Tar dolomite
Carbon
Silica
Fireclay
✅ The correct answer is option B.
Refractory Technology MCQs
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
2-Mar
5-Jul
7-Dec
14-20
✅ The correct answer is option D.
Bottom of basic open hearth furnace are constructed of
dead burnt magnesite ramming mass.
porous fireclay bricks.
semi-silica bricks.
silicon carbide bricks.
✅ The correct answer is option A.
Grog
contains both alumina and silica.
iscrushed firebrick.
is a non-plastic material.
all (a), (b) and (c).
✅ The correct answer is option D.
Which one expands on heating ?
Silica bricks
Fireclay bricks
Both (a) & (b)
Neither (a) nor (b)
✅ The correct answer is option A.
__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
High thermal conductivity
Low porosity
Non-wetting characteristics
High density
✅ The correct answer is option C.
Silicon carbide refractories are used in the
muffle furnace
zinc smelting furnace
ceramic recuperators
all (a), (b) and (c)
✅ The correct answer is option D.
RUL of refractories depends on the
chemical composition.
physical structure.
presence of impurities like iron & alkali.
all (a), (b) and (c).
✅ The correct answer is option D.
Quartz is
stable form of silica upto 870°C.
converted to tridymite on firing between 870 to 1470°C.
transformed to crystoballite on heating above 1470°C.
all (a), (b) and (c).
✅ The correct answer is option D.
Vacuum steel degassing units are lined with
silica bricks
low duty firebricks
high alumina bricks
graphite blocks
✅ The correct answer is option C.