Topic T6D Quick Review Audio


Which of the following devices or circuits changes an alternating current into a varying direct current signal?

  1. Transformer
  2. Rectifier
  3. Amplifier
  4. Reflector


What is a relay?

  1. An electrically-controlled switch
  2. A current controlled amplifier
  3. An optical sensor
  4. A pass transistor


What type of switch is represented by component 3 in figure T2?

  1. Single-pole single-throw
  2. Single-pole double-throw
  3. Double-pole single-throw
  4. Double-pole double-throw
Circuit Diagram


Which of the following displays an electrical quantity as a numeric value?

  1. Potentiometer
  2. Transistor
  3. Meter
  4. Relay


What type of circuit controls the amount of voltage from a power supply?

  1. Regulator
  2. Oscillator
  3. Filter
  4. Phase inverter


What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?

  1. Variable capacitor
  2. Transformer
  3. Transistor
  4. Diode


Which of the following is commonly used as a visual indicator?

  1. LED
  2. FET
  3. Zener diode
  4. Bipolar transistor


Which of the following is combined with an inductor to make a tuned circuit?

  1. Resistor
  2. Zener diode
  3. Potentiometer
  4. Capacitor


What is the name of a device that combines several semiconductors and other components into one package?

  1. Transducer
  2. Multi-pole relay
  3. Integrated circuit
  4. Transformer


What is the function of component 2 in Figure T1?

  1. Give off light when current flows through it
  2. Supply electrical energy
  3. Control the flow of current
  4. Convert electrical energy into radio waves
Circuit Diagram


Which of the following is a resonant or tuned circuit?

  1. An inductor and a capacitor connected in series or parallel to form a filter
  2. A type of voltage regulator
  3. A resistor circuit used for reducing standing wave ratio
  4. A circuit designed to provide high-fidelity audio


Which of the following is a common reason to use shielded wire?

  1. To decrease the resistance of DC power connections
  2. To increase the current carrying capability of the wire
  3. To prevent coupling of unwanted signals to or from the wire
  4. To couple the wire to other signals