The Following Section consists of Multiple Choice Questions on Refractory Technology.
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Refractory Technology MCQ
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Question 1 of 20
1. Question
1 pointsSkull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
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Question 2 of 20
2. Question
1 pointsFiring temperature of magnesite bricks is about __________ °C.
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Question 3 of 20
3. Question
1 pointsHollow refractory bricks are made by
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Question 4 of 20
4. Question
1 pointsAn indication of degree of firing in silica brick is its
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Question 5 of 20
5. Question
1 pointsPanel test determines the __________ of refractories.
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Question 6 of 20
6. Question
1 pointsFireclay bricks are not used in the
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Question 7 of 20
7. Question
1 pointsFusion point of a basic refractory material is
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Question 8 of 20
8. Question
1 pointsWhich is the stable form of silica between 1470°C and the melting point 1713°C ?
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Question 9 of 20
9. Question
1 pointsTest piece for determination of RUL of a refractory is heated in a/an
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Question 10 of 20
10. Question
1 pointsRoof of a basic electric furnace is made of __________ bricks.
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Question 11 of 20
11. Question
1 pointsMagnesite bricks are used in those parts of furnaces, which are
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Question 12 of 20
12. Question
1 pointsCapacity of a refractory brick to withstand-sudden changes in temperature is denoted by the property called
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Question 13 of 20
13. Question
1 pointsWhich is not a basic refractory ?
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Question 14 of 20
14. Question
1 pointsWhich property of refractories is the most important for top section of the blast furnace?
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Question 15 of 20
15. Question
1 pointsRefractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of __________ °C.
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Question 16 of 20
16. Question
1 pointsBeryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except
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Question 17 of 20
17. Question
1 pointsAn insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture ?
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Question 18 of 20
18. Question
1 pointsThermal diffusivity of a refractory brick is high, when its __________ is high.
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Question 19 of 20
19. Question
1 pointsVacuum steel degassing units are lined with
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Question 20 of 20
20. Question
1 pointsWhich is the stable form of silica below 870°C ?
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Refractory Technology MCQ 2
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Question 1 of 20
1. Question
1 pointsRefractoriness/fusion points of ‘superduty’ refractories is __________ °C.
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Question 2 of 20
2. Question
1 pointsOuter combustion chamber of blast furnace stove is lined with __________ bricks.
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Question 3 of 20
3. Question
1 pointsSpalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
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Question 4 of 20
4. Question
1 pointsWalls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
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Question 5 of 20
5. Question
1 pointsFireclay bricks are used in the
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Question 6 of 20
6. Question
1 pointsWater content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.
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Question 7 of 20
7. Question
1 pointsFiring temperature is minimum (1250-1400 °C) for __________ bricks.
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Question 8 of 20
8. Question
1 pointsWith increase in the alumina content, the refractoriness of high alumina refractories
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Question 9 of 20
9. Question
1 pointsA steel member used in the furnace construction to take the thrust of the brickwork is called
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Question 10 of 20
10. Question
1 pointsWith increase in the porosity, thermal spalling resistance of fireclay brick
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Question 11 of 20
11. Question
1 pointsThoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
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Question 12 of 20
12. Question
1 pointsMaximum alumina content in high alumina refractory can be as high as __________ percent.
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Question 13 of 20
13. Question
1 pointsRefractories are dried in the
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Question 14 of 20
14. Question
1 pointsCermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
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Question 15 of 20
15. Question
1 pointsHot metal runner in blast furnace are lined with __________ bricks.
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Question 16 of 20
16. Question
1 pointsSpray test determines the __________ of refractories.
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Question 17 of 20
17. Question
1 pointsThe linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
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Question 18 of 20
18. Question
1 pointsFusion point of an acidic refractory material is
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Question 19 of 20
19. Question
1 points‘Super refractories’ are made from pure
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Question 20 of 20
20. Question
1 pointsChromite refractories are
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Refractory Technology MCQ 3
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Question 1 of 20
1. Question
1 pointsWhich is the most stable crystalline form of silica at room temperature ?
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Question 2 of 20
2. Question
1 pointsPCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
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Question 3 of 20
3. Question
1 pointsWhich of the following is not an acidic refractory ?
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Question 4 of 20
4. Question
1 pointsElectrical resistor bars are made of
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Question 5 of 20
5. Question
1 pointsWhich is not an alumino-silicate refractory?
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Question 6 of 20
6. Question
1 pointsSi percentage in silica refractories used in the walls of coke oven is about
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Question 7 of 20
7. Question
1 pointsSilica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
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Question 8 of 20
8. Question
1 pointsHigh thermal conductivity of a refractory material is not important, when it is to be used in the
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Question 9 of 20
9. Question
1 pointsMaximum safe working temperature for fireclay bricks is about __________ °C.
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Question 10 of 20
10. Question
1 pointsMaximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
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Question 11 of 20
11. Question
1 pointsFireclay bricks are never used in the
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Question 12 of 20
12. Question
1 pointsWith increasing alumina content, the fusion point of high alumina refractories
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Question 13 of 20
13. Question
1 pointsExcept __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
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Question 14 of 20
14. Question
1 pointsWhich refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
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Question 15 of 20
15. Question
1 pointsSpalling resistance of a refractory can not be increased by
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Question 16 of 20
16. Question
1 pointsFireclay refractories have
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Question 17 of 20
17. Question
1 pointsWhich of the following is not a neutral refractory ?
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Question 18 of 20
18. Question
1 pointsWhich is a basic refractory ?
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Question 19 of 20
19. Question
1 pointsCold crushing strength of a refractory does not depend upon its
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Question 20 of 20
20. Question
1 pointsRefractoriness under load (RUL) is the most important property for the refractory bricks
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Refractory Technology MCQ 4
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Question 1 of 20
1. Question
1 pointsWhich of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
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Question 2 of 20
2. Question
1 points__________ nozzles are used in continuous casting of steel,
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Question 3 of 20
3. Question
1 pointssilicon carbide refractories have very low
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Question 4 of 20
4. Question
1 pointsBasic bricks are not made of
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Question 5 of 20
5. Question
1 pointsWith increase in the alumina content in firebricks, its fusion point (refractoriness)
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Question 6 of 20
6. Question
1 pointsZirconia refractory
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Question 7 of 20
7. Question
1 pointsWhich of the following does not occur during firing/burning of refractories ?
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Question 8 of 20
8. Question
1 pointsHigh density refractory bricks have lower
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Question 9 of 20
9. Question
1 points__________ is not a single oxiderefractory.
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Question 10 of 20
10. Question
1 pointsHigh alumina refractory compared to fireclay bricks have
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Question 11 of 20
11. Question
1 pointsRefractory bricks having lower porosity have
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Question 12 of 20
12. Question
1 pointsIn panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.
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Question 13 of 20
13. Question
1 pointsWhich is not an acidic refractory ?
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Question 14 of 20
14. Question
1 pointsThermal conductivity of refractory bricks
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Question 15 of 20
15. Question
1 pointsDolomite bricks have good resistance to attack by
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Question 16 of 20
16. Question
1 pointsMost Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
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Question 17 of 20
17. Question
1 pointsPick out the wrong statement.
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Question 18 of 20
18. Question
1 points__________ bricks should not be used in oxidising atmosphere.
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Question 19 of 20
19. Question
1 pointsPick out the wrong statement.
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Question 20 of 20
20. Question
1 pointsWhich is not a high alumina refractory ?
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