Beryllia
Carborundum
Corundum
Thoria
✅ The correct answer is option A.
Chemical Engineering MCQs
Which of the following bricks has the most close values of RUL and PCE ?
Silica bricks
Fireclay bricks
High alumina bricks
Tar dolomite bricks
✅ The correct answer is option A.
Fireclay bricks is not used for lining the
cupola.
gas producer.
bottom of hot metal mixer.
roof of open hearth furnace.
✅ The correct answer is option C.
Which is the stable form of silica upto 1470°C ?
Quartz
Cristobalite
Tridymite
None of these
✅ The correct answer is option C.
An ideal refractory should have high
spalling rate
fusion point
shrinkage ability
none of these
✅ The correct answer is option B.
Which is a basic refractory ?
Fireclay
Silica
Chrome magnesite
None of these
✅ The correct answer is option C.
Refractories are dried in the
rotary kilns
tunnel kilns
sun
none of these
✅ The correct answer is option B.
Which of the following is not a neutral refractory ?
Silicon carbide
Magnesite
Chromite
Graphite
✅ The correct answer is option B.
Carbon refractories
do not burn/oxidise, when exposed to air on heating.
are not attacked by slags, as they are not wetted by melts.
do not resist temperature fluctuations.
have extremely low thermal & electrical conductivities.
✅ The correct answer is option B.
The highest melting pure oxide (m.p. > 3000°C)is
thoria
alumina
beryllia
zirconia
✅ The correct answer is option A.