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Chemical Engineering
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Refractory Technology
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Question
Pick out the wrong statement.
Options
A. Refractories used in muffle furnace should have low thermal conductivity.
B. The electrical resistivity of refractories drops rapidly with rise in temperature.
C. For reducing spalling tendency, the refractory should be well fired and its porosity should be more.
D. Refractoriness under load (RUL) of a refractory is always less than its refractoriness.
Correct Answer
Refractories used in muffle furnace should have low thermal conductivity.
Refractory Technology problems
Search Results
1. High alumina refractory compared to fireclay bricks have
Options
A. less load bearing capacity.
B. less resistance to slag attack.
C. low refractoriness.
D. high resistance to thermal shock and creep.
Show Answer
Scratch Pad
Discuss
Correct Answer: high resistance to thermal shock and creep.
2. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
Options
A. spalling resistance
B. refractoriness
C. crushing strength
D. resistance to slag
Show Answer
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Discuss
Correct Answer: spalling resistance
3. __________ is the measure of the strength of refractory under the combined effect of temperature & load.
Options
A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity
Show Answer
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Discuss
Correct Answer: RUL
4. Ramming masses are used for
Options
A. obtaining monolithic working faces.
B. repairing construction of various furnace parts.
C. both (a) & (b).
D. neither (a) nor (b).
Show Answer
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Discuss
Correct Answer: both (a) & (b).
5. Which is not a high alumina refractory?
Options
A. Mullite
B. Corrundum
C. Bauxite
D. Dolomite
Show Answer
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Discuss
Correct Answer: Dolomite
6. Addition of zircon to silica refractory brick improves its
Options
A. crushing strength
B. resistance to slag attack
C. both (a) and (b)
D. neither (a) nor (b)
Show Answer
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Discuss
Correct Answer: resistance to slag attack
7. Which of the following impurities reduces the refractoriness of magnesite bricks?
Options
A. Al
2
O
3
B. CaO
C. SiO
2
D. all (a), (b) & (c)
Show Answer
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Discuss
Correct Answer: all (a), (b) & (c)
8. Crushing strength of a refractory
Options
A. increases with rise in service temperature.
B. decreases with rise in service temperature.
C. is unaffected with change in service temperature.
D. decreases with increase in porosity.
Show Answer
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Discuss
Correct Answer: decreases with rise in service temperature.
9. Refractory bricks having lower porosity have
Options
A. high insulating properties
B. low heat capacity
C. low thermal conductivity
D. greater strength
Show Answer
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Discuss
Correct Answer: greater strength
10. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
Options
A. fireclay
B. silica
C. dolomite
D. very low alumina
Show Answer
Scratch Pad
Discuss
Correct Answer: silica
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