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MCQs

Electromagnetic Induction, Alternating Current And Voltage

Total Questions : 385 | Page 32 of 39 pages
Question 311. Materials subjected to rapid reversals of magnetism should have
  1.     low hysteresis loss.
  2.     low permeability.
  3.     high permeability.
  4.     both a and b.
 Discuss Question
Answer: Option D. ->  both a and b.
Question 312. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as
  1.    Self-inductance
  2.    Mutual inductance
  3.    Series aiding inductance
  4.    Capacitance
 Discuss Question
Answer: Option A. -> Self-inductance
Question 313. Which circuit element(s) will oppose the change in circuit current?
  1.    Resistance only
  2.    Capacitance only
  3.    Inductance only
  4.    Inductance and capacitance
 Discuss Question
Answer: Option C. -> Inductance only
Question 314. In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
  1.    0.5
  2.    2.0
  3.    2.5
  4.    1.0
 Discuss Question
Answer: Option D. -> 1.0
Question 315. Two 300 uH coils in series without mutual coupling have a total inductance of
  1.    600 uH
  2.    900 uH
  3.    1200 uH
  4.    300 uH
 Discuss Question
Answer: Option A. -> 600 uH
Question 316. Which of the following circuit elements will oppose the change in circuit current?
  1.    Resistance
  2.    All of the listed here
  3.    Capacitance
  4.    Inductance
 Discuss Question
Answer: Option D. -> Inductance
Question 317. An open coil has
  1.    Zero resistance and inductance
  2.    Infinite resistance and zero inductance
  3.    Infinite resistance and normal inductance
  4.    Zero resistance and high inductance
 Discuss Question
Answer: Option B. -> Infinite resistance and zero inductance
Question 318. A conductor carries 125 amperes of current under 60° to a magnetic field of 1.1 tesla. The force on the conductor will be nearly
  1.    120 N
  2.    90 N
  3.    30 N
  4.    60 N
 Discuss Question
Answer: Option A. -> 120 N
Question 319. Which of the following is not a unit of inductance?
  1.    All of the listed here
  2.    Coulomb/volt ampere
  3.    Volt second per ampere
  4.    Hennry
 Discuss Question
Answer: Option B. -> Coulomb/volt ampere
Question 320. The self inductances of two coils are 8 mH and 18 mH. If the coefficient of coupling is 0.5, the mutual inductance of the coils is
  1.    36 mH
  2.    18 mH
  3.    6 mH
  4.    12 mH
 Discuss Question
Answer: Option C. -> 6 mH

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