composite material containing both ceramic & metallic constituents.
having high strength & resistance to high temperature.
used in space vehicles, missiles & nuclear energy plants.
all (a), (b) and (c).
✅ The correct answer is option D.
Refractory Technology MCQs
Fusion temperature of pure silica (SiO2) is __________ °C.
1350
1715
2570
2800
✅ The correct answer is option B.
Which is not an alumino-silicate refractory?
Fireclay bricks.
Mullite bricks.
Tar dolomite bricks.
High alumina bricks.
✅ The correct answer is option C.
Conversion of silica mineral to cristobalite is accompanied by reduction in its
volume
specific gravity
both (a) & (b)
neither (a) nor (b)
✅ The correct answer is option B.
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
fireclay
silica
dolomite
very low alumina
✅ The correct answer is option B.
Zirconia refractories are not used in
making sheaths for thermocouple.
lining high temperature ceramic kilns.
furnaces subjected to fluctuating temperature.
high frequency induction furnaces in the form of inductors.
✅ The correct answer is option C.
Refractory castables are used for
producing monolithic linings.
patch work.
minimising the number of joints in the structure.
all (a), (b) and (c).
✅ The correct answer is option D.
Hot face insulating linings of high purity alumina fused mullite are used, where
very high temperatures are involved.
highly reducing conditions are involved.
presence of iron or silica is harmful.
all (a), (b) and (c).
✅ The correct answer is option D.
Which one contains minimum percentage of SiO2?
Firebrick
Sillimanite
Semi-silica
Aluminous firebrick
✅ The correct answer is option B.
Chrome magnesite is not used in the
inner lining of L.D. converter.
aluminium melting furnaces.
wear out lining of steel melting furnaces.
all (a), and (b) and (c)
✅ The correct answer is option C.