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MCQs

Total Questions : 137 | Page 5 of 14 pages
Question 41. The slip does not occur in martensite due to the presence of _______ in the lattice.
  1.    Silicon
  2.    Germanium
  3.    Carbon
  4.    Tin
 Discuss Question
Answer: Option C. -> Carbon
Answer: (c).Carbon
Question 42. How does the size of the specimen affect the hardness of steel?
  1.    Smaller size results are high hardness
  2.    Smaller size results in low hardness
  3.    Larger size results in high hardness
  4.    No change is found
 Discuss Question
Answer: Option A. -> Smaller size results are high hardness
Answer: (a).Smaller size results are high hardness
Question 43. ___________ is defined as the ease of forming martensite.
  1.    Hardness
  2.    Hardenability
  3.    Toughness
  4.    Strength
 Discuss Question
Answer: Option B. -> Hardenability
Answer: (b).Hardenability
Question 44. The hardening process is carried out on ________ steel.
  1.    No carbon
  2.    Low carbon
  3.    Medium carbon
  4.    High carbon
 Discuss Question
Answer: Option D. -> High carbon
Answer: (d).High carbon
Question 45. How does the rate of cooling affect the hardness of steel?
  1.    Faster cooling results in low hardness
  2.    Slow cooling results in high hardness
  3.    Fast cooling results in high hardness
  4.    No change is found
 Discuss Question
Answer: Option C. -> Fast cooling results in high hardness
Answer: (c).Fast cooling results in high hardness
Question 46. Hardenability of a material can be measured using __________ test.
  1.    Jominy end-quench
  2.    Charpy
  3.    Rockwell
  4.    Izod
 Discuss Question
Answer: Option A. -> Jominy end-quench
Answer: (a).Jominy end-quench
Question 47. Which of the following factors affect the hardenability of a material?
  1.    Composition of steel
  2.    Grain size
  3.    Temperature of specimen
  4.    Quenching medium
 Discuss Question
Answer: Option C. -> Temperature of specimen
Answer: (c).Temperature of specimen
Question 48. Quenching of the sample in Jominy end-quench method is done at _______
  1.    0°C
  2.    25°C
  3.    125°C
  4.    200°C
 Discuss Question
Answer: Option B. -> 25°C
Answer: (b).25°C
Question 49. Which of the following is not a result of tempering?
  1.    Increased ductility
  2.    Improved toughness
  3.    Increased electrical conductivity
  4.    Internal stresses are relieved
 Discuss Question
Answer: Option C. -> Increased electrical conductivity
Answer: (c).Increased electrical conductivity
Question 50. Hardness readings are taken every ________ after quenching in Jominy end-quench test.
  1.    0.01 mm
  2.    0.1 mm
  3.    1.6 mm
  4.    2.5 mm
 Discuss Question
Answer: Option C. -> 1.6 mm
Answer: (c).1.6 mm

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