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MCQs

Total Questions : 112 | Page 2 of 12 pages
Question 11. A ferrite core has less eddy current loss than an iron core because
  1.    Ferrites have high resistance
  2.    Ferrites are magnetic
  3.    Ferrites have low permeability
  4.    Ferrites have high hysteresis
 Discuss Question
Answer: Option D. -> Ferrites have high hysteresis
Question 12. Conductance is analogous to
  1.    Permeance
  2.    Reluctance
  3.    Flux
  4.    Inductance
 Discuss Question
Answer: Option A. -> Permeance
Question 13. Permanent magnets are normally made of
  1.    Alnico alloys
  2.    Aluminium
  3.    Cast iron
  4.    Wrought iron
 Discuss Question
Answer: Option A. -> Alnico alloys
Question 14. Reciprocal of reluctance is
  1.    Reluctivity
  2.    Permeance
  3.    Permeability
  4.    Susceptibility
 Discuss Question
Answer: Option B. -> Permeance
Question 15. A material for good magnetic memory should have
  1.    Low hysteresis loss
  2.    High permeability
  3.    Low retentivity
  4.    High retentivity
 Discuss Question
Answer: Option D. -> High retentivity
Question 16. When both the inductance and resistance of a coil are doubled the value of
  1.    Time constant remains unchanged
  2.    Initial rate of rise of current is doubled
  3.    Final steady current is doubled
  4.    Time constant is halved
 Discuss Question
Answer: Option A. -> Time constant remains unchanged
Question 17. Silicon steel is used in electrical machines because it has
  1.    Low coercivity
  2.    Low retentivity
  3.    Low hysteresis loss
  4.    High coercivity
 Discuss Question
Answer: Option C. -> Low hysteresis loss
Question 18. If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
  1.    Zero
  2.    Small
  3.    Large
  4.    None of the above
 Discuss Question
Answer: Option C. -> Large
Question 19. An air gap is usually inserted in magnetic circuits to
  1.    Increase m.m.f.
  2.    Increase the flux
  3.    Prevent saturation
  4.    None of the above
 Discuss Question
Answer: Option C. -> Prevent saturation
Question 20. The unit of retentivity is
  1.    Weber
  2.    Weber/sq. m
  3.    Ampere turn/meter
  4.    Ampere turns
 Discuss Question
Answer: Option B. -> Weber/sq. m

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