Crushing strength of a refractory____________________?

Byadmin March 8, 2019August 26, 2021

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

Refractory Technology

Refractory bricks having lower porosity have_________________________?

Refractory bricks having lower porosity have_________________________?

A. High insulating properties
B. Low heat capacity
C. Low thermal conductivity
D. Greater strength

Read More Refractory bricks having lower porosity have_________________________?
Refractory Technology

Porosity of silica bricks varies from ______________ percent?

Porosity of silica bricks varies from ______________ percent?

A. 5 to 10
B. 20 to 30
C. 45 to 60
D. 60 to 75

Read More Porosity of silica bricks varies from ______________ percent?
Refractory Technology

High alumina refractories are used in the ___________________?

High alumina refractories are used in the ___________________?

A. Dome of blast furnace stoves
B. Electric arc furnace roof
C. Glass melting furnaces
D. All A., B. and C.

Read More High alumina refractories are used in the ___________________?
Refractory Technology

Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000

Read More Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?
Refractory Technology

Spalling of a refractory means its____________________?

Spalling of a refractory means its____________________?

A. Softening
B. Fracture due to uneven expansion at high temperature
C. Resistance to compressive loads
D. Resistance to chemical action of gases and molten fluxes

Read More Spalling of a refractory means its____________________?
Refractory Technology

Fusion point of a basic refractory material is__________________?

Fusion point of a basic refractory material is__________________?

A. Reduced by the addition of acid oxides
B. Increased by the addition of acid oxides
C. Not affected by the addition of acid oxides
D. Always less than 1000°C

Read More Fusion point of a basic refractory material is__________________?

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