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?

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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