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Total Questions : 1535 | Page 148 of 154 pages
Question 1471. 5. Austenite can exist even at sub zero temperature by having high percentage of
  1.    Chromium
  2.    Manganese
  3.    Magnesium
  4.    Cobalt
 Discuss Question
Answer: Option A. -> Chromium
Question 1472. 9. The main purpose of heat treatment of steels is to change the
  1.    Chemical composition
  2.    Mechanical properties
  3.    Corrosion properties
  4.    Surface finish
 Discuss Question
Answer: Option B. -> Mechanical properties
Question 1473. 7. Which of the following has maximum hardness
  1.    Austenite
  2.    Pearlite
  3.    Troostite
  4.    Martensite
 Discuss Question
Answer: Option D. -> Martensite
Question 1474. 8. Which of the following is not the objective of normalising
  1.    Refine steel structure
  2.    Remove strains caused by cold working of metal
  3.    Remove internal stresses
  4.    Improve tensile strength
 Discuss Question
Answer: Option C. -> Remove internal stresses
Question 1475. 6. Beryllium is used chiefly as an alloy addition to copper to produce
  1.    Precipitation-hardenable alloy
  2.    Corrosion resistant alloy
  3.    High-strength alloy
  4.    Non-magnetic and non-sparking alloy
 Discuss Question
Answer: Option D. -> Non-magnetic and non-sparking alloy
Question 1476. 0. Low carbon steel can be hardened by
  1.    Hardening
  2.    Heating and quenching in oil
  3.    Heating and quenching in water
  4.    Carburising and cyaniding
 Discuss Question
Answer: Option D. -> Carburising and cyaniding
Question 1477. 1. The hardening strains are reduced and the toughness of the part increased by the following process after hardening
  1.    Annealing
  2.    Carburizing
  3.    Tempering
  4.    Anodizing
 Discuss Question
Answer: Option C. -> Tempering
Question 1478. 2. Hard alloy and tool steels are made easy machinable by following heat treatment
  1.    Case carburising
  2.    Tempering
  3.    Annealing
  4.    Normalising
 Discuss Question
Answer: Option C. -> Annealing
Question 1479. 3. Case hardening is the only method suitable for hardening:
  1.    High alloy steel
  2.    High carbon steel
  3.    Low-carbon steel
  4.    High speed steel
 Discuss Question
Answer: Option C. -> Low-carbon steel
Question 1480. 5. High alloy steels have to be heated slowly and uniformly for hardening, to avoid
  1.    Scaling
  2.    Shrinkage
  3.    Warpage
  4.    Segregation
 Discuss Question
Answer: Option C. -> Warpage

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