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Subel. ZLB
20 questions
Subelement ZLB
Basic Electrical Theory
Section ZLB09
Capacitors, Inductors, Resonance
The total capacitance of two or more capacitors in series is
  • Correct Answer
    always less than that of the smallest capacitor
  • always greater than that of the largest capacitor
  • found by adding each of the capacitances together
  • found by adding the capacitances together and dividing by their total number
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Filter capacitors in power supplies are sometimes connected in series to
  • Correct Answer
    withstand a greater voltage than a single capacitor can withstand
  • increase the total capacity
  • reduce the ripple voltage further
  • resonate the filter circuit
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A component is identified as a capacitor if its value is measured in
  • microvolts
  • millihenrys
  • megohms
  • Correct Answer
    microfarads
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Two metal plates separated by air form a 0.001 uF capacitor. Its value may be changed to 0.002 uF by
  • Correct Answer
    bringing the metal plates closer together
  • making the plates smaller in size
  • moving the plates apart
  • touching the two plates together
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The material separating the plates of a capacitor is the
  • Correct Answer
    dielectric
  • semiconductor
  • resistor
  • lamination
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Three 15 picofarad capacitors are wired in parallel. The value of the combination is
  • Correct Answer
    45 picofarad
  • 18 picofarad
  • 12 picofarad
  • 5 picofarad
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Capacitors and inductors oppose an alternating current. This is known as
  • resistance
  • resonance
  • conductance
  • Correct Answer
    reactance
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The reactance of a capacitor increases as the
  • frequency increases
  • Correct Answer
    frequency decreases
  • applied voltage increases
  • applied voltage decreases
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The reactance of an inductor increases as the
  • Correct Answer
    frequency increases
  • frequency decreases
  • applied voltage increases
  • applied voltage decreases
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Increasing the number of turns on an inductor will make its inductance
  • decrease
  • Correct Answer
    increase
  • remain unchanged
  • become resistive
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The unit of inductance is the
  • farad
  • Correct Answer
    henry
  • ohm
  • reactance
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Two 20 uH inductances are connected in series. The total inductance is
  • 10 uH
  • 20 uH
  • Correct Answer
    40 uH
  • 80 uH
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Two 20 uH inductances are connected in parallel. The total inductance is
  • Correct Answer
    10 uH
  • 20 uH
  • 40 uH
  • 80 uH
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A toroidal inductor is one in which the
  • Correct Answer
    windings are wound on a closed ring of magnetic material
  • windings are air-spaced
  • windings are wound on a ferrite rod
  • inductor is enclosed in a magnetic shield
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A transformer with 100 turns on the primary winding and 10 turns on the secondary winding is connected to 230 volt AC mains. The voltage across the secondary is
  • 10 volt
  • Correct Answer
    23 volt
  • 110 volt
  • 2300 volt
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An inductor and a capacitor are connected in series. At the resonant frequency the resulting impedance is
  • maximum
  • Correct Answer
    minimum
  • totally reactive
  • totally inductive
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An inductor and a capacitor are connected in parallel. At the resonant frequency the resulting impedance is
  • Correct Answer
    maximum
  • minimum
  • totally reactive
  • totally inductive
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An inductor and a capacitor form a resonant circuit. The capacitor value is increased by four times. The resonant frequency will
  • increase by four times
  • double
  • Correct Answer
    decrease to half
  • decrease to one quarter
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An inductor and a capacitor form a resonant circuit. If the value of the inductor is decreased by a factor of four, the resonant frequency will
  • increase by a factor of four
  • Correct Answer
    increase by a factor of two
  • decrease by a factor of two
  • decrease by a factor of four
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A "high Q" resonant circuit is one which
  • carries a high quiescent current
  • Correct Answer
    is highly selective
  • has a wide bandwidth
  • uses a high value inductance
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Go to ZLB08 Go to ZLB10
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