side walls of soaking pits and arc furnaces.
copper melting furnaces & converters.
burner block of glass tanks.
all (a), (b) and (c)
✅ The correct answer is option D.
Refractory Technology MCQs
42. With increase in the porosity, thermal spalling resistance of fireclay brick
increases
decreases
remains same
may increase or decrease
✅ The correct answer is option A.
43. Zircon refractories have
low co-efficient of expansion.
high RUL (1600°C) and refractoriness (> 2000°C).
high spalling resistance.
all (a), (b) and (c).
✅ The correct answer is option D.
44. Which is an acidic refractory ?
Magnesite
Dolomite
Fireclay
Chrome magnesite
✅ The correct answer is option C.
45. Segar cones are used for the determination of __________ of refractories.
softening temperature
spalling resistance
electrical conductivity
resistance to slag attack
✅ The correct answer is option A.
46. With increase in the alumina content in firebricks, its fusion point (refractoriness)
decreases linearly
remains unchanged
increases
decreases
✅ The correct answer is option C.
47. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Beryllia
Carborundum
Corundum
Thoria
✅ The correct answer is option A.
48. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
fireclay
carborundum
graphite
chromite
✅ The correct answer is option C.
49. An ideal refractory should have high
spalling rate
fusion point
shrinkage ability
none of these
✅ The correct answer is option B.
50. 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.