softening.
fracture due to uneven expansion at high temperature.
resistancce to compressive loads.
resistance to chemical action of gases and molten fluxes.
✅ The correct answer is option B.
Refractory Technology MCQs
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
1520
1630
1670
1730
✅ The correct answer is option D.
Colour of fireclay bricks is
light buff to reddish buff
yellow
black
none of these
✅ The correct answer is option A.
Porosity is induced in insulating refractories by adding
powdered naphthalene.
ammonium chloride/sulphate.
calcium phosphate.
all (a), (b) and (c).
✅ The correct answer is option D.
Refractory bricks with lower permeability is produced by using
higher firing temperature.
higher moulding pressure.
finer grog size.
all (a), (b) and (c).
✅ The correct answer is option D.
Panel test determines the __________ of refractories.
fusion point
spalling resistance
slag penetration resistance
refractoriness under load (RUL)
✅ The correct answer is option B.
Hot metal runner in blast furnace are lined with __________ bricks.
silica
carborundum
fireclay
magnesite
✅ The correct answer is option C.
Magnesite bricks are used in those parts of furnaces, which are
subjected to temperature fluctuation.
required to resist corrosive basic slag.
subjected to high load.
none of these.
✅ The correct answer is option B.
Dolomite bricks have good resistance to attack by
molten steel
iron oxide
lime slag
none of these
✅ The correct answer is option A.
Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
aluminium phosphate
water
lime
plaster of paris
✅ The correct answer is option B.