Practice Exam

E4B09

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

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

E9A11

2. Which of the following determines ground losses for a ground-mounted vertical antenna operating on HF?

• A. The standing wave ratio
• B. Soil conductivity
• C. Take-off angle
• D. Distance from the transmitter

E3C08

3. Which of the following is the space-weather term for an extreme geomagnetic storm?

• A. B9
• B. X5
• C. M9
• D. G5

E4C04

4. What is the noise figure of a receiver?

• A. The ratio in dB of the noise generated in the receiver to atmospheric noise
• B. The ratio of the noise bandwidth in hertz to the theoretical bandwidth of a resistive network
• C. The ratio in dB of the noise generated by the receiver to the theoretical minimum noise
• D. The ratio of atmospheric noise to phase noise

E7E04

5. What is one way to produce a single-sideband phone signal?

• A. Use a balanced modulator followed by a filter
• B. Use a reactance modulator followed by a mixer
• C. Use a loop modulator followed by a mixer
• D. Use a product detector with a DSB signal

E7D03

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

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

E1F11

7. Which of the following best describes one of the standards that must be met by an external RF power amplifier if it is to qualify for a grant of FCC certification?

• A. It must satisfy the FCC's spurious emission standards when operated at the lesser of 1500 watts or its full output power
• B. It must have received an Underwriters Laboratory certification for electrical safety as well as having met IEEE standard 14.101(B)
• C. It must produce full legal output when driven by not more than 5 watts of mean RF input power
• D. It must exhibit a gain of less than 23 dB when driven by 10 watts or less

E1A05

8. Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?

• A. Only a person with an FCC Marine Radio license grant
• B. Only a person named in an amateur station license grant
• C. Any person named in an amateur station license grant or a person holding an unrestricted Radiotelephone Operator Permit
• D. Any person holding an FCC issued amateur license or who is authorized for alien reciprocal operation

E2E08

9. Which of the following HF digital modes can be used to transfer binary files?

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

E1D10

10. Which amateur stations are eligible to be telecommand stations of space stations, subject to the privileges of the class of operator license held by the control operator of the station?

• A. Any amateur station so designated by the space station licensee
• B. Any amateur station so designated by the ITU
• C. Any amateur station approved by AMSAT
• D. All these choices are correct

E6C03

11. What is tri-state logic?

• A. A counter with eight states
• B. Logic devices that utilize ternary math
• C. Logic devices with 0, 1, and high-impedance output states
• D. Logic with three output impedances which can be selected to better match the load impedance

E9E07

12. What parameter describes the interaction of a load and transmission line?

• A. Dielectric constant
• B. Reflection coefficient
• C. Velocity factor
• D. Characteristic impedance

E5B09

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

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

E5C01

14. Which of the following represents pure capacitive reactance of 100 ohms in rectangular notation?

• A. 100 - j0
• B. 0 + j100
• C. 100 + j0
• D. 0 - j100

E5A11

15. 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. 23.67 kHz
• D. 47.3 kHz

E1E02

16. Who is tasked by Part 97 with maintaining the pools of questions for all US amateur license examinations?

• A. The FCC
• B. The ARRL
• C. The VECs
• D. The VEs

E9B11

17. What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?

• A. The computed feed point impedance may be incorrect
• B. Ground conductivity will not be accurately modeled
• C. The resulting design will favor radiation of harmonic energy
• D. The antenna will become mechanically unstable

E4E08

18. What current flows equally on all conductors of an unshielded multiconductor cable?

• A. Reactive current only
• B. Magnetically-coupled current only
• C. Common-mode current
• D. Differential-mode current

E3A04

19. In what direction does an electromagnetic wave travel?

• A. It travels parallel to the electric and magnetic fields
• B. It depends on the phase angle of the electric field
• C. It travels at a right angle to the electric and magnetic fields
• D. It depends on the phase angle of the magnetic field

E2D05

20. What is the characteristic of the JT65 mode?

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

E6F07

21. What is a solid-state relay?

• A. A mechanical relay that latches in the on or off state each time it is pulsed
• B. A relay that uses transistors to drive the relay coil
• C. A semiconductor switch that uses a monostable multivibrator circuit
• D. A device that uses semiconductors to implement the functions of an electromechanical relay

E9H05

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

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

E6E09

23. Which of the following component package types have the least parasitic effects at frequencies above the HF range?

• A. TO-220
• B. Radial lead
• C. Surface mount
• D. Axial lead

E8C10

24. How can data rate be increased without increasing bandwidth?

• A. Using forward error correction
• B. It is impossible
• C. Increasing analog-to-digital conversion resolution
• D. Using a more efficient digital code

E7G01

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

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

E9C09

26. Which of the following describes a G5RV antenna?

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

E9F06

27. What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?

• A. 8.5 meters
• B. 13.3 meters
• C. 7.0 meters
• D. 10.6 meters

E2B01

28. In digital television, what does a coding rate of 3/4 mean?

• A. 25% of the data sent is forward error correction data
• B. Data compression reduces data rate by 3/4
• C. Three, four-bit words are used to transmit each pixel
• D. 1/4 of the time interval is used as a guard interval

E8A06

29. What is the approximate ratio of PEP-to-average power in an unprocessed single-sideband phone signal?

• A. 13 to 1
• B. 1 to 1
• C. 25 to 1
• D. 2.5 to 1

E6B09

30. What is a common use for point-contact diodes?

• A. As a constant voltage source
• B. As a constant current source
• C. As an RF detector
• D. As a high-voltage rectifier

E8B08

31. What describes orthogonal frequency-division multiplexing (OFDM)?

• A. A digital mode for narrow-band, slow-speed transmissions
• B. A frequency modulation technique that uses non-harmonically related frequencies
• C. A bandwidth compression technique using Fourier transforms
• D. A digital modulation technique using subcarriers at frequencies chosen to avoid intersymbol interference

E7C07

32. Which describes a Pi-L network?

• A. A Pi-network with an additional output series inductor
• B. A Phase Inverter Load network
• C. A network with only three discrete parts
• D. A matching network in which all components are isolated from ground

E6D07

33. What is the current that flows in the primary winding of a transformer when there is no load on the secondary winding?

• A. Direct current
• B. Stabilizing current
• C. Excitation current
• D. Magnetizing current

E7F08

34. What is the function of decimation?

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

E9D11

35. 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. Lower SWR
• D. Greater front-to-side

E8D07

36. What is a common cause of overmodulation of AFSK signals?

• A. Excessive numbers of retries
• B. Excessive frequency deviation
• C. Bit errors in the modem
• D. Excessive transmit audio levels

E0A05

37. What hazard is created by operating at microwave frequencies?

• A. Microwaves are ionizing radiation
• B. The high gain antennas commonly used can result in high exposure levels
• C. Microwaves are in the frequency range where wave velocity is higher
• D. The extremely high frequency energy can damage the joints of antenna structures

E4A07

38. Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge?

• A. Antenna analyzers automatically tune your antenna for resonance
• B. Antenna analyzers compute SWR and impedance automatically
• C. Antenna analyzers display a time-varying representation of the modulation envelope
• D. All these choices are correct

E4D13

39. 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. -57 dBm
• B. -54 dBm
• C. -60 dBm
• D. -51 dBm

E6A11

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

• A. 6
• B. 3
• C. 1
• D. 2

E2C12

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

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

E1B10

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

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

E7B11

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

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

E5D02

44. Why is it important to keep lead lengths short for components used in circuits for VHF and above?

• A. To maintain component lifetime
• B. To increase the thermal time constant
• C. To minimize inductive reactance
• D. All these choices are correct

E2A08

45. Why should effective radiated power (ERP) be limited to a satellite that uses a linear transponder?

• A. To avoid reducing the downlink power to all other users
• B. To avoid interfering with terrestrial QSOs
• C. To prevent creating errors in the satellite telemetry
• D. To prevent the satellite from emitting out-of-band signals

E7H03

46. What is a phase-locked loop?

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

E3B01

47. Where is transequatorial propagation (TEP) most likely to occur?

• A. Between points located 1,500 miles to 2,000 miles apart on the geomagnetic equator
• B. Through the region where the terminator crosses the geographic equator
• C. Between points located at each other's antipode
• D. Between points separated by 2,000 miles to 3,000 miles over a path perpendicular to the geomagnetic equator

E1C04

48. What is an IARP?

• A. An indication of increased antenna reflected power
• B. The internal amateur radio practices policy of the FCC
• C. A forecast of intermittent aurora radio propagation
• D. A permit that allows US amateurs to operate in certain countries of the Americas

E9G06

49. On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

• A. Impedance axis
• B. Reactance axis
• C. Prime axis
• D. Polar axis

E7A01

50. Which circuit is bistable?

• A. An OR gate
• B. An AND gate
• C. A flip-flop
• D. A bipolar amplifier