How does a linear electronic voltage regulator work?

  1. It has a ramp voltage as its output
  2. It eliminates the need for a pass transistor
  3. The control element duty cycle is proportional to the line or load conditions
  4. The conduction of a control element is varied to maintain a constant output voltage


What is a characteristic of a switching electronic voltage regulator?

  1. The resistance of a control element is varied in direct proportion to the line voltage or load current
  2. It is generally less efficient than a linear regulator
  3. The controlled device's duty cycle is changed to produce a constant average output voltage
  4. It gives a ramp voltage at its output


What device is typically used as a stable voltage reference in a linear voltage regulator?

  1. A Zener diode
  2. A tunnel diode
  3. An SCR
  4. A varactor diode


Which of the following types of linear voltage regulator usually make the most efficient use of the primary power source?

  1. A series current source
  2. A series regulator
  3. A shunt regulator
  4. A shunt current source


Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?

  1. A constant current source
  2. A series regulator
  3. A shunt current source
  4. A shunt regulator


What is the purpose of Q1 in the circuit shown in Figure E7-2?

  1. It provides negative feedback to improve regulation
  2. It provides a constant load for the voltage source
  3. It controls the current supplied to the load
  4. It provides D1 with current
Circuit Diagram


What is the purpose of C2 in the circuit shown in Figure E7-2?

  1. It bypasses rectifier output ripple around D1
  2. It is a brute force filter for the output
  3. To self-resonate at the hum frequency
  4. To provide fixed DC bias for Q1
Circuit Diagram


What type of circuit is shown in Figure E7-2?

  1. Switching voltage regulator
  2. Grounded emitter amplifier
  3. Linear voltage regulator
  4. Monostable multivibrator
Circuit Diagram


What is the main reason to use a charge controller with a solar power system?

  1. Prevention of battery undercharge
  2. Control of electrolyte levels during battery discharge
  3. Prevention of battery damage due to overcharge
  4. Matching of day and night charge rates


What is the primary reason that a high-frequency switching type high-voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

  1. The inverter design does not require any output filtering
  2. It uses a diode bridge rectifier for increased output
  3. The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output
  4. It uses a large power factor compensation capacitor to recover power from the unused portion of the AC cycle


What is the function of the pass transistor in a linear voltage regulator circuit?

  1. Permits a wide range of output voltage settings
  2. Provides a stable input impedance over a wide range of source voltage
  3. Maintains nearly constant output impedance over a wide range of load current
  4. Maintains nearly constant output voltage over a wide range of load current


What is the dropout voltage of an analog voltage regulator?

  1. Minimum input voltage for rated power dissipation
  2. Maximum output voltage drops when the input voltage is varied over its specified range
  3. Minimum input-to-output voltage required to maintain regulation
  4. Maximum that the output voltage may decrease at rated load


What is the equation for calculating power dissipated by a series linear voltage regulator?

  1. Input voltage multiplied by input current
  2. Input voltage divided by output current
  3. Voltage difference from input to output multiplied by output current
  4. Output voltage multiplied by output current


What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?

  1. Equalize the voltage across each capacitor
  2. Discharge the capacitors when voltage is removed
  3. Provide a minimum load on the supply
  4. All these choices are correct


What is the purpose of a step-start circuit in a high-voltage power supply?

  1. To provide a dual-voltage output for reduced power applications
  2. To compensate for variations of the incoming line voltage
  3. To allow for remote control of the power supply
  4. To allow the filter capacitors to charge gradually