Use of higher percentage of lime for bonding silica bricks, reduces their

Semi-silica bricks compared to silica bricks have

A

Less fusion point

B

Better spalling resistance

C

Both A & B

D

Neither A nor B

A red house is built from red bricks . A blue house is built from blue bricks. A white house is built from white bricks. Then what is a greenhouse made from ?

A

green bricks

B

wood

C

glass

D

steel

The solid brick shown is made of small square shaped bricks of side 1. when the large brick is disassembled into its component small bricks. the total surface area of all the small bricks is how much greater than the surface area of the large brick?

A

32

B

40

C

60

D

72

Silica bricks are never used for lining the

A

Beehive coke ovens

B

By-product coke ovens

C

Dome of blast furnace stoves

D

Roof of open hearth furnace

Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

A

Aluminium phosphate

B

Water

C

Lime

D

Plaster of paris

Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

A

770

B

570

C

270

D

70

Porosity of silica bricks varies from __________ percent.

A

5 to 10

B

20 to 30

C

45 to 60

D

60 to 75

The maximum linear expansion of silica bricks during firing is about __________ percent.

A

0.5

B

1

C

2

D

3.5

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

A

5CaO . 3Al₂O₃

B

3CaO . Al₂O₃

C

3CaO . SiO₂

D

2CaO . SiO₂

A courtyard 25 m long and 16 m broad is to be paved with bricks of dimensions 20 cm by 10 cm. The total number of bricks required is

A

25000

B

20000

C

18000

D

None of these

Use of higher percentage of lime for bonding silica bricks, reduces their

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