less load bearing capacity.
less resistance to slag attack.
low refractoriness.
high resistance to thermal shock and creep.
✅ The correct answer is option D.
Chemical Engineering MCQs
The largest consumer of refractories is the __________ industry.
cement
metallurgical
fertiliser
power
✅ The correct answer is option B.
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.
Thermal diffusivity of a refractory brick is high, when its __________ is high.
density
specific heat
thermal conductivity
none of these
✅ The correct answer is option C.
‘Spinel’, a refractory mineral is chemically represented as
MgAl2O4
MgAl2O3
MgSO4
MgAl2O3.2H2O
✅ The correct answer is option A.
Which is the most stable crystalline form of silica at room temperature ?
Quartz
Cristobalite
Tridymite
None of these
✅ The correct answer is option A.
Crushing strength of a refractory
increases with rise in service temperature.
decreases with rise in service temperature.
is unaffected with change in service temperature.
decreases with increase in porosity.
✅ The correct answer is option B.
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
fireclay
carborundum
graphite
chromite
✅ The correct answer is option C.
With increase in the alumina content in firebricks, its fusion point (refractoriness)
decreases linearly
remains unchanged
increases
decreases
✅ The correct answer is option C.
Cold crushing strength of a refractory does not depend upon its
shape
composition
firing temperature
texture
✅ The correct answer is option A.