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MCQs

Total Questions : 149 | Page 13 of 15 pages
Question 121. . Which transformer turns ratio is needed to match two 16-ohm parallel devices to an output of 22.2 ohms?
  1.    1.38:1
  2.    1.67:1
  3.    0.72:1
  4.    0.60:1
 Discuss Question
Answer: Option D. -> 0.60:1
Question 122. . A transformer will have:
  1.    primary and secondary windings
  2.    primary and secondary current
  3.    primary wattage producing secondary current
  4.    different frequencies for the primary and
 Discuss Question
Answer: Option A. -> primary and secondary windings
Question 123. . A loaded transformer will achieve mutual induction when:
  1.    secondary current increase causes a primary current decrease
  2.    primary current is increased by an increase in secondary current
  3.    primary current is decreased by an increase in secondary current
  4.    secondary current decrease causes a primary current increase
 Discuss Question
Answer: Option B. -> primary current is increased by an increase in secondary current
Question 124. . What happens when moving expanding lines of force encounter a conductor?
  1.    Current increases.
  2.    Voltage is induced.
  3.    Resistance is reduced.
  4.    Power is increased.
 Discuss Question
Answer: Option B. -> Voltage is induced.
Question 125. . What is the phase angle of a 24 Vac parallel RL circuit when R = 45 ohms and XL = 1100 ohms?
  1.    0.001 degrees
  2.    2.300 degrees
  3.    87.600 degrees
  4.    89.900 degrees
 Discuss Question
Answer: Option B. -> 2.300 degrees
Question 126. . A winding of wire can be called
  1.    an inductor
  2.    a coil
  3.    a choke
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 127. . Fixed transformers have:
  1.    a center-tapped secondary
  2.    multiple windings
  3.    turns ratios that cannot be changed
  4.    a multiple-tapped secondary
 Discuss Question
Answer: Option C. -> turns ratios that cannot be changed
Question 128. . What is electromagnetism?
  1.    the magnetic field generated around a conductor when a current passes through it
  2.    the magnetic field generated in a conductor by an external voltage
  3.    the voltage caused by a magnetic field in a conductor
  4.    the current generated by an external magnetic field
 Discuss Question
Answer: Option A. -> the magnetic field generated around a conductor when a current passes through it
Question 129. . What is the maximum source current for a transformer rated at 10 kVA, 1000/500 60 Hz?
  1.    2 A
  2.    5 A
  3.    10 A
  4.    20 A
 Discuss Question
Answer: Option D. -> 20 A
Question 130. . Which of the following represents a true equivalent of an inductor?
  1.    An inductance in series with a resistance and a capacitance
  2.    A capacitance in parallel with the series combination of a resistance and an inductance
  3.    An inductance in parallel with the series combination of a resistance and a capacitance
  4.    The only quality a real inductor has is inductance.
 Discuss Question
Answer: Option B. -> A capacitance in parallel with the series combination of a resistance and an inductance

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