Refractory Technology Quiz 2

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Refractory Technology Quiz 2

1 / 50

High thermal conductivity of a refractory material is not important, when it is to be used in the________?

2 / 50

Magnesite chrome bricks are used in the_____?

3 / 50

Maximum alumina content in high alumina refractory can be as high as ______ percent?

4 / 50

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as _______ percent?

5 / 50

Maximum safe working temperature for fireclay bricks is about __________ ?C?

6 / 50

Maximum water percentage in refractory mix meant for hand moulding may be as high as ______ percent?

7 / 50

Fireclay bricks are used in the___________?

8 / 50

Fireclay bricks is not used for lining the___________?

9 / 50

Magnesite bricks are used in those parts of furnaces, which are ___________?

10 / 50

Mixing of ground refractory material and water is done in a _______ mill?

11 / 50

Magnesite refractories are generally not used in the_____?

12 / 50

Fireclay bricks are used in the_____?

13 / 50

Fireclay refractories have ___________?

14 / 50

Ganister is a source of the _________?

15 / 50

Firing temperature of magnesite bricks is about ______ ?C?

16 / 50

Fireclay bricks are not used in the_______?

17 / 50

High density refractory bricks have lower___________?

18 / 50

Firing temperature is minimum (1250-1400 ?C) for ________ bricks?

19 / 50

Mullite is chemically represented by__________?

20 / 50

Maximum apparent porosity of magnesite bricks is about ______ percent?

21 / 50

Insulating refractories should have________?

22 / 50

Fireclay bricks are not used in the __________?

23 / 50

High alumina refractories are used in the _____?

24 / 50

Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about _______ percent?

25 / 50

Magnesite bricks have poor resistance to attack by ______ slag?

26 / 50

Graphite or carbon refractories________?

27 / 50

Fusion point of a basic refractory material is___________?

28 / 50

Natural silica_____?

29 / 50

Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of _______ percent respectively?

30 / 50

Magnesite refractories are used for the construction of those furnaces, which are_________?

31 / 50

Hollow refractory bricks are made by_____?

32 / 50

Hot blast main (carrying air at 1000?C) in blast furnace are lined with _______ bricks?

33 / 50

In chemical process equipments, the conical bottom heads used, usually has an apex angle of______?

34 / 50

Fusion point of an acidic refractory material is_________?

35 / 50

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _______ ?C for 24 hours?

36 / 50

High refractoriness of refractory bricks means, that it has a_________?

37 / 50

High alumina refractory compared to fireclay bricks have______?

38 / 50

Hot face insulating linings of high purity alumina fused mullite are used, where__________?

39 / 50

High porosity refractory bricks have ________?

40 / 50

Magnesite refractories have low resistance to_____?

41 / 50

Fireclay bricks are never used in the_______?

42 / 50

Grog___________?

43 / 50

Magnesite chrome refractories______?

44 / 50

Fusion temperature of pure silica (SiO2) is ________ ?C?

45 / 50

Grog addition in fireclay during brick manufacture is done to__________?

46 / 50

Highest melting (m.p = 3070?C) oxide refractory is___________?

47 / 50

Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be ___________?

48 / 50

Lower part of hot metal mixer are lined with ______ bricks?

49 / 50

Machine moulding of dry mixture of refractories requires a pressure of the order of ______ kg/cm2?

50 / 50

Firing of refractory brick is done to ___________?

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