Refractory Technology Quiz 1
1 / 50
Faster rate of drying of moulded refractories results in high ______ of refractories?
2 / 50
Chemically, mullite refractories is______?
3 / 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 ?
4 / 50
Dilatometer is used for the determination of _______ of refractories?
5 / 50
Ferromagnetic ceramic material is not used in the___________?
6 / 50
_____ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?
7 / 50
Bauxite calcining rotary kilns are lined with _________ bricks?
8 / 50
Carbon refractories are exclusively used in the__________?
9 / 50
Except ______, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
10 / 50
_____ is the measure of the strength of refractory under the combined effect of temperature & load ?
11 / 50
Cold crushing strength of a refractory does not depend upon its ______?
12 / 50
Conversion of silica mineral to Cristobalite is accompanied by reduction in its ______?
13 / 50
An ideal refractory should have high___________?
14 / 50
Cold crushing strength of fireclay bricks is about _______ kgf/cm2?
15 / 50
Chrome magnesite is not used in the ______?
16 / 50
Chrome magnesite bricks are__________?
17 / 50
Electrical resistor bars are made of ________?
18 / 50
Chrome magnesite brick is not used for lining the_____?
19 / 50
Dolomite bricks have good resistance to attack by_______?
20 / 50
?Spinel?, a refractory mineral is chemically represented as______?
21 / 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 ?
22 / 50
Carbon refractories have very high ___________?
23 / 50
______ is not a single oxide-refractory?
24 / 50
Crushing strength of a refractory______?
25 / 50
Colour of fireclay bricks is__________?
26 / 50
_______ bricks should not be used in oxidising atmosphere?
27 / 50
Bottom of basic open hearth furnace are constructed of___________?
28 / 50
Alumina-graphite bricks are used for lining the ______?
29 / 50
Chromite refractories are used in________?
30 / 50
10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the ______ of Chromite?
31 / 50
Addition of zircon to silica refractory brick improves its_______?
32 / 50
Chromite refractories are_______?
33 / 50
Carbon refractories_______?
34 / 50
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory__________?
35 / 50
Chrome magnesite bricks are used in the__________?
36 / 50
______ nozzles are used in continuous casting of steel?
37 / 50
An indication of degree of firing in silica brick is its______?
38 / 50
Carbon refractory blocks _____?
39 / 50
A steel member used in the furnace construction to take the thrust of the brickwork is called_____?
40 / 50
Cold crushing strength of refractories depends upon its__________?
41 / 50
Basic bricks are not made of _____?
42 / 50
Chromite refractories_______?
43 / 50
_______ bricks are used in the burning zone of a cement rotary kiln ?
44 / 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?
45 / 50
Carbon bricks are not used in the lining of the__________?
46 / 50
Cermets are______?
47 / 50
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_______?
48 / 50
Carborundum used for making crucibles for melting non-ferrous metals is chemically_________?
49 / 50
?Super refractories? are made from pure______?
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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