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MCQs

Total Questions : 868 | Page 84 of 87 pages
Question 831. With decrease in porosity, the ______________ of the refractories decreases?
  1.    Strength
  2.    Thermal conductivity
  3.    Spalling resistance
  4.    None of these
 Discuss Question
Answer: Option C. -> Spalling resistance
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 832. Magnesite bricks have poor resistance to attack by _____________ slag?
  1.    Lime
  2.    Basic
  3.    Acid
  4.    None of these
 Discuss Question
Answer: Option C. -> Acid
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 833. Mullite is chemically represented by_________________?
  1.    Al2O3. 2SiO2
  2.    3Al2O3. 2SiO2
  3.    Al2O3. SiO2
  4.    2Al2O3. 3SiO2
 Discuss Question
Answer: Option B. -> 3Al2O3. 2SiO2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 834. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?
  1.    55
  2.    70
  3.    80
  4.    90
 Discuss Question
Answer: Option D. -> 90
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 835. Which is not a natural insulating material ?
  1.    Diatomaceous earth/kieselgur
  2.    Asbestos
  3.    Vermiculite
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 836. Which one contains minimum percentage of SiO2 ?
  1.    Firebrick
  2.    Sillimanite
  3.    Semi-silica
  4.    Aluminous firebrick
 Discuss Question
Answer: Option B. -> Sillimanite
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 837. ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
  1.    Porosity
  2.    RUL
  3.    Specific gravity
  4.    Thermal conductivity
 Discuss Question
Answer: Option B. -> RUL
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 838. Which of the following is not a high alumina refractory material ?
  1.    Kyanite
  2.    Sillimanite
  3.    Diaspore
  4.    Periclase
 Discuss Question
Answer: Option D. -> Periclase
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 839. ______________ bricks should not be used in oxidising atmosphere?
  1.    Tar dolomite
  2.    Carbon
  3.    Silica
  4.    Fireclay
 Discuss Question
Answer: Option B. -> Carbon
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 840. High alumina refractory compared to fireclay bricks have____________________?
  1.    Less load bearing capacity
  2.    Less resistance to slag attack
  3.    Low refractoriness
  4.    High resistance to thermal shock and creep
 Discuss Question
Answer: Option D. -> High resistance to thermal shock and creep
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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