increases
decreases
remains same
may increase or decrease
✅ The correct answer is option A.
Chemical Engineering 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.
Which of the following is not a high alumina refractory material ?
Kyanite
Sillimanite
Diaspore
Periclase
✅ The correct answer is option D.
Spalling of a refractory means its
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.
Refractories used in/for __________ should have low thermal conductivity.
coke ovens
insulation
regenerators
muffle furnaces
✅ The correct answer is option B.
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.
Mullite is chemically represented by
Al2O3 . 2SiO2
3Al2O3 . 2SiO2
Al2O3 . SiO2
2Al2O3 . 3SiO2
✅ The correct answer is option B.
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.
Colour of fireclay bricks is
light buff to reddish buff
yellow
black
none of these
✅ The correct answer is option A.
Refractoriness under load (RUL) is the most important property for the refractory bricks
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.