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MCQs

Total Questions : 96 | Page 5 of 10 pages
Question 41. Tin-base alloys are replaced by aluminum-base alloys due to _______
  1.    High cost
  2.    Low strength
  3.    Corrosion
  4.    Low availability
 Discuss Question
Answer: Option A. -> High cost
Answer: (a).High cost
Question 42. Superalloys have resistance to creep temperatures as high as ______
  1.    100
  2.    250
  3.    500
  4.    1000
 Discuss Question
Answer: Option D. -> 1000
Answer: (d).1000
Question 43. Bearing materials used for low load applications are ______
  1.    Ceramic bearing materials
  2.    Plastic bearing materials
  3.    White bearing materials
  4.    Copper-base bearing materials
 Discuss Question
Answer: Option B. -> Plastic bearing materials
Answer: (b).Plastic bearing materials
Question 44. What is the melting point of magnesium?
  1.    419°C
  2.    650°C
  3.    1091°C
  4.    2562°C
 Discuss Question
Answer: Option B. -> 650°C
Answer: (b).650°C
Question 45. What is the specific gravity of magnesium?
  1.    1.74
  2.    2.7
  3.    6.3
  4.    8.9
 Discuss Question
Answer: Option A. -> 1.74
Answer: (a).1.74
Question 46. Which of the following is not a property of magnesium?
  1.    Low strength
  2.    Vulnerable to corrosion
  3.    Expensive
  4.    Heavyweight
 Discuss Question
Answer: Option D. -> Heavyweight
Answer: (d).Heavyweight
Question 47. Dow metal contains ______ of magnesium.
  1.    0%
  2.    5%
  3.    50%
  4.    90%
 Discuss Question
Answer: Option D. -> 90%
Answer: (d).90%
Question 48. Magnalium is an alloy of magnesium, ________
  1.    Nickel and Tin
  2.    Zinc and Tin
  3.    Nickel and Zinc
  4.    Zirconium and Zinc
 Discuss Question
Answer: Option A. -> Nickel and Tin
Answer: (a).Nickel and Tin
Question 49. Which of the following is a type of aluminum alloy with magnesium?
  1.    Mag-Thor
  2.    Magnox
  3.    Birmabright
  4.    Elektron
 Discuss Question
Answer: Option C. -> Birmabright
Answer: (c).Birmabright
Question 50. How does a high amount of magnesium affect alloys?
  1.    Increases strength
  2.    Increases corrosion resistance
  3.    Lowers density
  4.    Becomes brittle
 Discuss Question
Answer: Option D. -> Becomes brittle
Answer: (d).Becomes brittle

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