at the hearth bottom of the furnace on which stock is placed.
used for furnace insulation.
used in the roof of the furnace.
none of these.
✅ The correct answer is option A.
Refractory Technology MCQs
Mullite is chemically represented by
Al2O3 . 2SiO2
3Al2O3 . 2SiO2
Al2O3 . SiO2
2Al2O3 . 3SiO2
✅ The correct answer is option B.
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
10
100
500
1000
✅ The correct answer is option D.
High alumina refractories are used in the
dome of blast furnace stoves.
electric arc furnace roof.
glass melting furnaces.
all (a), (b) and (c).
✅ The correct answer is option D.
Permeability of bricks is a measure of the
refractoriness.
melting point.
rate at which a fluid will pass through the pores.
expansion during heating.
✅ The correct answer is option C.
Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
cost
electrical conductivity
thermal conductivity
fusion point
✅ The correct answer is option A.
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
preheating
cooling
burning
all
✅ The correct answer is option C.
Which is the most stable crystalline form of silica at room temperature ?
Quartz
Cristobalite
Tridymite
None of these
✅ The correct answer is option A.
‘Spinel’, a refractory mineral is chemically represented as
MgAl2O4
MgAl2O3
MgSO4
MgAl2O3.2H2O
✅ The correct answer is option A.
The largest consumer of refractories is the __________ industry.
cement
metallurgical
fertiliser
power
✅ The correct answer is option B.