Practice Exam

G9B05

1. How does antenna height affect the azimuthal radiation pattern of a horizontal dipole HF antenna at elevation angles higher than about 45 degrees?

• A. If the antenna is less than 1/2 wavelength high, the azimuthal pattern is almost omnidirectional
• B. If the antenna is less than 1/2 wavelength high, radiation off the ends of the wire is eliminated
• C. Antenna height has no effect on the pattern
• D. If the antenna is too high, the pattern becomes unpredictable

G3B08

2. What does MUF stand for?

• A. The Maximum Usable Frequency during a 24-hour period
• B. The Minimum Usable Frequency during a 24-hour period
• C. The Maximum Usable Frequency for communications between two points
• D. The Minimum Usable Frequency for communications between two points

G6A06

3. Why should wire-wound resistors not be used in RF circuits?

• A. The resistor's inductance could make circuit performance unpredictable
• B. The resistor's internal capacitance would detune the circuit
• C. The resistor could overheat
• D. The resistor's tolerance value would not be adequate

G0A04

4. What does "time averaging" mean when evaluating RF radiation exposure?

• A. The total time of the exposure
• B. The total RF exposure averaged over a certain period
• C. The average amount of power developed by the transmitter over a specific 24-hour period
• D. The average time it takes RF radiation to have any long-term effect on the body

G8B10

5. What is the relationship between transmitted symbol rate and bandwidth?

• A. Bandwidth is half the symbol rate
• B. Lower symbol rates require wider bandwidth
• C. Higher symbol rates require wider bandwidth
• D. Symbol rate and bandwidth are not related

G7C12

6. What is the frequency above which a low-pass filter's output power is less than half the input power?

• A. Cutoff frequency
• B. Notch frequency
• C. Neper frequency
• D. Rolloff frequency

G0B10

7. Which of the following is a danger from lead-tin solder?

• A. RF energy can convert the lead into a poisonous gas
• B. Lead can contaminate food if hands are not washed carefully after handling the solder
• C. Tin in the solder can "cold flow," causing shorts in the circuit
• D. High voltages can cause lead-tin solder to disintegrate suddenly

G1B10

8. What is the power limit for beacon stations?

• A. 100 watts PEP output
• B. 200 watts PEP output
• C. 10 watts PEP output
• D. 20 watts PEP output

G5A10

9. Which of the following devices can be used for impedance matching at radio frequencies?

• A. All these choices are correct
• B. A Pi-network
• C. A length of transmission line
• D. A transformer

G4B04

10. What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?

• A. The attenuated RF output of the transmitter
• B. The local oscillator of the transmitter
• C. An external RF oscillator
• D. The transmitter balanced mixer output

G5C02

11. What is the output voltage if an input signal is applied to the secondary winding of a 4:1 voltage step-down transformer instead of the primary winding?

• A. The input voltage is multiplied by 4
• B. Additional resistance must be added in series with the primary to prevent overload
• C. Additional resistance must be added in parallel with the secondary to prevent overload
• D. The input voltage is divided by 4

G2A03

12. Which mode is most commonly used for SSB voice communications in the VHF and UHF bands?

• A. Lower sideband
• B. Suppressed sideband
• C. Upper sideband
• D. Double sideband

G1D08

13. Which of the following criteria must be met for a non-US citizen to be an accredited Volunteer Examiner?

• A. The person must hold an FCC granted amateur radio license of General class or above
• B. The person must be a resident of the US for a minimum of 5 years
• C. The person's home citizenship must be in ITU region 2
• D. None of these choices is correct; a non-US citizen cannot be a Volunteer Examiner

G4E04

14. Why should DC power for a 100-watt HF transceiver not be supplied by a vehicle's auxiliary power socket?

• A. Drawing more than 50 watts from this socket could cause the engine to overheat
• B. The socket is not wired with an RF-shielded power cable
• C. The DC polarity of the socket is reversed from the polarity of modern HF transceivers
• D. The socket's wiring may be inadequate for the current drawn by the transceiver

G1E04

15. Which of the following conditions require a licensed amateur radio operator to take specific steps to avoid harmful interference to other users or facilities?

• A. When operating within one mile of an FCC Monitoring Station
• B. When a station is transmitting spread spectrum emissions
• C. All these choices are correct
• D. When using a band where the Amateur Service is secondary

G2D06

16. How is a directional antenna pointed when making a "long-path" contact with another station?

• A. Along the gray line
• B. 180 degrees from the station's short-path heading
• C. Toward the rising sun
• D. Toward the north

G1C07

17. What must be done before using a new digital protocol on the air?

• A. Type-certify equipment to FCC standards
• B. Obtain an experimental license from the FCC
• C. Submit a rule-making proposal to the FCC describing the codes and methods of the technique
• D. Publicly document the technical characteristics of the protocol

G9C03

18. How do the lengths of a three-element Yagi reflector and director compare to that of the driven element?

• A. The reflector is longer, and the director is shorter
• B. The reflector is shorter, and the director is longer
• C. They are all the same length
• D. Relative length depends on the frequency of operation

G1A09

19. Which of the following frequencies is within the General class portion of the 15-meter band?

• A. 18155 kHz
• B. 21300 kHz
• C. 14250 kHz
• D. 24900 kHz

G7B02

20. Which of these classes of amplifiers has the highest efficiency?

• A. Class C
• B. Class AB
• C. Class B
• D. Class A

G2E12

21. Which of the following describes Winlink?

• A. A form of Packet Radio
• B. A wireless network capable of both VHF and HF band operation
• C. All of the above
• D. An amateur radio wireless network to send and receive email on the internet

G2C11

22. What does the Q signal "QRV" mean?

• A. You are sending too fast
• B. There is interference on the frequency
• C. I am quitting for the day
• D. I am ready to receive

G8A03

23. What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?

• A. Frequency modulation
• B. Frequency transformation
• C. Frequency convolution
• D. Frequency conversion

G5B07

24. What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?

• A. The peak value
• B. The RMS value
• C. The reciprocal of the RMS value
• D. The peak-to-peak value

G6B11

25. What is an SMA connector?

• A. A small threaded connector suitable for signals up to several GHz
• B. A type-S to type-M adaptor
• C. A type of push-on connector intended for high-voltage applications
• D. A connector designed for serial multiple access signals

G8C08

26. Which of the following statements is true about PSK31?

• A. Error correction is used to ensure accurate message reception
• B. Upper case letters are sent with more power
• C. Higher power is needed as compared to RTTY for similar error rates
• D. Upper case letters use longer Varicode bit sequences and thus slow down transmission

G2B11

27. How often may RACES training drills and tests be routinely conducted without special authorization?

• A. No more than 2 hours per month
• B. No more than 1 hour per week
• C. No more than 1 hour per month
• D. No more than 2 hours per week

G9A10

28. What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?

• A. 2:1
• B. 5:1
• C. 1:2
• D. 1:5

G3A10

29. What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

• A. Long term oscillations in the upper atmosphere
• B. Cyclic variation in Earth's radiation belts
• C. The position of the Moon in its orbit
• D. Rotation of the Sun's surface layers around its axis

G9D10

30. In which direction or directions does an electrically small loop (less than 1/10 wavelength in circumference) have nulls in its radiation pattern?

• A. Broadside and in the plane of the loop
• B. Broadside to the loop
• C. In the plane of the loop
• D. Electrically small loops are omnidirectional

G4D08

31. What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

• A. 7.1765 MHz to 7.1795 MHz
• B. 7.178 MHz to 7.184 MHz
• C. 7.178 MHz to 7.181 MHz
• D. 7.175 MHz to 7.178 MHz

G4C07

32. Why should soldered joints not be used in lightning protection ground connections?

• A. Solder flux will prevent a low conductivity connection
• B. All these choices are correct
• C. A soldered joint will likely be destroyed by the heat of a lightning strike
• D. Solder has too high a dielectric constant to provide adequate lightning protection

G3C07

33. What makes HF scatter signals often sound distorted?

• A. The E region is not present
• B. Energy is scattered into the skip zone through several different paths
• C. Ground waves are absorbing much of the signal
• D. The ionospheric region involved is unstable

G7A09

34. Which symbol in figure G7-1 represents a field effect transistor?

• A. Symbol 4
• B. Symbol 2
• C. Symbol 1
• D. Symbol 5

G4A11

35. Why should the ALC system be inactive when transmitting AFSK data signals?

• A. All these choices are correct
• B. When using digital modes, too much ALC activity can cause the transmitter to overheat
• C. ALC will invert the modulation of the AFSK mode
• D. The ALC action distorts the signal