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Total Questions : 1535 | Page 4 of 154 pages
Question 31. Connecting rod is usually made of
  1.     Aluminium
  2.     Low carbon steel
  3.     Medium carbon steel
  4.     High carbon steel
 Discuss Question
Answer: Option C. ->  Medium carbon steel
Explanation :
Question 32. Blast furnace is used to produce
  1.     Pig iron
  2.     Cast iron
  3.     Wrought iron
  4.     Steel
 Discuss Question
Answer: Option A. ->  Pig iron
Explanation :
Question 33. The portion of the blast furnace below its widest cross-section is called
  1.     Hearth
  2.     Stack
  3.     Bosh
  4.     Throat
 Discuss Question
Answer: Option C. ->  Bosh
Explanation :
Question 34. Amorphous material is one
  1.     In which atoms align themselves in a geometric pattern upon solidification
  2.     In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
  3.     Which is not attacked by phosphorous
  4.     Which emits fumes on melting
 Discuss Question
Answer: Option B. ->  In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
Explanation :
Question 35. Y-alloy contains
  1.     3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
  2.     3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
  3.     4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
  4.     5 to 6% tin, 2 to 3% copper and rest aluminium
 Discuss Question
Answer: Option B. ->  3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
Explanation :
Question 36. Wrought iron
  1.     Is a ductile material
  2.     Can be easily forged or welded
  3.     Cannot stand sudden and excessive shocks
  4.     All of these
 Discuss Question
Answer: Option D. ->  All of these
Explanation :
Question 37. Hardness of upper bainite (acicular structure) is about
  1.     RC 65
  2.     RC 48
  3.     RC 57
  4.     RC 80
 Discuss Question
Answer: Option B. ->  RC 48
Explanation :
Question 38. Cast iron is manufactured in
  1.     Blast furnace
  2.     Cupola
  3.     Open hearth furnace
  4.     Bessemer converter
 Discuss Question
Answer: Option B. ->  Cupola
Explanation :
Question 39. A reversible change in the atomic structure of steel with corresponding change in the properties is known as
  1.     Molecular change
  2.     Physical change
  3.     Allotropic change
  4.     Solidus change
 Discuss Question
Answer: Option C. ->  Allotropic change
Explanation :
Question 40. Which of the following pipes is least corrosion resistant?
  1.     Brass
  2.     Mild steel
  3.     Cast iron
  4.     Wrought iron
 Discuss Question
Answer: Option D. ->  Wrought iron
Explanation :

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