A combination of refractory grain and suitable bonding agent that after

A combination of refractory grain and suitable

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16.A combination of refractory grain and suitable bonding agent that, after addition of a proper liquid, is generally poured into place to form a refractory shape or structure which becomes rigid because of a chemical action is called a) mortarb) castablec)ceramic modulesd)all of the above 17.Compostions of ground refractory materials which develop a strong bond at air ambient temperatures by virtue of chemical reactions withinthe binder phase that is usually activated by water additions. These refractories include cement and phosphate bonded castables is called: 18.Compositions of ground refractory materials which require relatively high temperatures for the development of an adequate bond (commonly called the ceramic bond) is called
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19.Alumina – silica refractories containing 45% or more alumina, materialsused in their production include diaspore, bauxite, gibbsite, kyanite, sillimanite, alusite and fused alumina (artificial corundum) is called 20.A high alumina mineral usually consisting of rounded concretionary grains embedded in clay – like mass, and believed to consist essentially of alumina tri hydrate (Al2O33H2O) and alumina hydrate (Al2O3H2O) in varying proportions is called a) kyaniteb) bauxitec)fused aluminad) alusite 21.Commercially on a calcined basis bauxite must contain at least 22.A natural or synthetic mineral theoretically consisting solely of alumina (Al2O3), specific gravity 4.00 – 4.02, melting point 3720˚ F. (2050˚ C) Hardness 8.8 is called 23.A group of rock minerals having nearly perfect cleavage in one direction and consisting of thin elastic plates and most common varieties are muscovite and biotite is called
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24.A group of impure magnesium silicate minerals that occur in a fiberous form is known as a) Asbestosb)Mineral fibrec)Fused silicad)None of the above 25.Cristobalite is an important constituent of
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  • Spring '18
  • Refractory, Refractory materials, FCCU

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