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MCQs

Total Questions : 166 | Page 2 of 17 pages
Question 11. The carbon percentage is least in
  1.    low carbon steel
  2.    wrought iron
  3.    cast iron
  4.    malleable iron
 Discuss Question
Answer: Option B. -> wrought iron
Question 12. Addition of 0.3 to 4.5% silicon to iron __________ the electrical resistivity of iron.
  1.    Increases
  2.    Decreases
  3.    Does not change
  4.    Change
 Discuss Question
Answer: Option A. -> Increases
Question 13. Due to which of the following reasons aluminium does not corrode in atmosphere ?
  1.    Aluminium is a noble metal
  2.    Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
  3.    No reaction with oxygen occurs ft Any of the above
  4.    All of the above
 Discuss Question
Answer: Option B. -> Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
Question 14. In thermocouples which of the following pairs is commonly used ?
  1.    Copper-constantan
  2.    Aluminium-tin
  3.    Silver-German silver
  4.    Iron-steel
 Discuss Question
Answer: Option A. -> Copper-constantan
Question 15. If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as
  1.    non-linear conductor
  2.    reverse conductor
  3.    bad-conductor
  4.    non-conductor
 Discuss Question
Answer: Option A. -> non-linear conductor
Question 16. Surface resistance of an insulating material is reduced due to the
  1.    Smoky and dirty atmosphere
  2.    Humidity in the atmosphere
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A and B
Question 17. Due to which of the following fact, in India, aluminium is replacing copper ?
  1.    Aluminium is more ductile and malleable than copper
  2.    Aluminium is available in plenty, cheaper and lighter than copper
  3.    Aluminium has lower resistivity than that of copper
  4.    Aluminium has less temperature co-efficient than copper
 Discuss Question
Answer: Option B. -> Aluminium is available in plenty, cheaper and lighter than copper
Question 18. Which of the following is an advantage of stranded conductor over equivalent single conductor ?
  1.    Less liability to kink
  2.    Greater flexibility
  3.    Less liability to break
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 19. Steel wire is used as
  1.    Overhead telephone wire
  2.    Earth wire
  3.    Core wire of ACSR
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 20. The conductivity of a metal is determined by
  1.    The electronic concentration and the mobility of the free electrons
  2.    The number of valence electrons per atom
  3.    Either A or B
  4.    None of the above
 Discuss Question
Answer: Option A. -> The electronic concentration and the mobility of the free electrons

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