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MCQs

Total Questions : 1535 | Page 3 of 154 pages
Question 21. Maximum percentage of carbon in ferrite is
  1.     0.025%
  2.     0.06%
  3.     0.1%
  4.     0.25%
 Discuss Question
Answer: Option A. ->  0.025%
Explanation :
Question 22. Pick up wrong statement about wrought iron
  1.     It contains carbon of the order of 0 to 0.25%
  2.     It melts at 1535°C
  3.     It is very soft and ductile
  4.     It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
 Discuss Question
Answer: Option D. ->  It is made by adding suitable percentage of carbon to molten iron and subjecting the product to repeated hammering and rolling
Explanation :
Question 23. The defect which takes place due to imperfect packing of atoms during crystallization is known as
  1.     Line defect
  2.     Surface defect
  3.     Point defect
  4.     None of these
 Discuss Question
Answer: Option C. ->  Point defect
Explanation :
Question 24. Which of the following alloys does not have copper as one of the constituents?
  1.     Delta metal
  2.     Monel metal
  3.     Constantan
  4.     Nichrome
 Discuss Question
Answer: Option D. ->  Nichrome
Explanation :
Question 25. Large forgings, crank shafts, axles normally contain carbon up to
  1.     0.05 to 0.20%
  2.     0.20 to 0.45%
  3.     0.45 to 0.55%
  4.     0.55 to 1.0%
 Discuss Question
Answer: Option C. ->  0.45 to 0.55%
Explanation :
Question 26. Manganese is added in low carbon steel to
  1.     Make the steel tougher and harder
  2.     Raise the yield point
  3.     Make the steel ductile and of good bending qualities
  4.     All of the above
 Discuss Question
Answer: Option C. ->  Make the steel ductile and of good bending qualities
Explanation :
Question 27. Bronze is an alloy of
  1.     Copper and zinc
  2.     Copper and tin
  3.     Copper, tin and zinc
  4.     None of these
 Discuss Question
Answer: Option B. ->  Copper and tin
Explanation :
Question 28. An eutectoid steel consists of
  1.     Wholly pearlite
  2.     Wholly austenite
  3.     Pearlite and ferrite
  4.     Pearlite and cementite
 Discuss Question
Answer: Option A. ->  Wholly pearlite
Explanation :
Question 29. The transistor is made of
  1.     Silver
  2.     Gold
  3.     Copper
  4.     Germanium
 Discuss Question
Answer: Option D. ->  Germanium
Explanation :
Question 30. The silicon steel is widely used for
  1.     Connecting rods
  2.     Cutting tools
  3.     Generators and transformers in the form of laminated cores
  4.     Motor car crankshafts
 Discuss Question
Answer: Option C. ->  Generators and transformers in the form of laminated cores
Explanation :

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