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MCQs

Total Questions : 137 | Page 4 of 14 pages
Question 31. What does CCT diagram stand for?
  1.    Constant-critical-temperature
  2.    Constant-cooling-temperature
  3.    Continuous-cooling-transformation
  4.    Continuous-creep-transformation
 Discuss Question
Answer: Option C. -> Continuous-cooling-transformation
Answer: (c).Continuous-cooling-transformation
Question 32. Austenising of samples for TTT diagram is done __________ temperature.
  1.    At room temperature
  2.    Below melting point
  3.    Above eutectoid temperature
  4.    Above boiling temperature
 Discuss Question
Answer: Option C. -> Above eutectoid temperature
Answer: (c).Above eutectoid temperature
Question 33. Which of the following is not an alternative name for the TTT diagram?
  1.    S curve
  2.    C curve
  3.    Adiabatic curve
  4.    Bain’s curve
 Discuss Question
Answer: Option C. -> Adiabatic curve
Answer: (c).Adiabatic curve
Question 34. The first step in constructing a TTT diagram involves _________ the sample.
  1.    Annealing
  2.    Normalising
  3.    Quenching
  4.    Austenising
 Discuss Question
Answer: Option D. -> Austenising
Answer: (d).Austenising
Question 35. __________ is used to predict quenching reactions in steels.
  1.    Isothermal transformation diagram
  2.    Iron-iron carbide equilibrium diagram
  3.    Continuous cooling transformation diagram
  4.    Logarithm scale
 Discuss Question
Answer: Option A. -> Isothermal transformation diagram
Answer: (a).Isothermal transformation diagram
Question 36. Examination of transformation time after quenching is done ___________
  1.    At room temperature
  2.    Below melting point
  3.    Above eutectoid temperature
  4.    Above boiling temperature
 Discuss Question
Answer: Option A. -> At room temperature
Answer: (a).At room temperature
Question 37. Hot-quenching of eutectoid steels in austenitic condition results in formation of ___________
  1.    Pearlite
  2.    Bainite
  3.    Ferrite
  4.    Cementite
 Discuss Question
Answer: Option B. -> Bainite
Answer: (b).Bainite
Question 38. Rapid quenching of eutectoid steel ___________ transforms the austenite into martensite.
  1.    At room temperature
  2.    Below 320°C
  3.    At 550°C
  4.    Above 723°C
 Discuss Question
Answer: Option D. -> Above 723°C
Answer: (d).Above 723°C
Question 39. Isothermal transformations of eutectoid steel between 723°C and 550°C produces __________ microstructure.
  1.    Pearlite
  2.    Bainite
  3.    Ferrite
  4.    Cementite
 Discuss Question
Answer: Option A. -> Pearlite
Answer: (a).Pearlite
Question 40. Bainite in iron-carbon alloys has a ___________ structure.
  1.    Dendritic
  2.    Non-lamellar
  3.    Linear
  4.    Hexahedral
 Discuss Question
Answer: Option B. -> Non-lamellar
Answer: (b).Non-lamellar

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