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Refractory Technology

Refractory Technology
Firing temperature of magnesite bricks is about __________ °C.

800-1000
1600-1800
1000-1200
2400-2600

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Refractory Technology
Periclase is

MgCO₃
Amorphous magnesite
ZrSO₄
Crystalline form of MgO

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Refractory Technology
Tar dolomite bricks are used in the

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

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Refractory Technology
Segar cones are used for the determination of __________ of refractories.

Spalling resistance
Electrical conductivity
Softening temperature
Resistance to slag attack

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Refractory Technology
Which is not a high alumina refractory?

Bauxite
Dolomite
Corrundum
Mullite

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Refractory Technology
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .

250
450
65
150

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