51. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
52. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
53. High alumina refractory compared to fireclay bricks have
54. Which is not an alumino-silicate refractory?
55. __________ nozzles are used in continuous casting of steel,
56. Magnesite refractories are used for the construction of those furnaces, which are
57. Natural silica
58. Carborundum used for making crucibles for melting non-ferrous metals is chemically
59. Which one contains minimum percentage of SiO2?
60. Dilatometer is used for the determination of __________ of refractories.
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