Fusion point of an acidic 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

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

Which is not an acidic refractory?

A

Silica

B

Fireclay

C

High alumina refractory

D

Carbon black

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

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

Fusion point of an acidic refractory material is

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