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MCQs

Total Questions : 52 | Page 3 of 6 pages
Question 21. Which of these materials is not added to iron for improving its oxidation resistance?
  1.    Nickel
  2.    Chromium
  3.    Aluminum
  4.    Silicon
 Discuss Question
Answer: Option D. -> Silicon
Answer: (d).Silicon
Question 22. How much chromium is required to provide oxidation resistance for use over 1000°C?
  1.    1%
  2.    6%
  3.    12%
  4.    17%
 Discuss Question
Answer: Option D. -> 17%
Answer: (d).17%
Question 23. 10% chromium mixed with ______ can be used up to 1100°C.
  1.    Nickel
  2.    Chromium
  3.    Aluminum
  4.    Silicon
 Discuss Question
Answer: Option A. -> Nickel
Answer: (a).Nickel
Question 24. Which of these metals does not require alloying for oxidation resistance?
  1.    Iron
  2.    Copper
  3.    Aluminum
  4.    Molybdenum
 Discuss Question
Answer: Option C. -> Aluminum
Answer: (c).Aluminum
Question 25. Which of these is not a way to prevent intergranular corrosion?
  1.    Reduction of carbon level
  2.    Quenching
  3.    Addition of carbide forming elements
  4.    Reduction of alloying elements
 Discuss Question
Answer: Option D. -> Reduction of alloying elements
Answer: (d).Reduction of alloying elements
Question 26. _________ is used to prevent duralumin from corrosion.
  1.    Iron
  2.    Kynal
  3.    Titanium
  4.    Alclad
 Discuss Question
Answer: Option D. -> Alclad
Answer: (d).Alclad
Question 27. Galvanized ion is made by dipping low carbon steel in molten zinc at ________
  1.    100°C
  2.    150°C
  3.    200°C
  4.    450°C
 Discuss Question
Answer: Option D. -> 450°C
Answer: (d).450°C
Question 28. How can caustic embrittlement be avoided?
  1.    Addition of nickel
  2.    Increasing potential
  3.    Decreasing carbon
  4.    Adding tannins
 Discuss Question
Answer: Option D. -> Adding tannins
Answer: (d).Adding tannins
Question 29. Season-cracking can be prevented by cold-working of brass at _________
  1.    15°C
  2.    100°C
  3.    300°C
  4.    550°C
 Discuss Question
Answer: Option C. -> 300°C
Answer: (c).300°C
Question 30. Dezincification of brass is prevented by addition of ________
  1.    Nickel
  2.    Zinc
  3.    Arsenic
  4.    Tungsten
 Discuss Question
Answer: Option C. -> Arsenic
Answer: (c).Arsenic

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