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Refractory Technology

Refractory Technology
Ferromagnetic ceramic material is not used in the

Television sets
Magnetic switches
Thermal insulation
Transformers

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Refractory Technology
Spalling of a refractory means its

Resistance to chemical action of gases and molten fluxes
Softening
Fracture due to uneven expansion at high temperature
Resistancce to compressive loads

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Refractory Technology
The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

Fireclay
Corundum
Silica
Magnesite

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Refractory Technology
Zirconia refractories are not used in

Furnaces subjected to fluctuating temperature
High frequency induction furnaces in the form of inductors
Making sheaths for thermocouple
Lining high temperature ceramic kilns

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Refractory Technology
RUL of refractories depends on the

Physical structure
Presence of impurities like iron & alkali
Chemical composition
All of these

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Refractory Technology
Tar dolomite bricks are used in the

Basic Bessemer converter
Electric furnaces
All of these
Basic open hearth furnace

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