Al2O3 . 2SiO2
3Al2O3 . 2SiO2
Al2O3 . SiO2
2Al2O3 . 3SiO2
✅ The correct answer is option B.
Engineering
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3132. 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.
3133. Colour of fireclay bricks is
light buff to reddish buff
yellow
black
none of these
✅ The correct answer is option A.
3134. 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.
3135. Hot metal runner in blast furnace are lined with __________ bricks.
silica
carborundum
fireclay
magnesite
✅ The correct answer is option C.
3136. High alumina refractories are used in the
dome of blast furnace stoves.
electric arc furnace roof.
glass melting furnaces.
all (a), (b) and (c).
✅ The correct answer is option D.
3137. 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.
3138. Panel test determines the __________ of refractories.
fusion point
spalling resistance
slag penetration resistance
refractoriness under load (RUL)
✅ The correct answer is option B.
3139. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
10
100
500
1000
✅ The correct answer is option D.
3140. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
<120
>120
<90
90-110
✅ The correct answer is option B.