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.Management Sciences
Category: Refractory Technology
Carbon bricks are not used in the lining of the_________________?
A. Combustion chamber of blast furnace stoves
B. Electric furnaces
C. Highly chemical resistant equipments
D. Blast furnace hearth
‘Spinel’, a refractory mineral is chemically represented as____________________?
A. MgAl2O4
B. MgAl2O3
C. MgSO4
D. MgAl2O3.2H2O
An ideal refractory should have high__________________?
A. Spalling rate
B. Fusion point
C. Shrinkage ability
D. None of these
Mixing of ground refractory material and water is done in a ______________ mill?
A. Pug
B. Ball
C. Tube
D. Rod
Which of the following bricks has the most close values of RUL and PCE ?
A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks
‘Super refractories’ are made from pure____________________?
A. Carbides
B. Oxides
C. Borides
D. Nitrides
With increasing alumina content, the fusion point of high alumina refractories__________________?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on its alumina content
Alumina-graphite bricks are used for lining the ____________________?
A. Slide gate in teeming laddies
B. Continuous casting systems
C. Both A. and B.
D. Neither A. nor B.
Presence of MgO in alumino-silicate refractories _______________ its refractoriness?
A. Increases
B. Lowers
C. Does not affect
D. Either A. or B.; depends on its quantity
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