Resistance to slag attack of a refractory _____________________?

Byadmin March 8, 2019August 26, 2021

Resistance to slag attack of a refractory _____________________?

A. Depends on the nature of slag & refractory
B. Decreases at higher temperature
C. Decreases, if defective joints & cracks exist in the refractory
D. All A., B. and C.

Refractory Technology

Chromite refractories are used in_______________?

Chromite refractories are used in_______________?

A. Bottom of soaking pits
B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action
with each other
C. Both A. & B.
D. Neither A. and B.

Read More Chromite refractories are used in_______________?
Refractory Technology

Chrome magnesite is not used in the ____________________?

Chrome magnesite is not used in the ____________________?

A. Inner lining of L.D. converter
B. Aluminium melting furnaces
C. Wear out lining of steel melting furnaces
D. All A., and B. and C.

Read More Chrome magnesite is not used in the ____________________?
Refractory Technology

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?

A. 10
B. 15
C. 20
D. 30

Read More Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?
Refractory Technology

Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

A. Fireclay
B. Carborundum
C. Graphite
D. Chromite

Read More Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
Refractory Technology

Spalling tendency of refractories is reduced by increasing its_________________?

Spalling tendency of refractories is reduced by increasing its_________________?

A. Porosity
B. Specific gravity
C. Thermal conductivity
D. Strength

Read More Spalling tendency of refractories is reduced by increasing its_________________?
Refractory Technology

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?

A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity
B. High strength & thermal spalling resistance
C. Less addition of water to get a workable plasticity & lesser time required for drying the raw
refractories and hence increased rate of production
D. All A., B. and C.

Read More Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?

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