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

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

Porosity of silica bricks varies from __________ percent.

A

5 to 10

B

20 to 30

C

45 to 60

D

60 to 75

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

Firing temperature of magnesite bricks is about __________ °C.

A

800-1000

B

1000-1200

C

1600-1800

D

2400-2600

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

A

10

B

15

C

20

D

30

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

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

A

Strength

B

Abrasion resistance

C

Both A & B

D

Neither A nor B

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

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