aluminium phosphate
water
lime
plaster of paris
✅ The correct answer is option B.
Engineering
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3102. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
preheating
cooling
burning
all
✅ The correct answer is option C.
3103. Dolomite bricks have good resistance to attack by
molten steel
iron oxide
lime slag
none of these
✅ The correct answer is option A.
3104. 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.
3105. High alumina refractory compared to fireclay bricks have
less load bearing capacity.
less resistance to slag attack.
low refractoriness.
high resistance to thermal shock and creep.
✅ The correct answer is option D.
3106. The largest consumer of refractories is the __________ industry.
cement
metallurgical
fertiliser
power
✅ The correct answer is option B.
3107. 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.
3108. 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.
3109. ‘Spinel’, a refractory mineral is chemically represented as
MgAl2O4
MgAl2O3
MgSO4
MgAl2O3.2H2O
✅ The correct answer is option A.
3110. Which is the most stable crystalline form of silica at room temperature ?
Quartz
Cristobalite
Tridymite
None of these
✅ The correct answer is option A.