Magnesite bricks have poor resistance to attack by __________ slag.

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

Firing temperature of magnesite bricks is about __________ °C.

A

800-1000

B

1000-1200

C

1600-1800

D

2400-2600

Maximum apparent porosity of magnesite bricks is about __________ percent.

A

8

B

24

C

44

D

58

Magnesite chrome bricks are used in the

A

Roof lining of basic open hearth & other basic furnaces

B

Reheating furnaces

C

Soaking pits

D

All of the above

Magnesite bricks are used in those parts of furnaces, which are

A

Subjected to temperature fluctuation

B

Required to resist corrosive basic slag

C

Subjected to high load

D

None of these

Which of the following impurities reduces the refractoriness of magnesite bricks?

A

Al₂O₃

B

CaO

C

SiO₂

D

All of the above

Chrome magnesite bricks are

A

Acidic in nature

B

Neutral in nature

C

Having higher RUL than silica bricks

D

Made by mixing 30% chromite and 70% periclase

Chrome magnesite bricks are used in the

A

Side walls of soaking pits and arc furnaces

B

Copper melting furnaces & converters

C

Burner block of glass tanks

D

All of the above

Resistance to slag attack of a refractory

A

Depends on the nature of slag & refractory

B

Decreases at higher temperature

C

Decreases, if defective joints & cracks exist in the refractory

D

All of the above

Magnesite bricks have poor resistance to attack by __________ slag.

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