Practice Exam

T9A10

1. In which direction does a half-wave dipole antenna radiate the strongest signal?

• A. Equally in all directions
• B. Off the ends of the antenna
• C. In the direction of the feed line
• D. Broadside to the antenna

T0A11

2. What hazard exists in a power supply immediately after turning it off?

• A. Voltage transients from kickback diodes
• B. Leakage flux in the power transformer
• C. Circulating currents in the dc filter
• D. Charge stored in filter capacitors

T8A12

3. Which of the following is a disadvantage of FM compared with single sideband?

• A. Voice quality is poorer
• B. FM signals are harder to tune
• C. All these choices are correct
• D. Only one signal can be received at a time

T6C12

4. Which of the following is accurately represented in electrical schematics?

• A. Physical appearance of components
• B. Component connections
• C. Wire lengths
• D. All these choices are correct

T8C04

5. Which of the following is good procedure when contacting another station in a contest?

• A. All these choices are correct
• B. Contact the station twice to be sure that you are in his log
• C. Sign only the last two letters of your call if there are many other stations calling
• D. Send only the minimum information needed for proper identification and the contest exchange

T1A06

6. What is the FCC Part 97 definition of a beacon?

• A. A continuous transmission of weather information authorized in the amateur bands by the National Weather Service
• B. An amateur station transmitting communications for the purposes of observing propagation or related experimental activities
• C. A bulletin sent by the FCC to announce a national emergency
• D. A government transmitter marking the amateur radio band edges

T6D06

7. What component changes 120 V AC power to a lower AC voltage for other uses?

• A. Variable capacitor
• B. Transformer
• C. Transistor
• D. Diode

T2B13

8. What is the purpose of a squelch function?

• A. Reduce interference from impulse noise
• B. Reduce a CW transmitter's key clicks
• C. Mute the receiver audio when a signal is not present
• D. Eliminate parasitic oscillations in an RF amplifier

T8D06

9. What does the abbreviation "PSK" mean?

• A. Phased Slide Keying
• B. Phase Shift Keying
• C. Pulse Shift Keying
• D. Packet Short Keying

T3B01

10. What is the relationship between the electric and magnetic fields of an electromagnetic wave?

• A. They travel at different speeds
• B. They are in parallel
• C. They are at right angles
• D. They revolve in opposite directions

T2C03

11. What technique is used to ensure that voice messages containing unusual words are received correctly?

• A. Send the words by voice and Morse code
• B. Speak very loudly into the microphone
• C. Spell the words using a standard phonetic alphabet
• D. All these choices are correct

T6B02

12. What electronic component allows current to flow in only one direction?

• A. Fuse
• B. Resistor
• C. Driven element
• D. Diode

T5C10

13. How much power is delivered by a voltage of 12 volts DC and a current of 2.5 amperes?

• A. 4.8 watts
• B. 14.5 watts
• C. 30 watts
• D. 0.208 watts

T1B05

14. How may amateurs use the 219 to 220 MHz segment of 1.25 meter band?

• A. Fast-scan television only
• B. Fixed digital message forwarding systems only
• C. Spread spectrum only
• D. Emergency traffic only

T9B08

15. Which of the following is a source of loss in coaxial feed line?

• A. Multiple connectors in the line
• B. High SWR
• C. All these choices are correct
• D. Water intrusion into coaxial connectors

T0C10

16. Why is duty cycle one of the factors used to determine safe RF radiation exposure levels?

• A. It takes into account the antenna feed line loss
• B. It takes into account the thermal effects of the final amplifier
• C. It affects the average exposure to radiation
• D. It affects the peak exposure to radiation

T1F05

17. What method of call sign identification is required for a station transmitting phone signals?

• A. Send the call sign followed by the indicator RPT
• B. Send the call sign followed by the indicator R
• C. Send the call sign using a CW or phone emission
• D. Send the call sign using only a phone emission

T5A08

18. Which of the following is a good electrical insulator?

• A. Copper
• B. Aluminum
• C. Glass
• D. Mercury

T7D11

19. Which of the following precautions should be taken when measuring in-circuit resistance with an ohmmeter?

• A. Ensure that the circuit is not powered
• B. Ensure that the circuit is operating at the correct frequency
• C. Ensure that the applied voltages are correct
• D. Ensure that the circuit is grounded

T4A04

20. How are the transceiver audio input and output connected in a station configured to operate using FT8?

• A. To an FT8 conversion unit, a keyboard, and a computer monitor
• B. To a computer connected to the FT8converter.com website
• C. To the audio input and output of a computer running WSJT-X software
• D. To a computer running a terminal program and connected to a terminal node controller unit

T2A03

21. What is a common repeater frequency offset in the 70 cm band?

• A. Plus or minus 600 kHz
• B. Plus or minus 1 MHz
• C. Plus or minus 500 kHz
• D. Plus or minus 5 MHz

T8B06

22. Which of the following are inputs to a satellite tracking program?

• A. The Keplerian elements
• B. All these choices are correct
• C. The satellite transmitted power
• D. The last observed time of zero Doppler shift

T1D04

23. Under what conditions is an amateur station authorized to transmit music using a phone emission?

• A. When the music is transmitted above 1280 MHz
• B. When transmissions are limited to less than three minutes per hour
• C. When incidental to an authorized retransmission of manned spacecraft communications
• D. When the music produces no spurious emissions

T5D10

24. What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it?

• A. 1 volt
• B. 0.25 volts
• C. 1.5 volts
• D. 2.5 volts

T1C06

25. From which of the following locations may an FCC-licensed amateur station transmit?

• A. From within any country that belongs to the International Telecommunication Union
• B. From any vessel or craft located in international waters and documented or registered in the United States
• C. From within any country that is a member of the United Nations
• D. From anywhere within International Telecommunication Union (ITU) Regions 2 and 3

T7B05

26. How can fundamental overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?

• A. Switch the transmitter to a narrow-band mode
• B. Switch the transmitter from FM to SSB
• C. Block the amateur signal with a filter at the antenna input of the affected receiver
• D. Block the interfering signal with a filter on the amateur transmitter

T3A09

27. Which of the following results from the fact that signals propagated by the ionosphere are elliptically polarized?

• A. FM voice is unusable
• B. Either vertically or horizontally polarized antennas may be used for transmission or reception
• C. Both the transmitting and receiving antennas must be of the same polarization
• D. Digital modes are unusable

T0B03

28. Under what circumstances is it safe to climb a tower without a helper or observer?

• A. When no electrical work is being performed
• B. When the work being done is not more than 20 feet above the ground
• C. Never
• D. When no mechanical work is being performed

T7C05

29. Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level?

• A. To protect the output amplifier transistors
• B. To comply with FCC rules on spectral purity
• C. To lower the SWR on the transmission line
• D. Because power supplies cannot supply enough current at high SWR

T6A08

30. What is the function of an SPDT switch?

• A. A single circuit is opened or closed
• B. A single circuit is switched between one of two other circuits
• C. Two circuits are opened or closed
• D. Two circuits are each switched between one of two other circuits

T4B03

31. How is squelch adjusted so that a weak FM signal can be heard?

• A. Turn up the audio level until it overcomes the squelch threshold
• B. Enable squelch enhancement
• C. Set the squelch threshold so that receiver output audio is on all the time
• D. Turn on the anti-squelch function

T5B04

32. Which is equal to one microvolt?

• A. One thousand kilovolts
• B. One one-thousandth of a volt
• C. One million volts
• D. One one-millionth of a volt

T7A04

33. Which term describes the ability of a receiver to discriminate between multiple signals?

• A. Discrimination ratio
• B. Harmonic distortion
• C. Sensitivity
• D. Selectivity

T3C02

34. What is a characteristic of HF communication compared with communications on VHF and higher frequencies?

• A. HF accommodates wider bandwidth signals
• B. There is less atmospheric interference (static) on HF
• C. Long-distance ionospheric propagation is far more common on HF
• D. HF antennas are generally smaller

T1E07

35. When the control operator is not the station licensee, who is responsible for the proper operation of the station?

• A. Only the station licensee
• B. All licensed amateurs who are present at the operation
• C. Only the control operator
• D. The control operator and the station licensee