Magnetism And Electromagnetism(Electrical Engineering ) Questions and Answers

Question 1. Which of the following is a vector quantity?
  1.    Relative permeability
  2.    Magnetic field intensity
  3.    Flux density
  4.    Magnetic potential
Explanation:-
Answer: Option B. -> Magnetic field intensity
Question 2. Magnetism of a magnet can be destroyed by
  1.    heating
  2.    hammering
  3.    by inductive action of another magnet
  4.    by all above methods
Explanation:-
Answer: Option D. -> by all above methods
Question 3. What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?
  1.    2,400 At
  2.    240 At
  3.    24 At
  4.    2.4 At
Explanation:-
Answer: Option C. -> 24 At
Question 4. Strength of an electromagnet can be increased by
  1.    increasing the cross-sectional area
  2.    increasing the number of turns
  3.    increasing current supply
  4.    all above methods
Explanation:-
Answer: Option D. -> all above methods
Question 5. What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?
  1.    18.75 At
  2.    30 At
  3.    300 At
  4.    187 At
Explanation:-
Answer: Option C. -> 300 At
Question 6. The ratio of intensity of magnetisation to the magnetisation force is known as
  1.    flux density
  2.    susceptibility
  3.    relative permeability
  4.    none of the above
Explanation:-
Answer: Option B. -> susceptibility
Question 7. Ferrites are materials.
  1.    paramagnetic
  2.    diamagnetic
  3.    ferromagnetic
  4.    none of the above
Explanation:-
Answer: Option C. -> ferromagnetic
Question 8. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart
  1.    22 x 10-8 N
  2.    22 x 10-7 N
  3.    22 x 10-6 N
  4.    22 x 10-5 N
Explanation:-
Answer: Option D. -> 22 x 10-5 N
Question 9. The uniform magnetic field is
  1.    the field of a set of parallel conductors
  2.    the field of a single conductor
  3.    the field in which all lines of magnetic flux are parallel and equidistant
  4.    none of the above
Explanation:-
Answer: Option C. -> the field in which all lines of magnetic flux are parallel and equidistant
Question 10. The commonly used material for shielding or screening magnetism is
  1.    copper
  2.    aluminium
  3.    soft iron
  4.    brass
Explanation:-
Answer: Option C. -> soft iron
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