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MCQs

Total Questions : 96 | Page 3 of 10 pages
Question 21. Which among the following is an example of a non heat-treatable alloy?
  1.    Al-Cu
  2.    Al-Li
  3.    Al-Mg-Si
  4.    Al-Mn
 Discuss Question
Answer: Option D. -> Al-Mn
Answer: (d).Al-Mn
Question 22. Artificial aging process takes place at a temperature range of ________
  1.    190-260°C
  2.    260-300°C
  3.    300-350°C
  4.    Room temperature
 Discuss Question
Answer: Option A. -> 190-260°C
Answer: (a).190-260°C
Question 23. Which of these is not a stage in precipitation hardening treatment?
  1.    Solution treatment
  2.    Tempering
  3.    Quenching
  4.    Ageing
 Discuss Question
Answer: Option B. -> Tempering
Answer: (b).Tempering
Question 24. What happens when the maximum strength is achieved by the aging process?
  1.    Precipitate hardening
  2.    Age hardening
  3.    Over-aging
  4.    Natural ageing
 Discuss Question
Answer: Option C. -> Over-aging
Answer: (c).Over-aging
Question 25. How much copper is present in Y-alloys?
  1.    4%
  2.    2%
  3.    1.5%
  4.    1%
 Discuss Question
Answer: Option A. -> 4%
Answer: (a).4%
Question 26. What is the melting point of zinc?
  1.    419°C
  2.    600°C
  3.    907°C
  4.    950°C
 Discuss Question
Answer: Option A. -> 419°C
Answer: (a).419°C
Question 27. With the addition of which element, does zinc create resistance to creep?
  1.    Pb
  2.    Cd
  3.    Mg
  4.    Cu
 Discuss Question
Answer: Option C. -> Mg
Answer: (c).Mg
Question 28. What is the temperature at which zinc become malleable?
  1.    <100 °C
  2.    100-150 °C
  3.    >210 °C
  4.    419 °C
 Discuss Question
Answer: Option B. -> 100-150 °C
Answer: (b).100-150 °C
Question 29. The most common casting process for zinc alloys is _______
  1.    Sand casting
  2.    Die casting
  3.    Investment casting
  4.    Centrifugal casting
 Discuss Question
Answer: Option B. -> Die casting
Answer: (b).Die casting
Question 30. What is the appearance of zinc?
  1.    Bluish-grey
  2.    Red
  3.    Yellow
  4.    Green
 Discuss Question
Answer: Option A. -> Bluish-grey
Answer: (a).Bluish-grey

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