Fusion point of a basic refractory material is

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

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

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

Resistance to fusion of the refractory under a steady rising temperature condition is called

A

Spalling

B

Refractoriness

C

Both A & B

D

Neither A nor B

Point A is 10 miles West of Point B. Point b is 30 miles North of pint C. Point C is 20 miles East of Point D. What is the distance (in miles) between Point A and Point D?

A

1010

B

1020

C

2010

D

3010

Point A is 10 km west of point B. Point B is 30 km north of point C. Point C is 20 km east of point D. What is the distance between point A and D?

A

1020Km

B

1010Km

C

2010Km

D

3010Km

Which is not a basic refractory?

A

Chrome magnesite

B

Magnesite

C

Dolomite

D

Silicon carbide

The refractory lining of the bottom in a basic electric arc furnace is made of

A

Silica

B

Alumina

C

Magnesia

D

Fireclay

Which is a basic refractory?

A

Fireclay

B

Silica

C

Chrome magnesite

D

None of these

Fusion point of a basic refractory material is

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