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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 35 of 39 pages
Question 341. Which of the following inductor will have the least eddy current losses?
  1.    Air core
  2.    Powdered iron core
  3.    Iron core
  4.    Laminated iron core
 Discuss Question
Answer: Option A. -> Air core
Question 342. 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.    400 N
  2.    100 N
  3.    300 N
  4.    1000 N
 Discuss Question
Answer: Option B. -> 100 N
Question 343. Both the number of turns and the core length of an inductive coil are doubled. Its self-inductance will be
  1.    Quadrupled
  2.    Doubled
  3.    Unaffected
  4.    Halved
 Discuss Question
Answer: Option B. -> Doubled
Question 344. If current in a conductor increases then according to Lenz's law self-induced voltage will
  1.    Tend to decrease the amount of current
  2.    Produce current opposite to the increasing current
  3.    Aid the increasing current
  4.    Aid the applied voltage
 Discuss Question
Answer: Option B. -> Produce current opposite to the increasing current
Question 345. 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.    25 V
  2.    12 V
  3.    15 V
  4.    10 V
 Discuss Question
Answer: Option A. -> 25 V
Question 346. 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.    30 mH
  2.    48 mH
  3.    36 mH
  4.    38 mH
 Discuss Question
Answer: Option D. -> 38 mH
Question 347. A coil induces 350 mV when the current changes at the rate of 1 A/s. The value of inductance is
  1.    None of the listed here
  2.    250 mH
  3.    350 mH
  4.    3500 mH
 Discuss Question
Answer: Option C. -> 350 mH
Question 348. Current changing from 8 A to 12 A in one second induced 20 volts in a coil. The value of inductance is
  1.    5 H
  2.    15 H
  3.    10 H
  4.    20 H
 Discuss Question
Answer: Option A. -> 5 H
Question 349. 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 voltage to the coil
  2.    The resistance of magnetic path
  3.    Change of number of turns of coil
  4.    Variation in coil current
 Discuss Question
Answer: Option A. -> Variation in voltage to the coil
Question 350. 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.    10 H
  2.    12 H
  3.    9 H
  4.    6 H
 Discuss Question
Answer: Option B. -> 12 H

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