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MCQs

Total Questions : 149 | Page 7 of 15 pages
Question 61.  What type of device consists of a coil with a moveable iron core?
  1.    solenoid
  2.    reed switch
  3.    relay
  4.    armature
 Discuss Question
Answer: Option A. -> solenoid
Question 62.  What is magnetic flux?
  1.    the number of lines of force in webers
  2.    the number of lines of force in maxwells
  3.    the number of lines of force in teslas
  4.    the number of lines of force in flux density
 Discuss Question
Answer: Option A. -> the number of lines of force in webers
Question 63.  As current travels within a conductor:
  1.    the magnetic field aids the current
  2.    a magnetic field is developed around it
  3.    the wire tries to point north
  4.    an electrostatic field opposes the current
 Discuss Question
Answer: Option B. -> a magnetic field is developed around it
Question 64.  A series RL filter circuit with an output across the inductor will result in what type of filtering?
  1.    passing of the higher frequencies
  2.    passing of the lower frequencies
  3.    blocking of the higher frequencies
  4.    blocking of a certain range of frequencies
 Discuss Question
Answer: Option A. -> passing of the higher frequencies
Question 65. . What does Faraday's law concern?
  1.    a magnetic field in a coil
  2.    a magnetic field cutting a conductor
  3.    a magnetic field hystersis
  4.    a magnetic field in a conductor
 Discuss Question
Answer: Option B. -> a magnetic field cutting a conductor
Question 66.  On a schematic, dashed lines between two vertical coils usually mean the transformer has:
  1.    an air core
  2.    an iron core
  3.    a nonmetallic core
  4.    a ferrite core
 Discuss Question
Answer: Option D. -> a ferrite core
Question 67. . A henry value divided by a circuit resistive value provides the:
  1.    counter emf value
  2.    induced voltage amplitude
  3.    rise or decay time constant
  4.    quality factor of the coil
 Discuss Question
Answer: Option B. -> induced voltage amplitude
Question 68. . Faraday's law states that the:
  1.    direction of the induced voltage produces an opposition
  2.    direction of an induced current produces an aiding effect
  3.    emf depends on the rate of cutting flux
  4.    emf is related to the direction of the current
 Discuss Question
Answer: Option C. -> emf depends on the rate of cutting flux
Question 69. . What is the permeability of transformer iron?
  1.    50
  2.    450
  3.    1,500
  4.    5,500
 Discuss Question
Answer: Option D. -> 5,500
Question 70. . The polarity of induced voltage while a field is collapsing is:
  1.    independent of the force creating it
  2.    opposite to the force creating it
  3.    identical to the force creating the field
  4.    present only if the force is stationary
 Discuss Question
Answer: Option B. -> opposite to the force creating it

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