Which is not an acidic refractory?

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?

A

Cork

B

Saw dust

C

Sand

D

Chemically prepared foam

Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory

A

Mortars

B

Cements

C

Castables

D

None of these

If a refractory contains high content of silicon, it means refractory is

A

Acidic

B

Basic

C

Neutral

D

Brittle

Which of the following is not an acidic refractory?

A

Silica bricks

B

Fireclay bricks

C

Bauxite bricks

D

Magnesia bricks

Which is an acidic refractory?

A

Magnesite

B

Dolomite

C

Fireclay

D

Chrome magnesite

Fusion point of an acidic refractory material is

A

Increased by the addition of basic oxides

B

Reduced by the addition of basic oxides

C

Not affected by the addition of basic oxides

D

Not affected by the addition of basic oxides

Which of the following is not a high alumina refractory material?

A

Kyanite

B

Sillimanite

C

Diaspore

D

Periclase

Which of the following is not a neutral refractory?

A

Silicon carbide

B

Magnesite

C

Chromite

D

Graphite

Which is not a basic refractory?

A

Chrome magnesite

B

Magnesite

C

Dolomite

D

Silicon carbide

Which is not an alumino-silicate refractory?

A

Fireclay bricks

B

Mullite bricks

C

Tar dolomite bricks

D

High alumina bricks

Which is not an acidic refractory?

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