41. Which furnace consumes maximum refractory annually in an integrated steel plant?
42. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
43. Fireclay bricks are used in the
44. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
45. 'Spinel', a refractory mineral is chemically represented as
46. Pick out the wrong statement.
47. Fireclay bricks are not used in the
48. Spalling of a refractory means its
49. Magnesite chrome refractories
50. Refractory bricks with lower permeability is produced by using
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