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Refractory Technology

Grog__________________?

August 26, 2021March 8, 2019 by admin
Grog__________________?

A. Contains both alumina and silica
B. Is crushed firebrick
C. Is a non-plastic material
D. All A., B. and C.

Categories Refractory Technology

Which of the following is not an acidic refractory?

August 26, 2021March 8, 2019 by admin
Which of the following is not an acidic refractory?

A. Silica bricks
B. Fireclay bricks
C. Bauxite bricks
D. Magnesia bricks

Categories Refractory Technology

Firing temperature of magnesite bricks is about _____________ °C?

August 26, 2021March 8, 2019 by admin
Firing temperature of magnesite bricks is about _____________ °C?

A. 800-1000
B. 1000-1200
C. 1600-1800
D. 2400-2600

Categories Refractory Technology

Silicon carbide refractories are used in the _____________?

August 26, 2021March 8, 2019 by admin
Silicon carbide refractories are used in the _____________?

A. Muffle furnace
B. Zinc smelting furnace
C. Ceramic recuperators
D. All A., B. and C.

Categories Refractory Technology

Mixing of ground refractory material and water is done in a ______________ mill?

August 26, 2021March 8, 2019 by admin
Mixing of ground refractory material and water is done in a ______________ mill?

A. Pug
B. Ball
C. Tube
D. Rod

Categories Refractory Technology

With increase in the density of silica refractories, its_______________?

August 26, 2021March 8, 2019 by admin
With increase in the density of silica refractories, its_______________?

A. Resistance to slag attack increases
B. Spalling resistance reduces
C. Both A. and B.
D. Neither A. nor B.

Categories Refractory Technology

‘Spinel’, a refractory mineral is chemically represented as____________________?

August 26, 2021March 8, 2019 by admin
‘Sel’, a refractory mineral is chemically represented as____________________?

A. MgAl2O4
B. MgAl2O3
C. MgSO4
D. MgAl2O3.2H2O

Categories Refractory Technology

SiO2 percentage in firebrick is about____________________?

August 26, 2021March 8, 2019 by admin
SiO2 percentage in firebrick is about____________________?

A. 35-40
B. 55-60
C. 80-85
D. > 94

Categories Refractory Technology

Which of the following impurities reduces the refractoriness of magnesite bricks ?

August 26, 2021March 8, 2019 by admin
Which of the following impurities reduces the refractoriness of magnesite bricks ?

A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.

Categories Refractory Technology

Semi-silica bricks compared to silica bricks have_______________?

August 26, 2021March 8, 2019 by admin
Semi-silica bricks compared to silica bricks have_______________?

A. Less fusion point
B. Better spalling resistance
C. Both A. and B.
D. Neither A. not B.

Categories Refractory Technology
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