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Take the quize
- 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
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