Practice Exam

E2D10

1. What does the packet path WIDE3-1 designate?

• A. Three digipeater hops are requested with one remaining
• B. Three stations are allowed on frequency, one transmitting at a time
• C. Three subcarriers are permitted, subcarrier one is being used
• D. Three internet gateway stations may receive one transmission

E4C09

2. Which of the following choices is a good reason for selecting a high IF for a superheterodyne HF or VHF communications receiver?

• A. Reduced drift
• B. Improved receiver noise figure
• C. Easier for front-end circuitry to eliminate image responses
• D. Fewer components in the receiver

E7E01

3. Which of the following can be used to generate FM phone signals?

• A. Balanced modulation of a local oscillator
• B. Reactance modulation of a local oscillator
• C. Balanced modulation of the audio amplifier
• D. Reactance modulation of the final amplifier

E3B05

4. Which of the following paths is most likely to support long-distance propagation on 160 meters?

• A. Paths at high latitudes
• B. A path entirely in sunlight
• C. A direct north-south path
• D. A path entirely in darkness

E3C04

5. What does the value of Bz (B sub z) represent?

• A. North-south strength of the interplanetary magnetic field
• B. Duration of long-delayed echoes
• C. Geomagnetic field stability
• D. Critical frequency for vertical transmissions

E5D05

6. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF?

• A. Skin effect
• B. Dielectric leakage
• C. Shunt capacitance
• D. Inductance

E9A09

7. What is antenna efficiency?

• A. Total resistance divided by radiation resistance
• B. Radiation resistance divided by transmission resistance
• C. Effective radiated power divided by transmitter output
• D. Radiation resistance divided by total resistance

E4A05

8. What is the purpose of using a prescaler with a frequency counter?

• A. Prevent oscillation in a low-frequency counter circuit
• B. Multiply a higher frequency signal so a low-frequency counter can display the operating frequency
• C. Amplify low-level signals for more accurate counting
• D. Reduce the signal frequency to within the counter's operating range

E8C14

9. What type of addresses do nodes have in a mesh network?

• A. Trust server
• B. Email
• C. Talk group
• D. Internet Protocol (IP)

E7F08

10. What is the function of decimation?

• A. Removing unnecessary significant digits
• B. Reducing the effective sample rate by removing samples
• C. Converting data to binary-coded decimal form
• D. Attenuating the signal

E2B05

11. Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

• A. The vestigial sideband carries the audio information
• B. Vestigial sideband reduces the bandwidth while increasing the fidelity of low frequency video components
• C. Vestigial sideband provides high frequency emphasis to sharpen the picture
• D. The vestigial sideband contains chroma information

E9C01

12. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/2- wavelength apart and fed 180 degrees out of phase?

• A. Cardioid
• B. A figure-eight broadside to the axis of the array
• C. A figure-eight oriented along the axis of the array
• D. Omni-directional

E6C11

13. In Figure E6-3, which is the schematic symbol for the NOT operation (inversion)?

• A. 6
• B. 4
• C. 2
• D. 5

E7G06

14. What is the gain-bandwidth of an operational amplifier?

• A. The maximum frequency for a filter circuit using that type of amplifier
• B. The frequency at which the open-loop gain of the amplifier equals one
• C. The gain of the amplifier at a filter's cutoff frequency
• D. The frequency at which the amplifier's offset voltage is zero

E6B01

15. What is the most useful characteristic of a Zener diode?

• A. An internal capacitance that varies with the applied voltage
• B. A negative resistance region
• C. A constant voltage drop under conditions of varying current
• D. A constant current drop under conditions of varying voltage

E4B08

16. Which of the following can be used to determine the Q of a series-tuned circuit?

• A. The resonant frequency of the circuit
• B. The frequency shift
• C. The bandwidth of the circuit's frequency response
• D. The ratio of inductive reactance to capacitive reactance

E8B07

17. Orthogonal frequency-division multiplexing (OFDM) is a technique used for which types of amateur communication?

• A. Digital modes
• B. EME
• C. Extremely low-power contacts
• D. OFDM signals are not allowed on amateur bands

E0A10

18. When must an RF exposure evaluation be performed on an amateur station operating on 80 meters?

• A. When the ERP of the station is less than 10 watts
• B. An evaluation must always be performed
• C. When the station's operating mode is CW
• D. When the output power from the transmitter is less than 100 watts

E1F10

19. Who may be the control operator of an auxiliary station?

• A. Only General, Advanced, or Amateur Extra class operators
• B. Only Technician, General, Advanced, or Amateur Extra class operators
• C. Only Amateur Extra class operators
• D. Any licensed amateur operator

E9G04

20. What are the two families of circles and arcs that make up a Smith chart?

• A. Voltage and impedance
• B. Resistance and reactance
• C. Reactance and voltage
• D. Inductance and capacitance

E6A01

21. In what application is gallium arsenide used as a semiconductor material?

• A. In high-power audio circuits
• B. In microwave circuits
• C. In high-current rectifier circuits
• D. In very low-frequency RF circuits

E2C12

22. What indicates the delay between a control operator action and the corresponding change in the transmitted signal?

• A. Anti-VOX
• B. Hang time
• C. Latency
• D. Jitter

E9H05

23. What challenge is presented by a small wire-loop antenna for direction finding?

• A. It is practical for use only on VHF and higher bands
• B. It does not have a clearly defined null
• C. All these choices are correct
• D. It has a bidirectional null pattern

E1B05

24. What is the National Radio Quiet Zone?

• A. An area surrounding the National Radio Astronomy Observatory
• B. An area in Florida surrounding Cape Canaveral
• C. An area in New Mexico surrounding the White Sands Test Area
• D. An area surrounding the FCC monitoring station in Laurel, Maryland

E7B11

25. In Figure E7-1, what is the purpose of R3?

• A. Output load resistor
• B. Self bias
• C. Fixed bias
• D. Emitter bypass

E2E09

26. Which of the following HF digital modes uses variable-length character coding?

• A. MT63
• B. PACTOR
• C. RTTY
• D. PSK31

E7C09

27. What is a crystal lattice filter?

• A. A filter using lattice-shaped quartz crystals for high-Q performance
• B. A filter for low-level signals made using quartz crystals
• C. An audio filter made with four quartz crystals that resonate at 1 kHz intervals
• D. A power supply filter made with interlaced quartz crystals

E7D03

28. What device is used as a stable voltage reference?

• A. An analog-to-digital converter
• B. A digital-to-analog converter
• C. An SCR
• D. A Zener diode

E3A02

29. What characterizes libration fading of an EME signal?

• A. A slow change in the pitch of the CW signal
• B. A fluttery, irregular fading
• C. The returning echo is several hertz lower in frequency than the transmitted signal
• D. A gradual loss of signal as the sun rises

E9D11

30. Why do most two-element Yagis with normal spacing have a reflector instead of a director?

• A. Greater front-to-side
• B. Higher receiving directivity factor
• C. Lower SWR
• D. Higher gain

E5B09

31. What is the relationship between the AC current through a capacitor and the voltage across a capacitor?

• A. Voltage and current are 180 degrees out of phase
• B. Voltage leads current by 90 degrees
• C. Voltage and current are in phase
• D. Current leads voltage by 90 degrees

E9F09

32. What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is shorted at the far end?

• A. The same as the characteristic impedance of the transmission line
• B. Very low impedance
• C. Very high impedance
• D. The same as the generator output impedance

E6D02

33. What is the equivalent circuit of a quartz crystal?

• A. Parallel RLC, where C is the series combination of resonance capacitance of the crystal and electrode and stray capacitance
• B. Series RLC in parallel with a shunt C representing electrode and stray capacitance
• C. Series RLC, where C is the parallel combination of resonance capacitance of the crystal and electrode and stray capacitance
• D. Parallel RLC, where C is the parallel combination of resonance capacitance of the crystal and electrode and stray capacitance

E7H05

34. How is positive feedback supplied in a Pierce oscillator?

• A. Through a tapped coil
• B. Through a neutralizing capacitor
• C. Through a quartz crystal
• D. Through link coupling

E7A06

35. What is a characteristic of a monostable multivibrator?

• A. It stores one bit of data
• B. It produces a continuous square wave
• C. It switches temporarily to an alternate state for a set time
• D. It maintains a constant output voltage, regardless of variations in the input voltage

E8A03

36. Which of the following describes a signal in the time domain?

• A. Frequency at different times
• B. Discrete impulses in time order
• C. Amplitude at different times
• D. Power at intervals of phase

E1D01

37. What is the definition of telemetry?

• A. One-way transmission of measurements at a distance from the measuring instrument
• B. Two-way transmissions of data
• C. One-way transmission that initiates, modifies, or terminates the functions of a device at a distance
• D. Two-way transmissions in excess of 1000 feet

E4E12

38. What causes interference received as a series of carriers at regular intervals across a wide frequency range?

• A. Wireless security camera transmitters
• B. Switch-mode power supplies
• C. Electric fences
• D. Radar transmitters

E5A10

39. What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries, and C is 10 picofarads?

• A. 7.12 MHz
• B. 23.5 MHz
• C. 7.12 kHz
• D. 23.5 kHz

E1E09

40. What may be the penalty for a VE who fraudulently administers or certifies an examination?

• A. Revocation of the VE's amateur station license grant and the suspension of the VE's amateur operator license grant
• B. All these choices are correct
• C. A fine of up to $1,000 per occurrence
• D. A sentence of up to one year in prison

E1C09

41. What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?

• A. 3.0
• B. 1.0
• C. 2.0
• D. 0.5

E4D13

42. What is the received signal level with a transmit power of 10 W (+40 dBm), a transmit antenna gain of 6 dBi, a receive antenna gain of 3 dBi, and a path loss of 100 dB?

• A. -60 dBm
• B. -57 dBm
• C. -54 dBm
• D. -51 dBm

E9E05

43. What Yagi driven element feed point impedance is required to use a beta or hairpin matching system?

• A. Purely reactive
• B. Purely resistive
• C. Inductive (driven element electrically longer than 1/2 wavelength)
• D. Capacitive (driven element electrically shorter than 1/2 wavelength)

E1A03

44. What is the highest legal carrier frequency on the 20-meter band for transmitting a 2.8 kHz wide USB data signal?

• A. 14.3490 MHz
• B. 14.1002 MHz
• C. 14.1472 MHz
• D. 14.0708 MHz

E9B06

45. What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?

• A. 75 degrees
• B. 25 degrees
• C. 45 degrees
• D. 7.5 degrees

E6E10

46. What advantage does surface-mount technology offer at RF compared to using through-hole components?

• A. Shorter circuit board traces
• B. All these choices are correct
• C. Components have less parasitic inductance and capacitance
• D. Smaller circuit area

E2A12

47. What is the purpose of digital store-and-forward functions on an amateur radio satellite?

• A. To delay download of telemetry between satellites
• B. To hold digital messages in the satellite for later download
• C. To relay messages between satellites
• D. To upload operational software for the transponder

E5C05

48. What kind of diagram is used to show the phase relationship between impedances at a given frequency?

• A. Near field diagram
• B. Venn diagram
• C. Far field diagram
• D. Phasor diagram

E6F09

49. What is the efficiency of a photovoltaic cell?

• A. The output RF power divided by the input DC power
• B. The open-circuit voltage divided by the short-circuit current under full illumination
• C. The relative fraction of light that is converted to current
• D. The output in lumens divided by the input power in watts

E8D09

50. What is considered an acceptable maximum IMD level for an idling PSK signal?

• A. +5 dB
• B. -30 dB
• C. +10 dB
• D. +15 dB