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MCQs

Total Questions : 38 | Page 3 of 4 pages
Question 21. Which of the following is an example of a neutral refractory?
  1.    Dolomite
  2.    Magnesia
  3.    Silica
  4.    Chromite
 Discuss Question
Answer: Option D. -> Chromite
Answer: (d).Chromite
Question 22. How much silica do silica refractories usually contain?
  1.    95 – 97%
  2.    0.2 – 1.0%
  3.    1.8 – 3.5%
  4.    0.3 – 0.9%
 Discuss Question
Answer: Option A. -> 95 – 97%
Answer: (a).95 – 97%
Question 23. How much of alumina in weight percent is added to silica refractories?
  1.    0.2 – 1.0
  2.    1.1 – 1.5
  3.    1.6 – 1.8
  4.    > 2.0
 Discuss Question
Answer: Option A. -> 0.2 – 1.0
Answer: (a).0.2 – 1.0
Question 24. What is the fusion temperature of Magnesia?
  1.    1700°C
  2.    2180°C
  3.    2800°C
  4.    3500°C
 Discuss Question
Answer: Option C. -> 2800°C
Answer: (c).2800°C
Question 25. Mullite is an example of ______ refractory.
  1.    Acid
  2.    Basic
  3.    Neutral
  4.    Special
 Discuss Question
Answer: Option D. -> Special
Answer: (d).Special
Question 26. How can the ductility of tungsten be improved?
  1.    Cold working
  2.    Condensation
  3.    Hot working
  4.    Forming
 Discuss Question
Answer: Option A. -> Cold working
Answer: (a).Cold working
Question 27. What is the oxidizing temperature of niobium?
  1.    100°C
  2.    200°C
  3.    400°C
  4.    600°C
 Discuss Question
Answer: Option C. -> 400°C
Answer: (c).400°C
Question 28. Which phase represents the matrix of the alloy?
  1.    Gamma
  2.    Gamma Prime
  3.    Gamma Double Prime
  4.    Carbide
 Discuss Question
Answer: Option A. -> Gamma
Answer: (a).Gamma
Question 29. Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of?
  1.    FCC
  2.    BCC
  3.    BCT
  4.    HCP
 Discuss Question
Answer: Option C. -> BCT
Answer: (c).BCT
Question 30. In which temperature range is Gamma Prime phase of nickel-based superalloys unstable?
  1.    100-200°C
  2.    200-400°C
  3.    600-850°C
  4.    850-1000°C
 Discuss Question
Answer: Option C. -> 600-850°C
Answer: (c).600-850°C

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