high insulating properties
low heat capacity
low thermal conductivity
greater strength
✅ The correct answer is option D.
Refractory Technology MCQs
To resist spalling tendency, a refractory should have
greater diffusivity.
low specific heat.
low thermal co-efficient of expansion.
all (a), (b) and (c).
✅ The correct answer is option D.
Spray test determines the __________ of refractories.
resistance to slag penetration
resistance to CO attack
RUL
permanent linear change
✅ The correct answer is option A.
Test piece for determination of RUL of a refractory is heated in a/an
oxidising atmosphere
reducing atmosphere
electric furnace
neutral atmosphere
✅ The correct answer is option C.
Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
high duty fireclay
silica
mullite
carborundum
✅ The correct answer is option A.
The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
fireclay
silica
magnesite
corundum
✅ The correct answer is option A.
Faster rate of drying of moulded refractories results in high __________ of refractories.
green strength
voids
shrinkage
both (b) and (c)
✅ The correct answer is option D.
High density refractory bricks have lower
spalling resistance.
thermal conductivity.
fusion point.
slag penetration resistance.
✅ The correct answer is option A.
Magnesite chrome bricks are used in the
roof lining of basic open hearth & other basic furnaces.
reheating furnaces.
soaking pits.
all (a), (b) and (c).
✅ The correct answer is option D.
Chemically, mullite refractories is
3Al2O3.2SiO2
Al2O3
ZrSO4
ThO2
✅ The correct answer is option A.