Which of the following has the lowest electrical resistivity ?
Which of the following has the lowest electrical resistivity ?
A. Graphite
B. Fireclay
C. Alumina
D. Zircon
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Which of the following does not occur during firing/burning of refractories ?
Which of the following does not occur during firing/burning of refractories ?A. Removal of water of hydration
B. Vitrification
C. Decrease in crushing strength
D. Development of stable mineral formMaximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?A. 10
B. 15
C. 20
D. 30Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?A. High duty fireclay
B. Silica
C. Mullite
D. CarborundumWhich of the following bricks has the most close values of RUL and PCE ?
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 bricksFiring of refractory brick is done to __________________?
Firing of refractory brick is done to __________________?A. Dehydrate the dried refractory
B. Develop stable mineral forms in them
C. Form ceramic bonds necessary for development of high crushing strength in the finished
product
D. All A., B. and C.Fireclay bricks are used in the__________________?
Fireclay bricks are used in the__________________?A. Coke ovens regenerator
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke oven walls