Practice Exam

E7F09

1. Why is an anti-aliasing filter required in a decimator?

• A. It notches out the sampling frequency to avoid sampling errors
• B. It removes high-frequency signal components that would otherwise be reproduced as lower frequency components
• C. It removes low-frequency signal components to eliminate the need for DC restoration
• D. It peaks the response of the decimator, improving bandwidth

E6D02

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

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

E2A06

3. What are Keplerian elements?

• A. Encrypting codes used for spread spectrum modulation
• B. Parameters that define the orbit of a satellite
• C. High-emission heater filaments used in magnetron tubes
• D. Phase reversing elements in a Yagi antenna

E1A11

4. What licensing is required when operating an amateur station aboard a US-registered vessel in international waters?

• A. Only General class or higher amateur licenses
• B. An unrestricted Radiotelephone Operator Permit
• C. Any amateur license with an FCC Marine or Aircraft endorsement
• D. Any FCC-issued amateur license

E8C06

5. What is the bandwidth of an FT8 signal?

• A. 2.4 kHz
• B. 600 Hz
• C. 10 Hz
• D. 50 Hz

E7E02

6. What is the function of a reactance modulator?

• A. Produce AM signals by varying an inductance
• B. Produce PM or FM signals by varying a resistance
• C. Produce PM or FM signals by varying a capacitance
• D. Produce AM signals by varying a resistance

E5C04

7. What type of Y-axis scale is most often used for graphs of circuit frequency response?

• A. Logarithmic
• B. Scatter
• C. Random
• D. Linear

E6C09

8. What is used to design the configuration of a field-programmable gate array (FPGA)?

• A. Machine and assembly language
• B. Hardware description language (HDL)
• C. Karnaugh maps
• D. An auto-router

E3C01

9. What is the cause of short-term radio blackouts?

• A. Sunspots on the solar equator
• B. Coronal mass ejections
• C. North-oriented interplanetary magnetic field
• D. Solar flares

E2C04

10. Which of the following frequencies can be used for amateur radio mesh networks?

• A. Frequencies shared with various unlicensed wireless data services
• B. Cable TV channels 41-43
• C. HF frequencies where digital communications are permitted
• D. The 60-meter band channel centered on 5373 kHz

E1B10

11. What frequencies are authorized to an amateur station operating under RACES rules?

• A. Specific segments in the amateur service MF, HF, VHF, and UHF bands
• B. Specific local government channels
• C. All these choices are correct
• D. All amateur service frequencies authorized to the control operator

E9G03

12. Which of the following is often determined using a Smith chart?

• A. Point-to-point propagation reliability as a function of frequency
• B. Impedance and SWR values in transmission lines
• C. Beam headings and radiation patterns
• D. Satellite azimuth and elevation bearings

E8B01

13. What is the modulation index of an FM signal?

• A. The ratio of modulating signal amplitude to frequency deviation
• B. The modulating signal frequency divided by the bandwidth of the transmitted signal
• C. The ratio of frequency deviation to modulating signal frequency
• D. The bandwidth of the transmitted signal divided by the modulating signal frequency

E9A01

14. What is an isotropic radiator?

• A. An omnidirectional, horizontally polarized, precisely calibrated antenna used to make field measurements of antenna gain
• B. A calibrated, unidirectional antenna used to make precise antenna gain measurements
• C. A hypothetical, lossless antenna having equal radiation intensity in all directions used as a reference for antenna gain
• D. A spacecraft antenna used to direct signals toward Earth

E6B06

15. Which of the following is a common use of a Schottky diode?

• A. As a VHF/UHF mixer or detector
• B. As a variable capacitance in an automatic frequency control circuit
• C. In oscillator circuits as the negative resistance element
• D. In power supplies as a constant voltage reference

E5A11

16. What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?

• A. 315.6 Hz
• B. 157.8 Hz
• C. 47.3 kHz
• D. 23.67 kHz

E9H04

17. What is the purpose of placing an electrostatic shield around a small-loop direction-finding antenna?

• A. It eliminates tracking errors caused by strong out-of-band signals
• B. It eliminates unbalanced capacitive coupling to the antenna's surroundings, improving the depth of its nulls
• C. It increases signal strength by providing a better match to the feed line
• D. It adds capacitive loading, increasing the bandwidth of the antenna

E7B09

18. What is characteristic of an emitter follower (or common collector) amplifier?

• A. Input and output signals in-phase
• B. Low input impedance and phase inversion from input to output
• C. Differential inputs and single output
• D. Acts as an OR circuit if one input is grounded

E7D15

19. What is the purpose of a step-start circuit in a high-voltage power supply?

• A. To allow the filter capacitors to charge gradually
• B. To provide a dual-voltage output for reduced power applications
• C. To compensate for variations of the incoming line voltage
• D. To prevent arcing across the input power switch or relay contacts

E3A02

20. What characterizes libration fading of an EME signal?

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

E2E09

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

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

E7C03

22. What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?

• A. Higher efficiency
• B. Greater harmonic suppression
• C. To eliminate one capacitor
• D. Greater transformation range

E7H03

23. What is a phase-locked loop?

• A. An electronic circuit also known as a monostable multivibrator
• B. An electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
• C. An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
• D. An electronic circuit consisting of a precision push-pull amplifier with a differential phase input

E9E11

24. What is the purpose of using multiple driven elements connected through phasing lines?

• A. To control the antenna's radiation pattern
• B. To create a low-angle radiation pattern
• C. To prevent harmonic radiation from the transmitter
• D. To allow single-band antennas to operate on other bands

E9B09

25. What type of analysis is commonly used for modeling antennas?

• A. Method of Moments
• B. Calculus differentiation with respect to physical properties
• C. Graphical analysis
• D. Mutual impedance analysis

E4D06

26. What is the term for the reduction in receiver sensitivity caused by a strong signal near the received frequency?

• A. Reciprocal mixing
• B. Cross modulation interference
• C. Desensitization
• D. Quieting

E0A10

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

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

E7G01

28. What is the typical output impedance of an op-amp?

• A. Very high
• B. Very low
• C. 10,000 ohms
• D. 100 ohms

E1C12

29. In what portion of the 630-meter band are phone emissions permitted?

• A. The entire band
• B. None
• C. Only the top 3 kHz
• D. Only the bottom 3 kHz

E5B12

30. What is admittance?

• A. The term for the on-impedance of a field effect transistor
• B. The inverse of impedance
• C. The term for the gain of a field effect transistor
• D. The inverse of reactance

E2D05

31. What is the characteristic of the JT65 mode?

• A. Uses only a 65 Hz bandwidth
• B. Permits fast-scan TV transmissions over narrow bandwidth
• C. Symbol rate is 65 baud
• D. Decodes signals with a very low signal-to-noise ratio

E1F05

32. Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

• A. 53 MHz - 54 MHz
• B. 222 MHz - 223 MHz
• C. 420 MHz - 430 MHz
• D. 440 MHz - 450 MHz

E9C09

33. Which of the following describes a G5RV antenna?

• A. A wire antenna center-fed through a specific length of open-wire line connected to a balun and coaxial feed line
• B. A wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun
• C. A phased array antenna consisting of multiple loops
• D. A multi-band trap antenna

E6A11

34. In Figure E6-1, which is the schematic symbol for a P-channel junction FET?

• A. 6
• B. 1
• C. 2
• D. 3

E4E12

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

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

E6E03

36. Which of the following materials supports the highest frequency of operation when used in MMICs?

• A. Silicon nitride
• B. Silicon dioxide
• C. Silicon
• D. Gallium nitride

E3B05

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

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

E9F08

38. Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric coaxial cable, assuming all other parameters are the same?

• A. Foam dielectric coaxial cable has lower safe maximum operating voltage
• B. Foam dielectric coaxial cable has lower loss per unit of length
• C. Foam dielectric coaxial cable has higher velocity factor
• D. All these choices are correct

E2B11

39. What is the function of the vertical interval signaling (VIS) code sent as part of an SSTV transmission?

• A. To identify the call sign of the station transmitting
• B. To lock the color burst oscillator in color SSTV images
• C. To provide vertical synchronization
• D. To identify the SSTV mode being used

E4A10

40. Which trigger mode is most effective when using an oscilloscope to measure a linear power supply's output ripple?

• A. Line
• B. Edge
• C. Single-shot
• D. Level

E4B09

41. Which of the following can be measured by a two-port vector network analyzer?

• A. Filter frequency response
• B. Pulse rise time
• C. Forward power
• D. Phase noise

E6F08

42. Why are optoisolators often used in conjunction with solid-state circuits that control 120 VAC circuits?

• A. Optoisolators provide a low-impedance link between a control circuit and a power circuit
• B. Optoisolators provide impedance matching between the control circuit and power circuit
• C. Optoisolators eliminate the effects of reflected light in the control circuit
• D. Optoisolators provide an electrical isolation between a control circuit and the circuit being switched

E8A10

43. What is the purpose of a low-pass filter used at the output of a digital-to-analog converter?

• A. All these choices are correct
• B. Improve accuracy by removing out-of-sequence codes from the input
• C. Remove spurious sampling artifacts from the output signal
• D. Lower the input bandwidth to increase the effective resolution

E8D09

44. 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

E5D12

45. What is reactive power?

• A. Wattless, nonproductive power
• B. Power consumed in circuit Q
• C. Power consumed by an inductor's wire resistance
• D. The power consumed in inductors and capacitors

E1E09

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

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

E4C12

47. How does a narrow-band roofing filter affect receiver performance?

• A. All these choices are correct
• B. It improves intelligibility by using low Q circuitry to reduce ringing
• C. It improves blocking dynamic range by attenuating strong signals near the receive frequency
• D. It improves sensitivity by reducing front-end noise

E9D11

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

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

E7A03

49. Which of the following can divide the frequency of a pulse train by 2?

• A. An OR gate
• B. A flip-flop
• C. An XOR gate
• D. A multiplexer

E1D03

50. What is a space telecommand station?

• A. An amateur station located on the surface of the Earth for communication with other Earth stations by means of Earth satellites
• B. An amateur station that transmits communications to initiate, modify, or terminate functions of a space station
• C. An amateur station located in a satellite or a balloon more than 50 kilometers above the surface of the Earth
• D. An amateur station that receives telemetry from a satellite or balloon more than 50 kilometers above the surface of the Earth