logo

CuriousTab

CuriousTab

Discussion


Home Chemical Engineering 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
    • Discuss
    • 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
    • Discuss
    • 3. Mixing of ground refractory material and water is done in a __________ mill.

    • Options
    • A. pug
    • B. ball
    • C. tube
    • D. rod
    • Discuss
    • 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).
    • Discuss
    • 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).
    • Discuss
    • 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
    • Discuss
    • 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)
    • Discuss
    • 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).
    • Discuss
    • 9. Ganister is a source of the

    • Options
    • A. silica
    • B. periclase
    • C. lime
    • D. none of these
    • Discuss
    • 10. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.

    • Options
    • A. 50-100
    • B. 100-150
    • C. 200-400
    • D. 500-1000
    • Discuss


    Comments

    There are no comments.

Enter a new Comment