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MCQs

Total Questions : 137 | Page 3 of 14 pages
Question 21. The heat released in plasma arc welding is about ____________
  1.    2000-5000°C
  2.    5000-10000°C
  3.    10000-30000°C
  4.    30000-50000°C
 Discuss Question
Answer: Option C. -> 10000-30000°C
Answer: (c).10000-30000°C
Question 22. Which of the following filler metals is used in the electrical industry?
  1.    BAG-1
  2.    BAG-3
  3.    BAG-5
  4.    BAG-6
 Discuss Question
Answer: Option C. -> BAG-5
Answer: (c).BAG-5
Question 23. The liquid temperature of the filler metal used in brazing is _________
  1.    150°C
  2.    427°C
  3.    723°C
  4.    1000°C
 Discuss Question
Answer: Option B. -> 427°C
Answer: (b).427°C
Question 24. Nickel filler metals are heat resistant up to ________ in short time service.
  1.    610°C
  2.    982°C
  3.    1204°C
  4.    1666°C
 Discuss Question
Answer: Option C. -> 1204°C
Answer: (c).1204°C
Question 25. Copper and aluminum can be joined by brazing when _________ alloy is used.
  1.    Copper-zinc
  2.    Aluminum-silicon
  3.    Copper-tellurium
  4.    Aluminum-zinc
 Discuss Question
Answer: Option B. -> Aluminum-silicon
Answer: (b).Aluminum-silicon
Question 26. Removal of internal residual stresses at low temperatures is known as ________
  1.    Recrystallization
  2.    Recovery
  3.    Morphology
  4.    Phase transformation
 Discuss Question
Answer: Option B. -> Recovery
Answer: (b).Recovery
Question 27. How is cooling of the material done is normalising process?
  1.    Furnace
  2.    Cooling tower
  3.    Still air
  4.    Liquid chamber
 Discuss Question
Answer: Option C. -> Still air
Answer: (c).Still air
Question 28. Normalising is best used for is what kind of materials?
  1.    Steel castings
  2.    Steel wires
  3.    High carbon steels
  4.    Low and medium carbon steels
 Discuss Question
Answer: Option D. -> Low and medium carbon steels
Answer: (d).Low and medium carbon steels
Question 29. Which of the following is not applicable for normalising process?
  1.    Economical
  2.    Time-consuming
  3.    Fine grain structure
  4.    Variable properties
 Discuss Question
Answer: Option B. -> Time-consuming
Answer: (b).Time-consuming
Question 30. For normalising, the steel is heated ___________ its upper critical temperature.
  1.    30-40°C above
  2.    30-40°C below
  3.    50-60°C above
  4.    50-60°C below
 Discuss Question
Answer: Option C. -> 50-60°C above
Answer: (c).50-60°C above

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