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Refractory Technology Quiz 3

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Refractory Technology Quiz 3

1 / 50

Silica bricks are never used for lining the______?

2 / 50

Quartz is_____?

3 / 50

Pick out the wrong statement?

4 / 50

Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in_________?

5 / 50

Silica refractories are not used in __________?

6 / 50

Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is _______ ?C?

7 / 50

Segar cones are used for the determination of _____ of refractories?

8 / 50

Pick out the wrong statement?

9 / 50

Porosity of fireclay refractories is ________ percent?

10 / 50

Semi-silica bricks compared to silica bricks have________?

11 / 50

Silicon carbide refractories are used in the ______?

12 / 50

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for ______ bricks?

13 / 50

PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of _____ ?C?

14 / 50

Pick out the wrong statement ?

15 / 50

Refractoriness/fusion points of ?Superduty? refractories is ________ ?C?

16 / 50

Refractory bricks with lower permeability is produced by using ___________?

17 / 50

Refractory bricks having lower porosity have___________?

18 / 50

Si percentage in silica refractories used in the walls of coke oven is about________?

19 / 50

Pyrometric cone equivalent (PCE) value (Segar cone) of ?Superduty refractories? is more than 33 which corresponds to a temperature of ______ ?C?

20 / 50

Refractories are dried in the ________?

21 / 50

Refractoriness of a typical silica brick corresponds to Segar cone number, ?32?, which is equivalent to a temperature of ______ ?C?

22 / 50

Outer combustion chamber of blast furnace stove is lined with ______ bricks?

23 / 50

Ramming masses are used for______?

24 / 50

Rate of slag attack on refractories increases with rise in temperature due to the_____?

25 / 50

Roof of a basic electric furnace is made of ______ bricks?

26 / 50

Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material ?

27 / 50

Periclase refractory contains mainly_________?

28 / 50

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as ______ percent?

29 / 50

Refractory materials are never used in the construction of __________?

30 / 50

Silica bricks have low spalling resistance below 600?C, due to its_________?

31 / 50

Panel test determines the ______ of refractories?

32 / 50

Resistance to slag attack of a refractory _______?

33 / 50

Porosity is induced in insulating refractories by adding_________?

34 / 50

Presence of MgO in alumino-silicate refractories ________ its refractoriness?

35 / 50

Pick out the wrong statement ?

36 / 50

Silicon carbide refractories have very low _____?

37 / 50

Pick out the wrong statement?

38 / 50

Permeability of bricks is a measure of the__________?

39 / 50

Roof of a basic open hearth furnace is lined with _______ bricks?

40 / 50

Periclase is_____?

41 / 50

RUL of refractories depends on the _______?

42 / 50

Refractoriness under load (RUL) is the most important property for the refractory bricks__________?

43 / 50

Pyrometric cone equivalent (PCE) of a refractory is the measure of its__________?

44 / 50

Pick out the wrong statement ?

45 / 50

Porosity of silica bricks varies from _______ percent?

46 / 50

Rotary kilns meant for calcination of limestone are lined with chrome magnesite in _______ zone?

47 / 50

Refractory castables are used for___________?

48 / 50

Pure oxide refractories are generally monocrystalline in nature and are self bonded ________ bricks are generally used as moderator in nuclear reactors?

49 / 50

Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to___________?

50 / 50

Silica refractories___________?

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