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Refractory Technology Quiz 4

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Refractory Technology Quiz 4

1 / 65

Which is the most stable crystalline form of silica at room temperature ?

2 / 65

Which of the following bricks should not be used, if the furnace is to be used intermittently ?

3 / 65

Which is not an acidic refractory ?

4 / 65

Which of the following bricks has the most close values of RUL and PCE ?

5 / 65

Zirconia refractory__________?

6 / 65

Thermal spalling mainly occurs during ______ of furnaces?

7 / 65

Which one contains maximum percentage of Al2O3 ?

8 / 65

Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the__________?

9 / 65

Which is the stable form of silica between 1470?C and the melting point 1713?C ?

10 / 65

Which is an acidic refractory ?

11 / 65

Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?

12 / 65

With increase in the alumina content, the refractoriness of high alumina refractories________?

13 / 65

Which is not an alumino-silicate refractory ?

14 / 65

Which of the following is not a neutral refractory ?

15 / 65

Vacuum steel degassing units are lined with___________?

16 / 65

Spray test determines the ______ of refractories?

17 / 65

Which of the following does not occur during firing/burning of refractories ?

18 / 65

Test piece for determination of RUL of a refractory is heated in a/an______?

19 / 65

Which is a basic refractory ?

20 / 65

With increase in the porosity, thermal spalling resistance of fireclay brick_____?

21 / 65

Spalling of a refractory means its______?

22 / 65

Water content in ground refractory material to be shaped into bricks by hand moulding is about _______ percent?

23 / 65

Zirconia refractories are not used in_______?

24 / 65

Which is not a basic refractory ?

25 / 65

With decrease in porosity, the _______ of the refractories decreases?

26 / 65

The highest melting pure oxide (m.p. > 3000?C)is_____?

27 / 65

Spalling tendency of refractories is reduced by increasing its__________?

28 / 65

The maximum linear expansion of silica bricks during firing is about _______ percent?

29 / 65

Zircon refractories have___________?

30 / 65

Thoria___________?

31 / 65

Spalling resistance of a refractory cannot be increased by ______?

32 / 65

Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?

33 / 65

Which of the following is not an acidic refractory?

34 / 65

Which is the stable form of silica below 870?C ?

35 / 65

Tar dolomite bricks are used in the__________?

36 / 65

With increase in the alumina content in firebricks, its fusion point (refractoriness) ?

37 / 65

Use of higher percentage of lime for bonding silica bricks, reduces their___________?

38 / 65

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with ______ bricks?

39 / 65

Which of the following impurities reduces the refractoriness of magnesite bricks ?

40 / 65

Which of the following is not a high alumina refractory material ?

41 / 65

Which is not a natural insulating material ?

42 / 65

SiO2 percentage in firebrick is about______?

43 / 65

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

44 / 65

With increasing alumina content, the fusion point of high alumina refractories___________?

45 / 65

Which of the following has the lowest electrical resistivity ?

46 / 65

Which one contains minimum percentage of SiO2 ?

47 / 65

Which one expands on heating ?

48 / 65

To resist spalling tendency, a refractory should have_________?

49 / 65

Which is not a high alumina refractory ?

50 / 65

Thermal diffusivity of a refractory brick is high, when its _____ is high?

51 / 65

Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its________?

52 / 65

Sillimanite is a ______ refractory?

53 / 65

Tar bonded dolomite bricks___________?

54 / 65

Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of_______?

55 / 65

Thermal conductivity of refractory bricks__________?

56 / 65

Which is required in an insulating refractory ?

57 / 65

Walls, roofs & combustion chambers of annealing furnaces are made of _______ bricks?

58 / 65

With increase in the density of silica refractories, its________?

59 / 65

Which form of silica has the highest specific gravity ?

60 / 65

What is the value of ?q? for saturated liquid feed to a distillation column ?

61 / 65

The largest consumer of refractories is the ________ industry?

62 / 65

Which furnace consumes maximum refractory annually in an integrated steel plant ?

63 / 65

The main raw material for manufacture of silicon carbide refractories is__________?

64 / 65

Which brick undergoes maximum shrinkage on drying ?

65 / 65

The linear thermal expansion of ________ bricks upto 1000 ?C is very low of the order of ? 0.5 percent?

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