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MCQs

Total Questions : 575 | Page 7 of 58 pages
Question 61. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?
  1.    2
  2.    4
  3.    6
  4.    8
 Discuss Question
Answer: Option B. -> 4
Question 62. Which of the following type of materials are not very important for engineering applications?
  1.    Ferromagnetic
  2.    Paramagnetic
  3.    Diamagnetic
  4.    None of the above
 Discuss Question
Answer: Option C. -> Diamagnetic
Question 63. The magnetic materials exhibit the property of magnetisation because of
  1.    orbital motion of electrons
  2.    spin of electrons
  3.    spin of nucleus
  4.    either of these
 Discuss Question
Answer: Option C. -> spin of nucleus
Question 64. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
  1.    M
  2.    M/2
  3.    2 M
  4.    M/4
 Discuss Question
Answer: Option B. -> M/2
Question 65. Main causes of noisy solenoid are
  1.    strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force
  2.    uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts
  3.    both of above
  4.    none of the above
 Discuss Question
Answer: Option C. -> both of above
Question 66. The most effective and quickest may of making a magnet from soft iron is by
  1.    placing it inside a coil carrying current
  2.    induction
  3.    the use of permanent magnet
  4.    rubbing with another magnet
 Discuss Question
Answer: Option A. -> placing it inside a coil carrying current
Question 67. Gilbert is a unit of
  1.    electromotive force
  2.    magnetomotive force
  3.    conductance
  4.    permittivity
 Discuss Question
Answer: Option B. -> magnetomotive force
Question 68. Which of the following is the unit of magnetic flux density?
  1.    Weber
  2.    Lumens
  3.    Tesla
  4.    None of the above
 Discuss Question
Answer: Option C. -> Tesla
Question 69. Indicate which of the following material does not retain magnetism permanently.
  1.    Soft iron
  2.    Stainless steel
  3.    Hardened steel
  4.    None of the above
 Discuss Question
Answer: Option A. -> Soft iron
Question 70. The relative permeability is less than unity is case of
  1.    ferromagnetic materials
  2.    ferrites
  3.    non-ferrous materials
  4.    diamagnetic materials
 Discuss Question
Answer: Option D. -> diamagnetic materials

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