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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 3 of 39 pages
Question 21. Which of the following inductor will have the least eddy current losses?
  1.    Air core
  2.    Laminated iron core
  3.    Iron core
  4.    Powdered iron core
 Discuss Question
Answer: Option A. -> Air core
Question 22. Find the force acting on a conductor 3m long carrying a current of 50 amperes at right angles to a magnetic field having a flux density of 0.67 tesla
  1.    100 N
  2.    400 N
  3.    600 N
  4.    1000 N
 Discuss Question
Answer: Option A. -> 100 N
Question 23. The polarity of the induced voltage can be determined by using the left-hand generator rule.
  1.    Yes
  2.    No
 Discuss Question
Answer: Option A. -> Yes
Question 24. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
  1.    Unaffected
  2.    Doubled
  3.    Halved
  4.    Quadrupled
 Discuss Question
Answer: Option B. -> Doubled
Question 25. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be
  1.    10 V
  2.    15 V
  3.    25 V
  4.    50 V
 Discuss Question
Answer: Option C. -> 25 V
Question 26. If current in a conductor increases then according to Lenz's law self-induced voltage will
  1.    Aid the increasing current
  2.    Tend to decrease the amount of current
  3.    Produce current opposite to the increasing current
  4.    Aid the applied voltage
 Discuss Question
Answer: Option C. -> Produce current opposite to the increasing current
Question 27. Two coils have inductances of 8 mH and 18 mH and a coefficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be
  1.    32 mH
  2.    38 mH
  3.    40 mH
  4.    48 mH
 Discuss Question
Answer: Option B. -> 38 mH
Question 28. Two coils have self-inductances of 10 H and 2 H, the mutual inductance being zero. If the two coils are connected in series, the total inductance will be
  1.    6 H
  2.    8 H
  3.    12 H
  4.    24 H
 Discuss Question
Answer: Option C. -> 12 H
Question 29. A coil is wound on iron core which carries current I. The self-induced voltage in the coil is not affected by
  1.    Variation in coil current
  2.    Variation in voltage to the coil
  3.    Change of number of turns of coil
  4.    The resistance of magnetic path
 Discuss Question
Answer: Option B. -> Variation in voltage to the coil
Question 30. Mutually inductance between two magnetically coupled coils depends on
  1.    Permeability of the core
  2.    The number of their turns
  3.    Cross-sectional area of their common core
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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