Refractory Technology
Magnesite bricks are used in those parts of furnaces, which are

Required to resist corrosive basic slag
None of these
Subjected to temperature fluctuation
Subjected to high load

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Refractory Technology
Cermets are

Used in space vehicles, missiles & nuclear energy plants
All of these
Composite material containing both ceramic & metallic constituents
Having high strength & resistance to high temperature

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