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MCQs

Total Questions : 149 | Page 9 of 15 pages
Question 81. . During a current change, the ability of a conductor to produce counter emf within itself is called:
  1.    back emf
  2.    self-induction
  3.    a henry
  4.    impedance
 Discuss Question
Answer: Option B. -> self-induction
Question 82. . Electromagnetic induction is the generation of:
  1.    electricity from magnetism
  2.    electricity from electricity
  3.    magnetism from electricity
  4.    magnetism from magnetism
 Discuss Question
Answer: Option A. -> electricity from magnetism
Question 83. . Current will cause a magnetic field in a conductor as follows:
  1.    An ac current causes a fixed polarity magnetic field.
  2.    A dc current causes a fixed polarity magnetic field.
  3.    A dc current causes an alternating magnetic field.
  4.    An ac current causes a fixed polarity magnetic field and a dc current causes an alternating magnetic field.
 Discuss Question
Answer: Option B. -> A dc current causes a fixed polarity magnetic field.
Question 84. . 
A 24 V peak source is connected across a 900 mu.gifH inductor. If the frequency of the source is 22 kHz, what is the reactive power?
  1.    2.3 VAR
  2.    4.6 VAR
  3.    9.3 VAR
  4.    0 VAR
 Discuss Question
Answer: Option A. -> 2.3 VAR
Question 85. . What is the permeability of machine steel?
  1.    1.1 x 10−4
  2.    5.65 x 10−4
  3.    6.9 x 10−3
  4.    8.8 x 10−3
 Discuss Question
Answer: Option B. -> 5.65 x 10−4
Question 86. . When a magnet enters a coil and a voltage is induced, the process is known as:
  1.    an alternation
  2.    self-inductance
  3.    counter emf
  4.    flux linkage
 Discuss Question
Answer: Option D. -> flux linkage
Question 87. . What will happen when an inductor's magnetic field collapses?
  1.    Current will double.
  2.    Voltage will be induced.
  3.    A new field will expand.
  4.    Counter emf will be high.
 Discuss Question
Answer: Option B. -> Voltage will be induced.
Question 88. .  With a square wave input, an RL differentiator circuit with an output across the inductor will produce what type of waveform?
  1.    dc
  2.    short time-duration pulses
  3.    exponential-shaped pulses
  4.    only a phase shift
 Discuss Question
Answer: Option B. -> short time-duration pulses
Question 89. . If 360 Vac is the output of a 300-turn secondary winding, what is the input voltage when the primary winding has 150 turns?
  1.    2.4 Vac
  2.    150 Vac
  3.    180 Vac
  4.    720 Vac
 Discuss Question
Answer: Option C. -> 180 Vac
Question 90. . 
What term is used to describe the action of magnetic flux from one circuit that cuts across the conductors of another circuit?
  1.    self-inductance
  2.    rectification
  3.    mutual inductance
  4.    magnetism
 Discuss Question
Answer: Option C. -> mutual inductance

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