magnesia
None of these
✅ The correct answer is option B.
Magnesite refractories are used for the construction of those furnaces, which are
not required to resist the corrosive action of basic slag.
not subjected to fluctuation in temperature.
used for raising & maintaining high temperature.
both (b) and (c)
✅ The correct answer is option D.
With increasing alumina content, the fusion point of high alumina refractories
increases.
decreases.
remains constant.
may increase or decrease ; depends on its alumina content.
✅ The correct answer is option A.
Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of __________ °C.
1380
1520
1710
1915
✅ The correct answer is option C.