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Chemical Engineering
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Refractory Technology
Comments
Question
Porosity is induced in insulating refractories by adding
Options
A. powdered naphthalene.
B. ammonium chloride/sulphate.
C. calcium phosphate.
D. all (a), (b) and (c).
Correct Answer
all (a), (b) and (c).
Refractory Technology problems
Search Results
1. The largest consumer of refractories is the __________ industry.
Options
A. cement
B. metallurgical
C. fertiliser
D. power
Show Answer
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Discuss
Correct Answer: metallurgical
2. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?
Options
A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite
Show Answer
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Discuss
Correct Answer: Silica bricks
3. Mixing of ground refractory material and water is done in a __________ mill.
Options
A. pug
B. ball
C. tube
D. rod
Show Answer
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Discuss
Correct Answer: pug
4. Hot face insulating linings of high purity alumina fused mullite are used, where
Options
A. very high temperatures are involved.
B. highly reducing conditions are involved.
C. presence of iron or silica is harmful.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
5. Magnesite refractories have low resistance to
Options
A. attack by basic slag.
B. abrasion.
C. disintegration on sudden change of temperature.
D. both (b) and (c).
Show Answer
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Discuss
Correct Answer: both (b) and (c).
6. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
Options
A. 10
B. 15
C. 20
D. 30
Show Answer
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Discuss
Correct Answer: 30
7. Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
Options
A. oxidising
B. neutral
C. either (a) or (b)
D. neither (a) nor (b)
Show Answer
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Correct Answer: either (a) or (b)
8. Magnesite chrome bricks are used in the
Options
A. roof lining of basic open hearth & other basic furnaces.
B. reheating furnaces.
C. soaking pits.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
9. Ganister is a source of the
Options
A. silica
B. periclase
C. lime
D. none of these
Show Answer
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Discuss
Correct Answer: silica
10. Cold crushing strength of fireclay bricks is about __________ kgf/cm
2
.
Options
A. 50-100
B. 100-150
C. 200-400
D. 500-1000
Show Answer
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Discuss
Correct Answer: 200-400
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