Refractory Technology Quiz 4
1 / 65
What is the value of ?q? for saturated liquid feed to a distillation column ?
2 / 65
Which of the following is not a high alumina refractory material ?
3 / 65
Thermal diffusivity of a refractory brick is high, when its _____ is high?
4 / 65
Test piece for determination of RUL of a refractory is heated in a/an______?
5 / 65
Which is not an alumino-silicate refractory ?
6 / 65
Which is a basic refractory ?
7 / 65
Which of the following bricks should not be used, if the furnace is to be used intermittently ?
8 / 65
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
9 / 65
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with ______ bricks?
10 / 65
Which brick undergoes maximum shrinkage on drying ?
11 / 65
Walls, roofs & combustion chambers of annealing furnaces are made of _______ bricks?
12 / 65
Spalling of a refractory means its______?
13 / 65
Which is required in an insulating refractory ?
14 / 65
Which is not an acidic refractory ?
15 / 65
Thermal conductivity of refractory bricks__________?
16 / 65
With increase in the porosity, thermal spalling resistance of fireclay brick_____?
17 / 65
To resist spalling tendency, a refractory should have_________?
18 / 65
Tar bonded dolomite bricks___________?
19 / 65
Which one contains maximum percentage of Al2O3 ?
20 / 65
Zircon refractories have___________?
21 / 65
Which of the following has the lowest electrical resistivity ?
22 / 65
Which one contains minimum percentage of SiO2 ?
23 / 65
Vacuum steel degassing units are lined with___________?
24 / 65
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its________?
25 / 65
Sillimanite is a ______ refractory?
26 / 65
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of_______?
27 / 65
The highest melting pure oxide (m.p. > 3000?C)is_____?
28 / 65
Tar dolomite bricks are used in the__________?
29 / 65
Which is not a high alumina refractory ?
30 / 65
With increase in the alumina content in firebricks, its fusion point (refractoriness) ?
31 / 65
Spalling tendency of refractories is reduced by increasing its__________?
32 / 65
With increase in the alumina content, the refractoriness of high alumina refractories________?
33 / 65
Spalling resistance of a refractory cannot be increased by ______?
34 / 65
Which of the following is not an acidic refractory?
35 / 65
The linear thermal expansion of ________ bricks upto 1000 ?C is very low of the order of ? 0.5 percent?
36 / 65
Spray test determines the ______ of refractories?
37 / 65
Which is an acidic refractory ?
38 / 65
Use of higher percentage of lime for bonding silica bricks, reduces their___________?
39 / 65
Which of the following impurities reduces the refractoriness of magnesite bricks ?
40 / 65
Which is the most stable crystalline form of silica at room temperature ?
41 / 65
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the__________?
42 / 65
Which of the following bricks has the most close values of RUL and PCE ?
43 / 65
SiO2 percentage in firebrick is about______?
44 / 65
Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
45 / 65
Zirconia refractory__________?
46 / 65
Which one expands on heating ?
47 / 65
The maximum linear expansion of silica bricks during firing is about _______ percent?
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The largest consumer of refractories is the ________ industry?
49 / 65
The main raw material for manufacture of silicon carbide refractories is__________?
50 / 65
Which is the stable form of silica below 870?C ?
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Which form of silica has the highest specific gravity ?
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With increase in the density of silica refractories, its________?
53 / 65
Which is not a natural insulating material ?
54 / 65
Which furnace consumes maximum refractory annually in an integrated steel plant ?
55 / 65
Which is the stable form of silica between 1470?C and the melting point 1713?C ?
56 / 65
Thoria___________?
57 / 65
Which is not a basic refractory ?
58 / 65
Thermal spalling mainly occurs during ______ of furnaces?
59 / 65
Zirconia refractories are not used in_______?
60 / 65
With decrease in porosity, the _______ of the refractories decreases?
61 / 65
Water content in ground refractory material to be shaped into bricks by hand moulding is about _______ percent?
62 / 65
With increasing alumina content, the fusion point of high alumina refractories___________?
63 / 65
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
64 / 65
Which of the following does not occur during firing/burning of refractories ?
65 / 65
Which of the following is not a neutral refractory ?
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