181. Silica bricks are never used for lining the
beehive coke ovens.
by-product coke ovens.
dome of blast furnace stoves.
roof of open hearth furnace.
✅ The correct answer is option A.
Refractory Technology MCQs
182. Lower part of hot metal mixer are lined with __________ bricks.
superduty fireclay
high alumina
silica
carborundum
✅ The correct answer is option D.
183. Which is the stable form of silica below 870°C ?
Tridymite
Cristobalite
Quartz
None of these
✅ The correct answer is option C.
184. __________ bricks are used in the burning zone of a cement rotary kiln.
High alumina
Fireclay
Thoria
Silicon carbide
✅ The correct answer is option A.
185. Carbon refractories have very high
wetting characteristics
refractoriness
thermal conductivity
both (b) and (c)
✅ The correct answer is option D.
186. Bauxite calcining rotary kilns are lined with __________ bricks.
fireclay
carbon
85% alumina
corundum
✅ The correct answer is option C.
187. 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.
188. 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.
189. Highest melting (m.p = 3070°C) oxide refractory is
alumina
thoria
zirconia
magnesia
✅ The correct answer is option B.
190. Which of the following is not an acidic refractory ?
Silica bricks
Fireclay bricks
Bauxite bricks
Magnesia bricks
✅ The correct answer is option D.