61. Segar cones are used for the determination of __________ of refractories.
62. RUL of refractories depends on the
63. Firing of refractory brick is done to
64. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
65. With decrease in porosity, the __________ of the refractories decreases.
66. Tar dolomite bricks are used in the
67. Chromite refractories are used in
68. Carbon refractories have very high
69. Pick out the wrong statement.
70. Fireclay bricks are not used in the
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