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Refractory Technology

Dilatometer is used for the determination of ______________ of refractories?

August 26, 2021March 8, 2019 by admin
Dilatometer is used for the determination of ______________ of refractories?

A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL

Categories Refractory Technology

Highest melting (m.p = 3070°C) oxide refractory is__________________?

August 26, 2021March 8, 2019 by admin
Highest melting (m.p = 3070°C) oxide refractory is__________________?

A. Alumina
B. Thoria
C. Zirconia
D. Magnesia

Categories Refractory Technology

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

August 26, 2021March 8, 2019 by admin
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

A. Bakelite impregnated or fused periclase
B. Silica
C. Semi-silica
D. Fireclay

Categories Refractory Technology

Colour of fireclay bricks is_________________?

August 26, 2021March 8, 2019 by admin
Colour of fireclay bricks is_________________?

A. Light buff to reddish buff
B. Yellow
C. Black
D. None of these

Categories Refractory Technology

Crushing strength of a refractory____________________?

August 26, 2021March 8, 2019 by admin
Crushing strength of a refractory____________________?

A. Increases with rise in service temperature
B. Decreases with rise in service temperature
C. Is unaffected with change in service temperature
D. Decreases with increase in porosity

Categories Refractory Technology

The largest consumer of refractories is the _______________ industry?

August 26, 2021March 8, 2019 by admin
The largest consumer of refractories is the _______________ industry?

A. Cement
B. Metallurgical
C. Fertiliser
D. Power

Categories Refractory Technology

The highest melting pure oxide (m.p. > 3000°C)is___________________?

August 26, 2021March 8, 2019 by admin
The highest melting pure oxide (m.p. > 3000°C)is___________________?

A. Thoria
B. Alumina
C. Beryllia
D. Zirconia

Categories Refractory Technology

Zirconia refractories are not used in_____________________?

August 26, 2021March 8, 2019 by admin
Zirconia refractories are not used in_____________________?

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

Categories Refractory Technology

Dolomite bricks have good resistance to attack by_____________________?

August 26, 2021March 8, 2019 by admin
Dolomite bricks have good resistance to attack by_____________________?

A. Molten steel
B. Iron oxide
C. Lime slag
D. None of these

Categories Refractory Technology

Fireclay refractories have __________________?

August 26, 2021March 8, 2019 by admin
Fireclay refractories have __________________?

A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost

Categories Refractory Technology
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