Magnesite
Dolomite
Fireclay
Chrome magnesite
✅ The correct answer is option C.
Engineering
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3032. Chrome magnesite brick is not used for lining the
hearth of soaking pits.
bottom hearth of reheating furnace.
coke oven regenerator.
burning zone of limestone rotary kilns.
✅ The correct answer is option C.
3033. 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.
3034. Which of the following does not occur during firing/burning of refractories ?
Removal of water of hydration.
Vitrification.
Decrease in crushing strength.
Development of stable mineral form.
✅ The correct answer is option C.
3035. Periclase refractory contains mainly
CaO
MgO
Al2O3
SiO2
✅ The correct answer is option B.
3036. Refractory bricks having lower porosity have
high insulating properties
low heat capacity
low thermal conductivity
greater strength
✅ The correct answer is option D.
3037. Thoria
has high fusion temperature (> 3000°C) but poor resistance to thermal shock.
has high resistance to basic slags.
which is expensive & radioactive, is used in crucibles for melting high purity metals.
all (a), (b) and (c).
✅ The correct answer is option D.
3038. Which is not a natural insulating material?
Diatomaceous earth/kieselgur
Asbestos
Vermiculite
None of these
✅ The correct answer is option D.
3039. 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.
3040. Magnesite refractories are generally not used in the
electric furnace walls.
steel melting furnace.
open hearth furnace.
burning zone of cement kilns.
✅ The correct answer is option B.