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Refractory Technology Quiz 1

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Refractory Technology Quiz 1

1 / 50

Crushing strength of a refractory______?

2 / 50

10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the ______ of Chromite?

3 / 50

?Super refractories? are made from pure______?

4 / 50

Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory__________?

5 / 50

An indication of degree of firing in silica brick is its______?

6 / 50

Carbon refractories are exclusively used in the__________?

7 / 50

Chemically, mullite refractories is______?

8 / 50

Except ______, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

9 / 50

Chromite refractories are_______?

10 / 50

______ nozzles are used in continuous casting of steel?

11 / 50

Carbon refractory blocks _____?

12 / 50

Carbon bricks are not used in the lining of the__________?

13 / 50

Chrome magnesite bricks are used in the__________?

14 / 50

A steel member used in the furnace construction to take the thrust of the brickwork is called_____?

15 / 50

?Spinel?, a refractory mineral is chemically represented as______?

16 / 50

Conversion of silica mineral to Cristobalite is accompanied by reduction in its ______?

17 / 50

Chromite refractories_______?

18 / 50

Alumina-graphite bricks are used for lining the ______?

19 / 50

Bauxite calcining rotary kilns are lined with _________ bricks?

20 / 50

Ferromagnetic ceramic material is not used in the___________?

21 / 50

_____ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?

22 / 50

Electrical resistor bars are made of ________?

23 / 50

Carbon refractories_______?

24 / 50

Cold crushing strength of fireclay bricks is about _______ kgf/cm2?

25 / 50

Chrome magnesite bricks are__________?

26 / 50

An ideal refractory should have high___________?

27 / 50

_____ is the measure of the strength of refractory under the combined effect of temperature & load ?

28 / 50

Addition of zircon to silica refractory brick improves its_______?

29 / 50

Colour of fireclay bricks is__________?

30 / 50

Because of its very high refractoriness of the order of __________ ?C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?

31 / 50

Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900?C ) use, except ?

32 / 50

Dolomite bricks have good resistance to attack by_______?

33 / 50

Chromite refractories are used in________?

34 / 50

_______ bricks should not be used in oxidising atmosphere?

35 / 50

Basic bricks are not made of _____?

36 / 50

Dilatometer is used for the determination of _______ of refractories?

37 / 50

Carbon refractories have very high ___________?

38 / 50

Cold crushing strength of refractories depends upon its__________?

39 / 50

Chrome magnesite brick is not used for lining the_____?

40 / 50

______ is not a single oxide-refractory?

41 / 50

Carborundum used for making crucibles for melting non-ferrous metals is chemically_________?

42 / 50

Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500?C, its crushing strength may come down to as low as _______ kg/cm2?

43 / 50

_______ bricks are used in the burning zone of a cement rotary kiln ?

44 / 50

Chrome magnesite is not used in the ______?

45 / 50

Bottom of basic open hearth furnace are constructed of___________?

46 / 50

Cermets are______?

47 / 50

Cold crushing strength of a refractory does not depend upon its ______?

48 / 50

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_______?

49 / 50

Faster rate of drying of moulded refractories results in high ______ of refractories?

50 / 50

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of_________?

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