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MCQs

Total Questions : 575 | Page 3 of 58 pages
Question 21. The attraction capacity of electromagnet will increase if the
  1.    core length increases i
  2.    core area increases
  3.    flux density decreases
  4.    flux density increases
 Discuss Question
Answer: Option D. -> flux density increases
Question 22. Which of the following is expected to have the maximum permeability ?
  1.    Brass
  2.    Copper
  3.    Zinc
  4.    Ebonite
 Discuss Question
Answer: Option D. -> Ebonite
Question 23. Which of the following is a vector quantity?
  1.    Relative permeability
  2.    Magnetic field intensity
  3.    Flux density
  4.    Magnetic potential
 Discuss Question
Answer: Option B. -> Magnetic field intensity
Question 24. 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
 Discuss Question
Answer: Option C. -> 24 At
Question 25. Magnetism of a magnet can be destroyed by
  1.    heating
  2.    hammering
  3.    by inductive action of another magnet
  4.    by all above methods
 Discuss Question
Answer: Option D. -> by all above methods
Question 26. 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
 Discuss Question
Answer: Option C. -> 300 At
Question 27. 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
 Discuss Question
Answer: Option D. -> all above methods
Question 28. A magnetic field exists around
  1.    iron
  2.    copper
  3.    aluminium
  4.    moving charges
 Discuss Question
Answer: Option D. -> moving charges
Question 29. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?
  1.    2 AT
  2.    4 AT
  3.    6 AT
  4.    10 AT
 Discuss Question
Answer: Option B. -> 4 AT
Question 30. Temporary magnets are used in
  1.    loud-speakers
  2.    generators
  3.    motors
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above

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