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chemical engineering refractory technology MCQs

Practise multiple-choice questions from chemical engineering refractory technology for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering refractory technology Mcqs
1. Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
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A. Resistance to carbon monoxide attack

B. Resistance to slag penetration

C. Fusion point

D. Spalling resistance

2. With increasing alumina content, the fusion point of high alumina refractories__________________?
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A. Decreases

B. May increase or decrease; depends on its alumina content

C. Increases

D. Remain constant

3. Magnesite refractories have low resistance to___________________?
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A. Attack by basic slag

B. Abrasion

C. Disintegration on sudden change of temperature

D. Both B. and C.
4. What is the value of q for saturated liquid feed to a distillation column ?
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A. 0

B. <1

C. 1

D. >1

5. Carbon refractories are exclusively used in the_________________?
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A. Side wall of soaking pits

B. Regenerators of coke oven

C. Hearth of blast furnace

D. Walls of coke oven

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

B. Fireclay

C. Carborundum

D. Graphite
7. Which is a basic refractory ?
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A. Chrome magnesite

B. Fireclay

C. Silica

D. None of these

8. Silicon carbide refractories have very low ___________________?
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A. Refractoriness (< 1700C)

B. Thermal conductivity

C. Resistance to thermal shock

D. None of these
9. SiO2 percentage in firebrick is about____________________?
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A. > 94

B. 55-60

C. 80-85

D. 35-40

10. Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?
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A. At the hearth bottom of the furnace on which stock is placed

B. Used for furnace insulation

C. Used in the roof of the furnace

D. None of these

11. Electrical resistor bars are made of _______________?
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A. Zirconia

B. Graphite

C. Silicon carbide

D. Alumina

12. Which of the following impurities reduces the refractoriness of magnesite bricks ?
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A. CaO

B. SiO2

C. Al2O3

D. All A., B. & C.
13. Hollow refractory bricks are made by___________________?
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A. Extrusion

B. pressing/machine moulding

C. Hand moulding

D. Slip casting
14. Which of the following bricks has the most close values of RUL and PCE ?
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A. Silica bricks

B. Fireclay bricks

C. High alumina bricks

D. Tar dolomite bricks

15. Carbon bricks are not used in the lining of the_________________?
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A. Highly chemical resistant equipments

B. Combustion chamber of blast furnace stoves

C. Blast furnace hearth

D. Electric furnaces

16. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?
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A. Oxidising

B. Either A. or B.

C. Neutral

D. Neither A. nor B.

17. Crushing strength of a refractory____________________?
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A. Is unaffected with change in service temperature

B. Increases with rise in service temperature

C. Decreases with rise in service temperature

D. Decreases with increase in porosity

18. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
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A. High thermal conductivity

B. None of these

C. High crushing strength

D. Non-wetting characteristic
19. Firing of refractory brick is done to __________________?
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A. duct

B. Develop stable mineral forms in them

C. All A., B. and C.

D. Dehydrate the dried refractory

E. Form ceramic bonds necessary for development of high crushing strength in the finished

20. Chrome magnesite bricks are used in the_________________?
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A. Copper melting furnaces & converters

B. Burner block of glass tanks

C. All A., B. and C.

D. Side walls of soaking pits and arc furnaces