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Chemical Engineering
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Refractory Technology
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Question
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
Options
A. mortars
B. cements
C. castables
D. none of these
Correct Answer
castables
Refractory Technology problems
Search Results
1. Refractory materials are never used in the construction of
Options
A. segar cones
B. orton cones
C. pressure vessels
D. ovens & retorts
Show Answer
Scratch Pad
Discuss
Correct Answer: pressure vessels
2. Pick out the wrong statement.
Options
A. Fluxing material like lime is added in clay to reduce the vitrification temperature.
B. Main constituents of clay are alumina and silica.
C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning.
D. Vitrification of fireclay material is done to increase its porosity.
Show Answer
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Discuss
Correct Answer: Vitrification of fireclay material is done to increase its porosity.
3. Pick out the wrong statement.
Options
A. Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
B. Graphite and metals are the good electrical conductor among the refractories and others are all electrical insulators.
C. Refractories used for lining electrical furnaces should ordinarily have very low electrical conductivity.
D. Electrical conductivity of porous refractory material is low.
Show Answer
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Discuss
Correct Answer: Electrical conductivity of refractory is not important, when these are to be used in electrical furnaces.
4. Lower part of hot metal mixer are lined with __________ bricks.
Options
A. superduty fireclay
B. high alumina
C. silica
D. carborundum
Show Answer
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Discuss
Correct Answer: carborundum
5. Segar cones are used for the determination of __________ of refractories.
Options
A. softening temperature
B. spalling resistance
C. electrical conductivity
D. resistance to slag attack
Show Answer
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Discuss
Correct Answer: softening temperature
6. Fireclay bricks are used in the
Options
A. furnaces allowed to cool frequently
B. flues
C. chimney linings
D. all (a), (b) and (c)
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c)
7. Chromite refractories are used in
Options
A. bottom of soaking pits.
B. between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other.
C. both (a) & (b)
D. neither (a) and (b)
Show Answer
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Correct Answer: both (a) & (b)
8. Ion exchange resins are made of
Options
A. lucite
B. sulphonated bakelite
C. polystyrene
D. teflon
Show Answer
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Discuss
Correct Answer: sulphonated bakelite
9. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.
Options
A. Fibrous
B. Leathery
C. Rubbery
D. Hard
Show Answer
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Discuss
Correct Answer: Leathery
10. Polymethyl methacrylate, which is an acrylic resin, is also called
Options
A. thiokol
B. plexiglass or lucite
C. dacron
D. teflon
Show Answer
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Discuss
Correct Answer: plexiglass or lucite
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