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Subelement 4

Power Supplies

Section 4-03

linear and switching voltage regulator circuits

What is one characteristic of a linear electronic voltage regulator?

  • Correct Answer
    The conduction of a control element is varied in direct proportion to the line voltage or load current
  • It has a ramp voltage at its output
  • A pass transistor switches from its "on" state to its "off" state
  • The control device is switched on or off, with the duty cycle proportional to the line or load conditions
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What is one characteristic of a switching voltage regulator?

  • Correct Answer
    The control device is switched on and off, with the duty cycle proportional to the line or load conditions
  • The conduction of a control element is varied in direct proportion to the line voltage or load current
  • It provides more than one output voltage
  • It gives a ramp voltage at its output
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What device is typically used as a stable reference voltage in a linear voltage regulator?

  • An SCR
  • A varactor diode
  • A junction diode
  • Correct Answer
    A zener diode
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What type of linear regulator is used in applications requiring efficient utilization of the primary power source?

  • A shunt regulator
  • A constant current source
  • A shunt current source
  • Correct Answer
    A series regulator
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What type of linear voltage regulator is used in applications requiring a constant load on the unregulated voltage source?

  • A constant current source
  • A shunt current source
  • Correct Answer
    A shunt regulator
  • A series regulator
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How is remote sensing accomplished in a linear voltage regulator?

  • An error amplifier compares the input voltage to the reference voltage
  • A load connection is made outside the feedback loop
  • Correct Answer
    A feedback connection to an error amplifier is made directly to the load
  • By wireless inductive loops
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What is a three-terminal regulator?

  • A regulator that supplies three voltages at a constant current
  • Correct Answer
    A regulator containing a voltage reference, error amplifier, sensing resistors and transistors, and a pass element
  • A regulator containing three error amplifiers and sensing transistors
  • A regulator that supplies three voltages with variable current
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What are the important characteristics of a three-terminal regulator?

  • Maximum and minimum input voltage, minimum output current and maximum output voltage
  • Correct Answer
    Maximum and minimum input voltage, maximum output current and voltage
  • Maximum and minimum input voltage, minimum output voltage and maximum output current
  • Maximum and minimum input voltage, minimum output current and voltage
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What type of voltage regulator contains a voltage reference, error amplifier, sensing resistors and transistors, and a pass element in one package?

  • An op-amp regulator
  • Correct Answer
    A three-terminal regulator
  • A switching regulator
  • A zener regulator
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When extremely low ripple is required, or when the voltage supplied to the load must remain constant under conditions of large fluctuations of current and line voltage, a closed-loop amplifier is used to regulate the power supply. There are two main categories of electronic regulators. They are:

  • Correct Answer
    linear and switching
  • non-linear and switching
  • linear and non-linear
  • "stiff" and switching
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A modern type of regulator, which features a reference, high-gain amplifier, temperature-compensated voltage sensing resistors and transistors as well as a pass-element is commonly referred to as a:

  • nine-pin terminal regulator
  • Correct Answer
    three-terminal regulator
  • twenty-four pin terminal regulator
  • six-terminal regulator
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