bakelite impregnated or fused periclase
silica
semi-silica
fireclay
✅ The correct answer is option A.
Refractory Technology MCQs
Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
hearth of the blast furnace.
nuclear reactors, missiles & space crafts.
insulation of high temperature furnaces.
roof of electric furnaces.
✅ The correct answer is option B.
Hollow refractory bricks are made by
slip casting
hand moulding
pressing/machine moulding
extrusion
✅ The correct answer is option A.
Spalling tendency of refractories is reduced by increasing its
porosity
specific gravity
thermal conductivity
strength
✅ The correct answer is option A.
Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?
Firebricks
Silica bricks
Silicon carbide bricks
Sillimanite
✅ The correct answer is option B.