Discussion
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- Question
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
- Correct Answer
- 30
- 1. 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). Discuss
- 2. The largest consumer of refractories is the __________ industry.
Options- A. cement
- B. metallurgical
- C. fertiliser
- D. power Discuss
- 3. 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
- 4. Mixing of ground refractory material and water is done in a __________ mill.
Options- A. pug
- B. ball
- C. tube
- D. rod Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. Ganister is a source of the
Options- A. silica
- B. periclase
- C. lime
- D. none of these Discuss
- 9. Cold crushing strength of fireclay bricks is about __________ kgf/cm2.
Options- A. 50-100
- B. 100-150
- C. 200-400
- D. 500-1000 Discuss
- 10. Spalling of a refractory means its
Options- A. softening.
- B. fracture due to uneven expansion at high temperature.
- C. resistancce to compressive loads.
- D. resistance to chemical action of gases and molten fluxes. Discuss
Refractory Technology problems
Search Results
Correct Answer: all (a), (b) and (c).
Correct Answer: metallurgical
Correct Answer: Silica bricks
Correct Answer: pug
Correct Answer: all (a), (b) and (c).
Correct Answer: either (a) or (b)
Correct Answer: all (a), (b) and (c).
Correct Answer: silica
Correct Answer: 200-400
Correct Answer: fracture due to uneven expansion at high temperature.
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