1.
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?

2.
In chemical process equipments, the conical bottom heads used, usually has an apex angle of____________________?

3.
Si percentage in silica refractories used in the walls of coke oven is about______________________?

4.
Chrome magnesite bricks are_________________?

5.
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?

6.
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?

7.
Lower part of hot metal mixer are lined with _____________ bricks?

8.
Bauxite calcining rotary kilns are lined with ________________ bricks?

9.
Spalling of a refractory means its____________________?

10.
The linear thermal expansion of _______________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent?