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MCQs

Total Questions : 166 | Page 16 of 17 pages
Question 151. Which of following material has least value of dielectric constant?
  1.      Oil.
  2.      Ceramics.
  3.      Paper.
  4.      Glass.
 Discuss Question
Answer: Option A. ->   Oil.
Question 152. The core of a transformer for microwave frequency should be made of
  1.      ferrites.
  2.      silicon.
  3.     iron.
  4.      silicon carbide.
 Discuss Question
Answer: Option A. ->   ferrites.
Question 153. Which statement is not true of ferromagnetic materials.
  1.     Energy loss is proportional to the area of hysteresis loop.
  2.      They have fixed value of μr.
  3.     They lose their nonlinearly property above the Curie temperature.
  4.     They have large magnetic susceptibility.
 Discuss Question
Answer: Option B. ->   They have fixed value of μr.
Question 154. Indicate which of following material does not retain magnetism permanently
  1.     stainless steel.
  2.     hardness steel.
  3.     none of above.
  4.     soft iron.
 Discuss Question
Answer: Option D. ->  soft iron.
Question 155. A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is
  1.     rotating.
  2.     pulsating.
  3.     alternating.
  4.     / >(A), (B), and (C) are all correct.
 Discuss Question
Answer: Option D. ->  / >(A), (B), and (C) are all correct.
Question 156. A ferrite core has low eddy current loss than an iron core because
  1.     ferrites are magnetic.
  2.     ferrites have hig hysteresis.
  3.     / >ferrites have high resistance.
  4.     ferrites have low permeability.
 Discuss Question
Answer: Option C. ->  / >ferrites have high resistance.
Question 157. It is difficult to magnetize steel because it has
  1.      low permeability.
  2.     high permittivity.
  3.     high permeability.
  4.     low susceptibility.
 Discuss Question
Answer: Option A. ->   low permeability.
Question 158. In order to minimise loss due to hysteresis, the magnetic material should have
  1.      low hysteresis coefficient.
  2.      high retentivity.
  3.      high resistivity.
  4.      large B-H loop area.
 Discuss Question
Answer: Option A. ->   low hysteresis coefficient.
Question 159. Dielectric constant for vacuum is
  1.      0.
  2.      1.
  3.      infinity.
  4.     100.
 Discuss Question
Answer: Option B. ->   1.
Question 160. In electrical machines the material preferred for pole shoes of electromagnets is
  1.     lead.
  2.     aluminium.
  3.     copper.
  4.     pure iron.
 Discuss Question
Answer: Option D. ->  pure iron.

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