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Total Questions : 1535 | Page 7 of 154 pages
Question 61. Mild steel belongs to the following category
  1.     Low carbon steel
  2.     Medium carbon steel
  3.     High carbon steel
  4.     Alloy steel
 Discuss Question
Answer: Option A. ->  Low carbon steel
Explanation :
Question 62. Cupola produces following material
  1.     Cast iron
  2.     Pig iron
  3.     Wrought iron
  4.     Malleable iron
 Discuss Question
Answer: Option A. ->  Cast iron
Explanation :
Question 63. For the allotropic forms of iron, the points of arrest are
  1.     The points where no further change occurs
  2.     Constant for all metals
  3.     The points where there is no further flow of metal
  4.     The points of discontinuity
 Discuss Question
Answer: Option D. ->  The points of discontinuity
Explanation :
Question 64. Hematite iron ore contains iron about
  1.     30%
  2.     45%
  3.     55%
  4.     70%
 Discuss Question
Answer: Option D. ->  70%
Explanation :
Question 65. In malleable iron, carbon is present in the form of
  1.     Cementite
  2.     Free carbon
  3.     Flakes
  4.     Nodular aggregates of graphite
 Discuss Question
Answer: Option D. ->  Nodular aggregates of graphite
Explanation :
Question 66. Which of the following is not the correct method of increasing fatigue limit?
  1.     Shot peening
  2.     Nitriding of surface
  3.     Cold working
  4.     Surface decarburisation
 Discuss Question
Answer: Option D. ->  Surface decarburisation
Explanation :
Question 67. Induction hardening is basically a
  1.     Carburising process
  2.     Surface hardening process
  3.     Core hardening process
  4.     None of these
 Discuss Question
Answer: Option B. ->  Surface hardening process
Explanation :
Question 68. The brown smoke during the operation of a bessemer converter indicates that the
  1.     Air is burning out silicon and manganese
  2.     Silicon and manganese has burnt and carbon has started oxidizing
  3.     The converter must be titled to remove the contents of the converter
  4.     The brown smoke does not occur during the operation of a Bessemer converter
 Discuss Question
Answer: Option A. ->  Air is burning out silicon and manganese
Explanation :
Question 69. Iron ore is usually found in the form of
  1.     Oxides
  2.     Carbonates
  3.     Sulphides
  4.     All of these
 Discuss Question
Answer: Option D. ->  All of these
Explanation :
Question 70. Drop forging dies contain carbon of the order of
  1.     0.1 to 0.2%
  2.     0.25 to 0.5%
  3.     0.6 to 0.7%
  4.     0.7 to 0.9%
 Discuss Question
Answer: Option C. ->  0.6 to 0.7%
Explanation :

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