Electromagnetic Induction(Electrical Engineering ) Questions and Answers

Question 1. 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
Explanation:-
Answer: Option A. -> Self-inductance
Question 2. Which of the following circuit elements will oppose the change in circuit current?
  1.    Capacitance
  2.    Inductance
  3.    Resistance
  4.    All of the above
Explanation:-
Answer: Option B. -> Inductance
Question 3. Which circuit element(s) will oppose the change in circuit current?
  1.    Resistance only
  2.    Inductance only
  3.    Capacitance only
  4.    Inductance and capacitance
Explanation:-
Answer: Option B. -> Inductance only
Question 4. In case all the flux from the current in coil 1 links with coil 2, the coefficient of coupling will be
  1.    2.0
  2.    1.0
  3.    0.5
  4.    Zero
Explanation:-
Answer: Option B. -> 1.0
Question 5. Two 300 uH coils in series without mutual coupling have a total inductance of
  1.    300 uH
  2.    600 uH
  3.    150 uH
  4.    75 uH
Explanation:-
Answer: Option B. -> 600 uH
Question 6. 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.    50 N
  2.    120 N
  3.    240 N
  4.    480 N
Explanation:-
Answer: Option B. -> 120 N
Question 7. Lenz's law is a consequence of the law of conservation of
  1.    Induced current
  2.    Charge
  3.    Energy
  4.    Induced e.m.f.
Explanation:-
Answer: Option C. -> Energy
Question 8. A crack in the magnetic path of an inductor will result in
  1.    Unchanged inductance
  2.    Increased inductance
  3.    Zero inductance
  4.    Reduced inductance
Explanation:-
Answer: Option D. -> Reduced inductance
Question 9. Which of the following is not a unit of inductance?
  1.    Henry
  2.    Coulomb/volt ampere
  3.    Volt second per ampere
  4.    All of the above
Explanation:-
Answer: Option B. -> Coulomb/volt ampere
Question 10. 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
Explanation:-
Answer: Option B. -> Infinite resistance and zero inductance
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