71. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
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72. Which of the following is not a high alumina refractory material?
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73. Permeability of bricks is a measure of the
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74. Capacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
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75. With increase in the alumina content, the refractoriness of high alumina refractories
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76. Bottom of basic open hearth furnace are constructed of
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77. Zircon refractories have
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