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MCQs

Total Questions : 149 | Page 8 of 15 pages
Question 71. . Electromagnetism is the:
  1.    magnetic field caused by a permanent magnet
  2.    action between a permanent and an artificial magnet
  3.    magnetic field action with a current-carrying wire
  4.    current in the coil
 Discuss Question
Answer: Option C. -> magnetic field action with a current-carrying wire
Question 72. . The four factors determining inductance are the number of turns, coil length, coil area, and:
  1.    permeability
  2.    reluctance
  3.    counter emf
  4.    coefficient of coupling
 Discuss Question
Answer: Option A. -> permeability
Question 73. . A magnetic field has:
  1.    polar fields
  2.    lines of force
  3.    magnetomotive force
  4.    lines of reluctance
 Discuss Question
Answer: Option B. -> lines of force
Question 74. . Which two values are plotted on a B-H curve graph?
  1.    reluctance and flux density
  2.    permeability and reluctance
  3.    magnetizing force and permeability
  4.    flux density and magnetizing force
 Discuss Question
Answer: Option D. -> flux density and magnetizing force
Question 75. . What is the number of turns required in the secondary winding for a transformer when 120 volts is applied to a 2400-turn primary to produce 7.5 Vac at the secondary?
  1.    75 turns
  2.    150 turns
  3.    900 turns
  4.    1920 turns
 Discuss Question
Answer: Option B. -> 150 turns
Question 76. . The time difference, or lag, between flux density and magnetizing force is known as:
  1.    eddy current
  2.    magnetic saturation
  3.    hysteresis
  4.    coercivity
 Discuss Question
Answer: Option C. -> hysteresis
Question 77. . What is the inductive reactance if the Q of a coil is 60, and the winding resistance is 5 omega.gif?
  1.    0.083 omega.gif
  2.    12 omega.gif
  3.    30 omega.gif
  4.    300 omega.gif
 Discuss Question
Answer: Option D. -> 300 omega.gif
Question 78. . A magnetic circuit breaker will open to protect equipment only when:
  1.    voltage is exceeded
  2.    an open is in the equipment
  3.    the equipment is operating properly
  4.    current is exceeded
 Discuss Question
Answer: Option D. -> current is exceeded
Question 79. . When a transformer secondary lead has been connected to a middle loop that is not an end connector, it is called a:
  1.    multiple-tapped secondary
  2.    center-tapped secondary
  3.    multiple winding secondary
  4.    single winding secondary
 Discuss Question
Answer: Option B. -> center-tapped secondary
Question 80. . Inductance is:
  1.    directly proportional to the length of the coil
  2.    directly proportional to the number of turns on the coil
  3.    inversely proportional to the cross-sectional area of the coil
  4.    inversely proportional to the permeability
 Discuss Question
Answer: Option B. -> directly proportional to the number of turns on the coil

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