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MCQs

Total Questions : 137 | Page 6 of 14 pages
Question 51. Which tempering process is used to increase the endurance and elastic limit of the material?
  1.    Low-temperature tempering
  2.    Medium temperature tempering
  3.    High-temperature tempering
  4.    Endurance limit cannot be increased
 Discuss Question
Answer: Option B. -> Medium temperature tempering
Answer: (b).Medium temperature tempering
Question 52. What are the applications of medium temperature tempering?
  1.    Spring and die steels
  2.    Structural steels
  3.    Low alloy steels
  4.    Surface hardened regions
 Discuss Question
Answer: Option A. -> Spring and die steels
Answer: (a).Spring and die steels
Question 53. Quenching of austenite steel for martempering is done using __________
  1.    Furnace
  2.    Still air
  3.    Cooling tower
  4.    Hot oil
 Discuss Question
Answer: Option D. -> Hot oil
Answer: (d).Hot oil
Question 54. How can temperature differences between center and surface be prevented?
  1.    Refined grain structure
  2.    Cooling to room temperature
  3.    Hot working
  4.    Addition of silicon
 Discuss Question
Answer: Option B. -> Cooling to room temperature
Answer: (b).Cooling to room temperature
Question 55. Martempering process is usually employed in _________
  1.    Alloy steels
  2.    Cast irons
  3.    Composites
  4.    Ceramics
 Discuss Question
Answer: Option A. -> Alloy steels
Answer: (a).Alloy steels
Question 56. Martempering is otherwise known as __________
  1.    Interrupted quenching
  2.    Marquenching
  3.    Austempering
  4.    Isothermal quenching
 Discuss Question
Answer: Option B. -> Marquenching
Answer: (b).Marquenching
Question 57. Which of the following is not a disadvantage of austempering?
  1.    Needs to be cold worked
  2.    Needs special bath
  3.    Can be used for limited steels
  4.    Can only be used for small sections
 Discuss Question
Answer: Option A. -> Needs to be cold worked
Answer: (a).Needs to be cold worked
Question 58. Why are bigger sections not used in austempering?
  1.    Unable to cool
  2.    Does not fit in the working apparatus
  3.    Decreased strength
  4.    Cannot be cut
 Discuss Question
Answer: Option A. -> Unable to cool
Answer: (a).Unable to cool
Question 59. It is necessary to carry out _________ after martempering.
  1.    Refining
  2.    Tempering
  3.    Surface hardening
  4.    Cyaniding
 Discuss Question
Answer: Option B. -> Tempering
Answer: (b).Tempering
Question 60. Austempering forms a _________ structure.
  1.    Pearlite
  2.    Bainite
  3.    Spherodite
  4.    Cementite
 Discuss Question
Answer: Option B. -> Bainite
Answer: (b).Bainite

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