fireclay
carbon
85% alumina
corundum
✅ The correct answer is option C.
Refractory Technology MCQs
Tar bonded dolomite bricks
are stored under controlled temperature & humidity to avoid hydration.
are used in outer lining of L.D. converters.
have poorer hydration resistance than pitch bonded bricks.
all (a), (b) and (c)
✅ The correct answer is option D.
Fireclay bricks are not used in the
beehive coke oven.
by-product coke oven walls.
combustion chamber of B.F. stoves.
coke oven regenerators.
✅ The correct answer is option B.
Highest melting (m.p = 3070°C) oxide refractory is
alumina
thoria
zirconia
magnesia
✅ The correct answer is option B.
Which of the following is not an acidic refractory ?
Silica bricks
Fireclay bricks
Bauxite bricks
Magnesia bricks
✅ The correct answer is option D.
Ferromagnetic ceramic material is not used in the
thermal insulation
transformers
magnetic switches
television sets
✅ The correct answer is option A.
Maximum alumina content in high alumina refractory can be as high as __________ percent.
30
50
70
90
✅ The correct answer is option D.
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
55
70
80
90
✅ The correct answer is option D.
Graphite or carbon refractories
exihibit wetting characteristics.
should be used in neutral or reducing atmosphere.
exhibit high shrinkage on thermal treatment.
are not resistant to corrosion by slag.
✅ The correct answer is option B.
Which is not a basic refractory ?
Chrome magnesite
Magnesite
Dolomite
Silicon carbide
✅ The correct answer is option D.