11. Porosity is induced in insulating refractories by adding
12. A steel member used in the furnace construction to take the thrust of the brickwork is called
13. Pick out the wrong statement.
14. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
15. Which is a basic refractory?
16. Which one expands on heating?
17. Fireclay bricks are never used in the
18. High density refractory bricks have lower
19. Zircon refractories have
20. Zirconia refractory
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