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MCQs

Total Questions : 137 | Page 9 of 14 pages
Question 81. Nitriding steels are tempered at about ________
  1.    100-200°C
  2.    300-450°C
  3.    600-700°C
  4.    800-950°C
 Discuss Question
Answer: Option C. -> 600-700°C
Answer: (c).600-700°C
Question 82. Flame hardening can only be performed on steels with a minimum of ______ carbon.
  1.    0.4%
  2.    0.8%
  3.    1.2%
  4.    1.8%
 Discuss Question
Answer: Option A. -> 0.4%
Answer: (a).0.4%
Question 83. Which of the following is an application for flame hardening?
  1.    Distortion occurs
  2.    Expensive equipment
  3.    Suitable for larger quantities
  4.    Overheating causes cracks
 Discuss Question
Answer: Option D. -> Overheating causes cracks
Answer: (d).Overheating causes cracks
Question 84. How is the heating of surface done in flame hardening technique?
  1.    Oxy-acetylene torch
  2.    Carburizing flame
  3.    Electrode
  4.    Direct sunlight
 Discuss Question
Answer: Option A. -> Oxy-acetylene torch
Answer: (a).Oxy-acetylene torch
Question 85. Flame hardening technique is suitable for ____________
  1.    Plain carbon steels
  2.    Alloy steels
  3.    Cast irons
  4.    Pig iron
 Discuss Question
Answer: Option A. -> Plain carbon steels
Answer: (a).Plain carbon steels
Question 86. How does induction hardening differ from flame hardening?
  1.    Electric current is used
  2.    Higher quenching time
  3.    Low-temperature operation
  4.    Results In fine grain structure
 Discuss Question
Answer: Option A. -> Electric current is used
Answer: (a).Electric current is used
Question 87. ___________ is a method of obtaining diverse properties by varying thermal histories of various regions.
  1.    Selective Hardening
  2.    Carbonitriding
  3.    Annealing
  4.    Austenizing
 Discuss Question
Answer: Option A. -> Selective Hardening
Answer: (a).Selective Hardening
Question 88. Which of the following is true for induction hardening?
  1.    Requires less time
  2.    Hardness and depth is difficult to control
  3.    Only external surfaces can be hardened
  4.    It gives a scaling effect
 Discuss Question
Answer: Option A. -> Requires less time
Answer: (a).Requires less time
Question 89. What is the frequency used for depths of 2 to 3 mm in induction hardening?
  1.    1200 Hz
  2.    3000 Hz
  3.    5400 Hz
  4.    9600 Hz
 Discuss Question
Answer: Option D. -> 9600 Hz
Answer: (d).9600 Hz
Question 90. What is the hardness achieved by flame hardening?
  1.    HRC 30-40
  2.    HRC 50-60
  3.    HRC 80-100
  4.    HRC 120-140
 Discuss Question
Answer: Option B. -> HRC 50-60
Answer: (b).HRC 50-60

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