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MCQs

Total Questions : 575 | Page 57 of 58 pages
Question 561. . After the magnetizing force has been removed, the ratio of the remaining magnetic flux to the saturated magnetic flux is called _____________.
  1.    saturation
  2.    retentivity
  3.    hysteresis
  4.    coercivity
 Discuss Question
Answer: Option B. -> retentivity
Question 562. . The flux density is ___ when the magnetic flux is 9 µWb and the cross-sectional area of the magnetic field is 5 × 10–3 m2.
  1.    1800 µT
  2.    555.56 T
  3.    9 µT
  4.    5 × 10–3 T
 Discuss Question
Answer: Option A. -> 1800 µT
Question 563. . You can determine the direction of the lines of force surrounding a conductor by using _____.
  1.    the right-hand rule
  2.    the left-hand rule
  3.    Lenz's law
  4.    Faraday's law
 Discuss Question
Answer: Option A. -> the right-hand rule
Question 564. . A group of force lines going from the north pole to the south pole of a magnet is called the magnetic ___.
  1.    retentivity
  2.    reluctance
  3.    hysteresis
  4.    flux
 Discuss Question
Answer: Option D. -> flux
Question 565. . The induced voltage across a stationary conductor in a stationary magnetic field ___.
  1.    equals 0 V
  2.    is usually very large
  3.    varies with time
  4.    depends on the strength of the magnetic field
 Discuss Question
Answer: Option A. -> equals 0 V
Question 566. . When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage will _____.
  1.    not be affected
  2.    equal 0 V
  3.    decrease
  4.    increase
 Discuss Question
Answer: Option D. -> increase
Question 567. . ___ is the ability of a material to remain magnetized after removal of the magnetizing force.
  1.    Reluctance
  2.    Hysteresis
  3.    Retentivity
  4.    Induction
 Discuss Question
Answer: Option C. -> Retentivity
Question 568. . 
Ferromagnetic materials have minute magnetic ___ created within their atomic structure by the orbital motion and spin of electrons.
  1.    forces
  2.    flux lines
  3.    domains
  4.    tapes
 Discuss Question
Answer: Option C. -> domains
Question 569. . The ___ is an electromagnetic device that contains a coil rotating on a jeweled bearing mount.
  1.    permanent-magnet speaker
  2.    d'Arsonval movement
  3.    single-pole, double-throw relay
  4.    crankshaft position sensor
 Discuss Question
Answer: Option B. -> d'Arsonval movement
Question 570. . The induced voltage across a stationary conductor in a stationary magnetic field ___.
  1.    equals 0 V
  2.    is usually very large
  3.    varies with time
  4.    depends on the strength of the magnetic field
 Discuss Question
Answer: Option A. -> equals 0 V

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