Refractory Technology Quiz 2
1 / 50
Highest melting (m.p = 3070?C) oxide refractory is___________?
2 / 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?
3 / 50
Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be ___________?
4 / 50
High refractoriness of refractory bricks means, that it has a_________?
5 / 50
Fireclay bricks are never used in the_______?
6 / 50
Ganister is a source of the _________?
7 / 50
Mullite is chemically represented by__________?
8 / 50
Fireclay bricks is not used for lining the___________?
9 / 50
Firing of refractory brick is done to ___________?
10 / 50
Firing temperature of magnesite bricks is about ______ ?C?
11 / 50
Grog addition in fireclay during brick manufacture is done to__________?
12 / 50
High thermal conductivity of a refractory material is not important, when it is to be used in the________?
13 / 50
Magnesite chrome refractories______?
14 / 50
Magnesite refractories are generally not used in the_____?
15 / 50
Hollow refractory bricks are made by_____?
16 / 50
Maximum apparent porosity of magnesite bricks is about ______ percent?
17 / 50
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of _______ percent respectively?
18 / 50
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as _______ percent?
19 / 50
Magnesite refractories are used for the construction of those furnaces, which are_________?
20 / 50
Fusion point of an acidic refractory material is_________?
21 / 50
Graphite or carbon refractories________?
22 / 50
Fireclay bricks are used in the_____?
23 / 50
Fireclay bricks are used in the___________?
24 / 50
Magnesite bricks are used in those parts of furnaces, which are ___________?
25 / 50
High density refractory bricks have lower___________?
26 / 50
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at _______ ?C for 24 hours?
27 / 50
Lower part of hot metal mixer are lined with ______ bricks?
28 / 50
High alumina refractory compared to fireclay bricks have______?
29 / 50
Fusion temperature of pure silica (SiO2) is ________ ?C?
30 / 50
Maximum alumina content in high alumina refractory can be as high as ______ percent?
31 / 50
Maximum water percentage in refractory mix meant for hand moulding may be as high as ______ percent?
32 / 50
Firing temperature is minimum (1250-1400 ?C) for ________ bricks?
33 / 50
Magnesite bricks have poor resistance to attack by ______ slag?
34 / 50
Hot face insulating linings of high purity alumina fused mullite are used, where__________?
35 / 50
Fireclay bricks are not used in the_______?
36 / 50
Maximum safe working temperature for fireclay bricks is about __________ ?C?
37 / 50
Hot blast main (carrying air at 1000?C) in blast furnace are lined with _______ bricks?
38 / 50
Fusion point of a basic refractory material is___________?
39 / 50
Fireclay bricks are not used in the __________?
40 / 50
Magnesite chrome bricks are used in the_____?
41 / 50
Machine moulding of dry mixture of refractories requires a pressure of the order of ______ kg/cm2?
42 / 50
Natural silica_____?
43 / 50
High porosity refractory bricks have ________?
44 / 50
Insulating refractories should have________?
45 / 50
In chemical process equipments, the conical bottom heads used, usually has an apex angle of______?
46 / 50
Grog___________?
47 / 50
High alumina refractories are used in the _____?
48 / 50
Fireclay refractories have ___________?
49 / 50
Mixing of ground refractory material and water is done in a _______ mill?
50 / 50
Magnesite refractories have low resistance to_____?
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