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Subelement 4

Power Supplies

Section 4-04

regulated power supplies

In a series-regulated power supply, the power dissipation of the pass transistor is:

  • the inverse of the load current and the input/output voltage differential
  • Correct Answer
    directly proportional to the load current and the input/output voltage differential
  • dependent upon the peak inverse voltage appearing across the Zener diode
  • indirectly proportional to the load voltage and the input/output voltage differential
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In any regulated power supply, the output is cleanest and the regulation is best:

  • Correct Answer
    at the point where the sampling network or error amplifier is connected
  • across the secondary of the pass transistor
  • across the load
  • at the output of the pass transistor
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When discussing a power supply the ________ resistance is equal to the output voltage divided by the total current drawn, including the current drawn by the bleeder resistor:

  • Correct Answer
    load
  • ideal
  • rectifier
  • differential
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The regulation of long-term changes in the load resistance of a power supply is called:

  • active regulation
  • analog regulation
  • Correct Answer
    static regulation
  • dynamic regulation
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The regulation of short-term changes in the load resistance of a power supply is called:

  • Correct Answer
    dynamic regulation
  • static regulation
  • analog regulation
  • active regulation
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The dynamic regulation of a power supply is improved by increasing the value of :

  • the choke
  • the input capacitor
  • Correct Answer
    the output capacitor
  • the bleeder resistor
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The output capacitor, in a power supply filter used to provide power for an SSB or CW transmitter, will give better dynamic regulation if:

  • the negative terminal of the electrolytic is connected to the positive and the positive terminal to ground
  • a battery is placed in series with the output capacitor
  • it is placed in series with other capacitors
  • Correct Answer
    the output capacitance is increased
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In a regulated power supply, four diodes connected together in a Bridge act as:

  • equalization across the transformer
  • matching between the secondary of the
  • Correct Answer
    power transformer and the filter a rectifier
  • a tuning network
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In a regulated power supply, components that conduct alternating current at the input before the transformer and direct current before the output are:

  • capacitors
  • diodes
  • Correct Answer
    fuses
  • chokes
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In a regulated power supply, the output of the electrolytic filter capacitor is connected to the:

  • Correct Answer
    voltage regulator
  • pi filter
  • solid-state by-pass circuit
  • matching circuit for the load
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In a regulated power supply, a diode connected across the input and output terminals of a regulator is used to:

  • provide an RF by-pass for the voltage control
  • provide additional capacity
  • protect the regulator from voltage fluctuations in the primary of the transformer
  • Correct Answer
    protect the regulator
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