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MCQs

Total Questions : 96 | Page 6 of 10 pages
Question 51. A magnesium alloy containing 3% rare earth metal exhibits which of the following characteristics?
  1.    Creep resistance up to 250°C
  2.    Good founding properties
  3.    Die-casting alloy
  4.    Good overall properties
 Discuss Question
Answer: Option A. -> Creep resistance up to 250°C
Answer: (a).Creep resistance up to 250°C
Question 52. What is the appearance of lead?
  1.    Bluish-grey
  2.    Metallic-grey
  3.    Red-orange
  4.    Yellow
 Discuss Question
Answer: Option B. -> Metallic-grey
Answer: (b).Metallic-grey
Question 53. Which element is known as the softest heavy metal?
  1.    Copper
  2.    Lead
  3.    Iron
  4.    Nickel
 Discuss Question
Answer: Option B. -> Lead
Answer: (b).Lead
Question 54. Which of the following alloys is used in nuclear reactors?
  1.    Elektron
  2.    Magnox
  3.    Mag-Thor
  4.    Pyrotechnics
 Discuss Question
Answer: Option B. -> Magnox
Answer: (b).Magnox
Question 55. What is the melting point of lead?
  1.    327°C
  2.    419°C
  3.    1091°C
  4.    1749°C
 Discuss Question
Answer: Option A. -> 327°C
Answer: (a).327°C
Question 56. Lead alloys containing _______ lead are used as bearing metals.
  1.    2-3%
  2.    8-10%
  3.    14-16%
  4.    17-20%
 Discuss Question
Answer: Option B. -> 8-10%
Answer: (b).8-10%
Question 57. What is a nickel-iron alloy, with 40-50% nickel, called?
  1.    Invar
  2.    Elinvar
  3.    Constantan
  4.    Monel
 Discuss Question
Answer: Option A. -> Invar
Answer: (a).Invar
Question 58. Addition of which element turns the Invar alloy into Elinvar alloy?
  1.    Copper
  2.    Tin
  3.    Chromium
  4.    Manganese
 Discuss Question
Answer: Option C. -> Chromium
Answer: (c).Chromium
Question 59. The melting point of nickel is _________
  1.    327°C
  2.    650°C
  3.    1453°C
  4.    2730°C
 Discuss Question
Answer: Option C. -> 1453°C
Answer: (c).1453°C
Question 60. Bearing metals are called Babbit metals on the addition of ________
  1.    Tin
  2.    Arsenic
  3.    Nickel
  4.    Antimony
 Discuss Question
Answer: Option D. -> Antimony
Answer: (d).Antimony

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