ECT002

20 Questions | Total Attempts: 13315

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ECT002

Priority Level: High (ECE & ECT)


Questions and Answers
  • 1. 
    What do the symbols on an electrical circuit schematic diagram represent?
    • A. 

      Electrical components

    • B. 

      Logic states

    • C. 

      Digital codes

    • D. 

      Traffic nodes

  • 2. 
    Which of the following is accurately represented in electrical circuit schematic diagrams?
    • A. 

      Wire lengths

    • B. 

      Physical appearance of components

    • C. 

      The way components are interconnected

    • D. 

      All of these choices are correct

  • 3. 
    Which of the following devices or circuits changes an alternating current into a varying direct current signal?
    • A. 

      Transformer

    • B. 

      Rectifier

    • C. 

      Amplifier

    • D. 

      Reflector

  • 4. 
    What best describes a relay?
    • A. 

      A switch controlled by an electromagnet

    • B. 

      A current controlled amplifier

    • C. 

      An optical sensor

    • D. 

      A pass transistor

  • 5. 
    Which of the following can be used to display signal strength on a numeric scale?
    • A. 

      Potentiometer

    • B. 

      Transistor

    • C. 

      Meter

    • D. 

      Relay

  • 6. 
    What component is commonly used to change 120V AC house current to a lower AC voltage for other uses?
    • A. 

      Variable capacitor

    • B. 

      Transformer

    • C. 

      Transistor

    • D. 

      Diode

  • 7. 
    Which of the following is commonly used as a visual indicator?
    • A. 

      LED

    • B. 

      FET

    • C. 

      Zener diode

    • D. 

      Bipolar transistor

  • 8. 
    Which of the following is used together with an inductor to make a tuned circuit?
    • A. 

      Resistor

    • B. 

      Zener diode

    • C. 

      Potentiometer

    • D. 

      Capacitor

  • 9. 
    What is the name of a device that combines several semiconductors and other components into one package?
    • A. 

      Transducer

    • B. 

      Multi-pole relay

    • C. 

      Integrated circuit

    • D. 

      Transformer

  • 10. 
    What is the purpose of a fuse in an electrical circuit?
    • A. 

      To prevent power supply ripple from damaging a circuit

    • B. 

      To interrupt power in case of overload

    • C. 

      To limit current to prevent shocks

    • D. 

      All of these choices are correct

  • 11. 
    Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere fuse?
    • A. 

      The larger fuse would be likely to blow because it is rated for higher current

    • B. 

      The power supply ripple would greatly increase

    • C. 

      Excessive current could cause a fire

    • D. 

      All of these choices are correct

  • 12. 
    What is the function of a product detector?
    • A. 

      Detect phase modulated signals

    • B. 

      Demodulate FM signals

    • C. 

      Detect CW and SSB signals

    • D. 

      Combine speech and RF signals

  • 13. 
    What is the function of a mixer in a superheterodyne receiver?
    • A. 

      To reject signals outside of the desired passband

    • B. 

      To combine signals from several stations together

    • C. 

      To shift the incoming signal to an intermediate frequency

    • D. 

      To connect the receiver with an auxiliary device, such as a TNC

  • 14. 
    What device takes the output of a low-powered 28 MHz SSB exciter and produces a 222 MHz output signal?
    • A. 

      High-pass filter

    • B. 

      Low-pass filter

    • C. 

      Transverter

    • D. 

      Phase converter

  • 15. 
    Which of the following circuits combines a speech signal and an RF carrier?
    • A. 

      Beat frequency oscillator

    • B. 

      Discriminator

    • C. 

      Modulator

    • D. 

      Noise blanker

  • 16. 
    Which of the following circuits demodulates FM signals?
    • A. 

      Limiter

    • B. 

      Discriminator

    • C. 

      Product detector

    • D. 

      Phase inverter

  • 17. 
    Which term describes the ability of a receiver to discriminate between multiple signals?
    • A. 

      Tuning rate

    • B. 

      Sensitivity

    • C. 

      Selectivity

    • D. 

      Noise floor

  • 18. 
    Where is an RF preamplifier installed?
    • A. 

      Between the antenna and receiver

    • B. 

      At the output of the transmitter’s power amplifier

    • C. 

      Between a transmitter and antenna tuner

    • D. 

      At the receiver’s audio output

  • 19. 
    Why are UHF signals often more effective from inside buildings than VHF signals?
    • A. 

      VHF signals lose power faster over distance

    • B. 

      The shorter wavelength allows them to more easily penetrate the structure of buildings

    • C. 

      This is incorrect; VHF works better than UHF inside buildings

    • D. 

      UHF antennas are more efficient than VHF antennas

  • 20. 
    What should you do if another operator reports that your station’s 2 meter signals were strong just a moment ago, but now they are weak or distorted?
    • A. 

      Change the batteries in your radio to a different type

    • B. 

      Turn on the CTCSS tone

    • C. 

      Ask the other operator to adjust his squelch control

    • D. 

      Try moving a few feet, as random reflections may be causing multi-path distortion