Magnesite refractories are used for the construction of those furnaces, which are

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

Magnesite refractories are generally not used in the

A

Electric furnace walls

B

Steel melting furnace

C

Open hearth furnace

D

Burning zone of cement kilns

Magnesite refractories have low resistance to

A

Attack by basic slag

B

Abrasion

C

Disintegration on sudden change of temperature

D

Both B and C

Magnesite chrome refractories

A

Have better spalling resistance than chrome magnesite refractories

B

Have very low thermal co-efficient of expansion

C

Are not at all resistant to the corrosive action of iron oxide

D

Have very low (50 kg/cm²) cold crushing strength (C.C.S.) and can not be used in metalcase form

Faster rate of drying of moulded refractories results in high __________ of refractories.

A

Green strength

B

Voids

C

Shrinkage

D

Both B and C

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

Chrome magnesite is not used in the

A

Inner lining of L.D. converter

B

Aluminium melting furnaces

C

Wear out lining of steel melting furnaces

D

All of the above

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

Chrome magnesite brick is not used for lining the

A

Hearth of soaking pits

B

Bottom hearth of reheating furnace

C

Coke oven regenerator

D

Burning zone of limestone rotary kilns

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

A

Al₂O₃

B

CaO

C

SiO₂

D

All of the above

Magnesite refractories are used for the construction of those furnaces, which are

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