increasing its porosity.
using a coarser grog during its manufacture.
decreasing its thermal co-efficient of expansion.
making it denser.
✅ The correct answer is option D.
Engineering
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3052. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
fireclay
silica
magnesite
corundum
✅ The correct answer is option A.
3053. Faster rate of drying of moulded refractories results in high __________ of refractories.
green strength
voids
shrinkage
both (b) and (c)
✅ The correct answer is option D.
3054. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.
500
1000
>1350
>2000
✅ The correct answer is option C.
3055. An indication of degree of firing in silica brick is its
specific gravity
fusion point
RUL
none of these
✅ The correct answer is option A.
3056. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
chrome or magnesite
silicon carbide
silica
lowduty fireclay
✅ The correct answer is option A.
3057. High density refractory bricks have lower
spalling resistance.
thermal conductivity.
fusion point.
slag penetration resistance.
✅ The correct answer is option A.
3058. Magnesite chrome bricks are used in the
roof lining of basic open hearth & other basic furnaces.
reheating furnaces.
soaking pits.
all (a), (b) and (c).
✅ The correct answer is option D.
3059. Magnesite bricks have poor resistance to attack by __________ slag.
lime
basic
acid
none of these
✅ The correct answer is option C.
3060. Thermal conductivity of refractory bricks
increases with decrease in porosity.
decreases with decreases in porosity.
is independent of its porosity and is maximum for insulating bricks.
increases with the amount of air entrapped in pores.
✅ The correct answer is option A.