71. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
72. Insulating refractories should have
73. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
74. Basic bricks are not made of
75. Alumina-graphite bricks are used for lining the
76. Firing temperature of magnesite bricks is about __________ °C.
77. Maximum safe working temperature for fireclay bricks is about __________ °C.
78. Chemically, mullite refractories is
79. Carbon refractories
80. Carbon refractory blocks
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