Refractory Technology

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

Byadmin March 8, 2019August 26, 2021

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

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

Refractory Technology

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

A. 55
B. 70
C. 80
D. 90

Read More Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?
Refractory Technology

Which is a basic refractory ?

Which is a basic refractory ?

A. Fireclay
B. Silica
C. Chrome magnesite
D. None of these

Read More Which is a basic refractory ?
Refractory Technology

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

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

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

Read More ‘Spinel’, a refractory mineral is chemically represented as____________________?
Refractory Technology

With increase in the density of silica refractories, its_______________?

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.

Read More With increase in the density of silica refractories, its_______________?
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?

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?

A. 450
B. 250
C. 150
D. 65

Read More 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?
Refractory Technology

Zirconia refractory_________________?

Zirconia refractory_________________?

A. Does not react with basic slags
B. Is produced from baddeleyite
C. Cannot be used as an insulator
D. Has poor electrical conductivity at high temperature

Read More Zirconia refractory_________________?