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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


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    • 1. Refractory materials are never used in the construction of

    • Options
    • A. segar cones
    • B. orton cones
    • C. pressure vessels
    • D. ovens & retorts
    • Discuss
    • 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.
    • Discuss
    • 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.
    • Discuss
    • 4. Lower part of hot metal mixer are lined with __________ bricks.

    • Options
    • A. superduty fireclay
    • B. high alumina
    • C. silica
    • D. carborundum
    • Discuss
    • 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
    • Discuss
    • 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)
    • Discuss
    • 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)
    • Discuss
    • 8. Ion exchange resins are made of

    • Options
    • A. lucite
    • B. sulphonated bakelite
    • C. polystyrene
    • D. teflon
    • Discuss
    • 9. __________ polymer is produced by the copolymerisation of vinyl chloride-vinyl acetate.

    • Options
    • A. Fibrous
    • B. Leathery
    • C. Rubbery
    • D. Hard
    • Discuss
    • 10. Polymethyl methacrylate, which is an acrylic resin, is also called

    • Options
    • A. thiokol
    • B. plexiglass or lucite
    • C. dacron
    • D. teflon
    • Discuss


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