51. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
52. Presence of MgO in alumino-silicate refractories __________ its refractoriness.
53. Fusion point of a basic refractory material is
54. Which is not a natural insulating material?
55. Zirconia refractories are not used in
56. Silica refractories are not used in
57. High alumina refractories are used in the
58. Test piece for determination of RUL of a refractory is heated in a/an
59. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
60. Spalling resistance of a refractory can not be increased by
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