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MCQs

Total Questions : 137 | Page 14 of 14 pages
Question 131. Microstructure containing ferrite is termed as _________
  1.    Dark area
  2.    White network
  3.    Red area
  4.    Blue zone
 Discuss Question
Answer: Option B. -> White network
Answer: (b).White network
Question 132. Which among the following media of quenching the slowest?
  1.    Caustic soda
  2.    Sodium chloride
  3.    Mineral oil
  4.    Air
 Discuss Question
Answer: Option D. -> Air
Answer: (d).Air
Question 133. Which quenching medium is used for quenching of carbon and low alloy steels?
  1.    Vegetable oil
  2.    Water
  3.    Air
  4.    Animal oil
 Discuss Question
Answer: Option B. -> Water
Answer: (b).Water
Question 134. Vapour-jacket cooling stage of quenching process occurs _________
  1.    Below boiling point
  2.    Above boiling point
  3.    Below melting point
  4.    At recrystallization temperature
 Discuss Question
Answer: Option B. -> Above boiling point
Answer: (b).Above boiling point
Question 135. Which stage of quenching is the slowest?
  1.    Vapour-Jacket
  2.    Vapour-Transport cooling
  3.    Liquid-Cooling
  4.    They are all equally slow
 Discuss Question
Answer: Option C. -> Liquid-Cooling
Answer: (c).Liquid-Cooling
Question 136. The CCT or the TTT diagrams are used for _________
  1.    One steel of specific composition
  2.    A family of various steels
  3.    Alloy system of various compositions
  4.    Combination of all alloys and steels with various compositions
 Discuss Question
Answer: Option A. -> One steel of specific composition
Answer: (a).One steel of specific composition
Question 137. Non-equilibrium phases are shown for their time and transformation using _________
  1.    Fe-Fe₃C diagram
  2.    TTT diagram
  3.    CCT diagram
  4.    TTT and CCT diagram
 Discuss Question
Answer: Option D. -> TTT and CCT diagram
Answer: (d).TTT and CCT diagram

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