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Total Questions : 137 | Page 2 of 14 pages
Question 11. Why is nitriding not used for plain carbon steels?
  1.    Formation of oxides
  2.    Formation of cracks
  3.    Formation of iron nitrides
  4.    Formation of spots
 Discuss Question
Answer: Option C. -> Formation of iron nitrides
Answer: (c).Formation of iron nitrides
Question 12. Which of the following is required for the nitriding process?
  1.    Carbon
  2.    Nitralloy
  3.    Niobium
  4.    Zirconium
 Discuss Question
Answer: Option B. -> Nitralloy
Answer: (b).Nitralloy
Question 13. How long should a steel component be heat treated before nitriding?
  1.    5-20 hours
  2.    40-100 hours
  3.    100-200 hours
  4.    300-500 hours
 Discuss Question
Answer: Option B. -> 40-100 hours
Answer: (b).40-100 hours
Question 14. What is necessary to be done before the nitriding process?
  1.    Heat Treatment
  2.    Washing the material
  3.    Chamfering of sample
  4.    Shaping of material
 Discuss Question
Answer: Option A. -> Heat Treatment
Answer: (a).Heat Treatment
Question 15. Why is atmospheric nitrogen inappropriate for use in the nitriding process?
  1.    Cannot be heated
  2.    Insufficient density
  3.    Inability to be absorbed
  4.    Expensive process
 Discuss Question
Answer: Option C. -> Inability to be absorbed
Answer: (c).Inability to be absorbed
Question 16. Cooling of hypoeutectoid steels in done is furnace by decreasing the temperature to at least ________ below the A1 line.
  1.    4°C
  2.    10°C
  3.    16°C
  4.    30°C
 Discuss Question
Answer: Option D. -> 30°C
Answer: (d).30°C
Question 17. How does heating for hypereutectoid steels differ from hypoeutectoid steels?
  1.    Heated 30-60°C above A1 line
  2.    Heated 30-60°C below A1 line
  3.    Heated 30-60°C below A2 line
  4.    Heated 30-60°C below A3 line
 Discuss Question
Answer: Option A. -> Heated 30-60°C above A1 line
Answer: (a).Heated 30-60°C above A1 line
Question 18. What is the result of full annealing of hypoeutectoid steels?
  1.    Coarse pearlite
  2.    Bainite
  3.    Cementite
  4.    Silicon
 Discuss Question
Answer: Option A. -> Coarse pearlite
Answer: (a).Coarse pearlite
Question 19. Process annealing is applied to which kind of materials?
  1.    Steel castings
  2.    Low carbon steels
  3.    High carbon steels
  4.    Medium carbon steels
 Discuss Question
Answer: Option B. -> Low carbon steels
Answer: (b).Low carbon steels
Question 20. Heating of hypereutectoid steels results in formation of coarse pearlite with excess __________
  1.    Ferrite
  2.    Bainite
  3.    Cementite
  4.    Austenite
 Discuss Question
Answer: Option C. -> Cementite
Answer: (c).Cementite

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