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MCQs

Total Questions : 1977 | Page 6 of 198 pages
Question 51. In order to be called steel, an alloy should have iron percentage greater than
  1.    80
  2.    70
  3.    90
  4.    50
 Discuss Question
Answer: Option A. -> 80
Question 52. Carbon percentage is the same in cast iron and
  1.    Wrought iron
  2.    Pig iron
  3.    Mild steel
  4.    High silicon (14%) iron
 Discuss Question
Answer: Option B. -> Pig iron
Question 53. Which one contains the least percentage of carbon?
  1.    Wrought iron
  2.    High speed steel
  3.    Cast iron
  4.    Pig iron
 Discuss Question
Answer: Option A. -> Wrought iron
Question 54. Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
  1.    Beryllium
  2.    Manganese
  3.    Copper
  4.    Iron
 Discuss Question
Answer: Option B. -> Manganese
Question 55. The purpose of nitriding the steel is to
  1.    Harden its surface
  2.    Soften its surface
  3.    Improve its reliability
  4.    None of these
 Discuss Question
Answer: Option A. -> Harden its surface
Question 56. Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
  1.    Rubber lined mild steel
  2.    Lead lined mild steel
  3.    Aluminium
  4.    Cast iron
 Discuss Question
Answer: Option A. -> Rubber lined mild steel
Question 57. Pick out the wrong statement
  1.    Hardening makes the steel more brittle
  2.    High alloy steels contain more than 50% alloying element
  3.    18/8 stainless steel is a magnetic steel
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 58. Which one occupies the lowermost position in the electromotive series of metals?
  1.    Aluminium
  2.    Noble metals (Ag, Pt, Au)
  3.    Zinc
  4.    Alkali metals (K, Na, Li)
 Discuss Question
Answer: Option B. -> Noble metals (Ag, Pt, Au)
Question 59. A material capable of undergoing large permanent deformation, when subjected to tension is termed as
  1.    Friable
  2.    Ductile
  3.    Brittle
  4.    None of these
 Discuss Question
Answer: Option B. -> Ductile
Question 60. Carbon is present in the uncombined (graphitic) form in case of
  1.    Cast iron
  2.    Steel
  3.    Ferroalloy
  4.    None of these
 Discuss Question
Answer: Option A. -> Cast iron

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