11. Hot face insulating linings of high purity alumina fused mullite are used, where
12. With increase in the alumina content in firebricks, its fusion point (refractoriness)
13. Which is required in an insulating refractory?
14. Mixing of ground refractory material and water is done in a __________ mill.
15. Roof of a basic electric furnace is made of __________ bricks.
16. Which of the following is not a neutral refractory?
17. Which is not an acidic refractory?
18. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
19. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
20. Hot metal runner in blast furnace are lined with __________ bricks.
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