Refractory Technology Quiz 4
1 / 65
Spray test determines the ______ of refractories?
2 / 65
With increase in the alumina content in firebricks, its fusion point (refractoriness) ?
3 / 65
With increasing alumina content, the fusion point of high alumina refractories___________?
4 / 65
Which of the following does not occur during firing/burning of refractories ?
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With decrease in porosity, the _______ of the refractories decreases?
6 / 65
The linear thermal expansion of ________ bricks upto 1000 ?C is very low of the order of ? 0.5 percent?
7 / 65
Zirconia refractory__________?
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Which is required in an insulating refractory ?
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To resist spalling tendency, a refractory should have_________?
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Which is not a natural insulating material ?
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Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
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Which is the most stable crystalline form of silica at room temperature ?
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With increase in the density of silica refractories, its________?
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Which is an acidic refractory ?
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The main raw material for manufacture of silicon carbide refractories is__________?
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Which is not an acidic refractory ?
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Thoria___________?
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Which one expands on heating ?
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Zircon refractories have___________?
20 / 65
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with ______ bricks?
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Which form of silica has the highest specific gravity ?
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Spalling resistance of a refractory cannot be increased by ______?
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Which of the following is not a high alumina refractory material ?
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Which of the following impurities reduces the refractoriness of magnesite bricks ?
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Which of the following bricks has the most close values of RUL and PCE ?
26 / 65
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the__________?
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Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
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Which of the following bricks should not be used, if the furnace is to be used intermittently ?
29 / 65
Water content in ground refractory material to be shaped into bricks by hand moulding is about _______ percent?
30 / 65
Sillimanite is a ______ refractory?
31 / 65
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its________?
32 / 65
The largest consumer of refractories is the ________ industry?
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The maximum linear expansion of silica bricks during firing is about _______ percent?
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Test piece for determination of RUL of a refractory is heated in a/an______?
35 / 65
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of_______?
36 / 65
Which is the stable form of silica between 1470?C and the melting point 1713?C ?
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Tar bonded dolomite bricks___________?
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Vacuum steel degassing units are lined with___________?
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Which brick undergoes maximum shrinkage on drying ?
40 / 65
Thermal conductivity of refractory bricks__________?
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Which is not a basic refractory ?
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Which of the following is not an acidic refractory?
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Which of the following has the lowest electrical resistivity ?
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Thermal diffusivity of a refractory brick is high, when its _____ is high?
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Which of the following is not a neutral refractory ?
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Which furnace consumes maximum refractory annually in an integrated steel plant ?
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Which is the stable form of silica below 870?C ?
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Which is a basic refractory ?
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Spalling of a refractory means its______?
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Which one contains maximum percentage of Al2O3 ?
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With increase in the alumina content, the refractoriness of high alumina refractories________?
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Thermal spalling mainly occurs during ______ of furnaces?
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What is the value of ?q? for saturated liquid feed to a distillation column ?
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Spalling tendency of refractories is reduced by increasing its__________?
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Which one contains minimum percentage of SiO2 ?
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Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
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Which is not an alumino-silicate refractory ?
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SiO2 percentage in firebrick is about______?
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Which is not a high alumina refractory ?
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Zirconia refractories are not used in_______?
61 / 65
Use of higher percentage of lime for bonding silica bricks, reduces their___________?
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Walls, roofs & combustion chambers of annealing furnaces are made of _______ bricks?
63 / 65
The highest melting pure oxide (m.p. > 3000?C)is_____?
64 / 65
With increase in the porosity, thermal spalling resistance of fireclay brick_____?
65 / 65
Tar dolomite bricks are used in the__________?
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