Practice Exam

E9H02

1. Which is generally true for 160- and 80-meter receiving antennas?

• A. Low loss coax transmission line is essential for good performance
• B. They must be erected at least 1/2 wavelength above the ground to attain good directivity
• C. Atmospheric noise is so high that directivity is much more important than losses
• D. All these choices are correct

E8D04

2. What is the primary effect of extremely short rise or fall time on a CW signal?

• A. The generation of RF harmonics
• B. More difficult to copy
• C. More difficult to tune
• D. The generation of key clicks

E7A10

3. What is a truth table?

• A. A list of inputs and corresponding outputs for an op-amp
• B. A diagram showing logic states when the digital gate output is true
• C. A list of inputs and corresponding outputs for a digital device
• D. A table of logic symbols that indicate the logic states of an op-amp

E8B07

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

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

E6A05

5. How does DC input impedance at the gate of a field-effect transistor (FET) compare with that of a bipolar transistor?

• A. They are both low impedance
• B. They are both high impedance
• C. An FET has higher input impedance
• D. An FET has lower input impedance

E3C02

6. What is indicated by a rising A-index or K-index?

• A. An increase in the critical frequency
• B. Increasing disturbance of the geomagnetic field
• C. Decreasing disturbance of the geomagnetic field
• D. Higher levels of solar UV radiation

E0A07

7. What is meant by "100% tie-off" regarding tower safety?

• A. All loose ropes and guys secured to a fixed structure
• B. All tools secured to the climber's harness
• C. All circuit breakers feeding power to the tower must be tied closed with tape, cable, or ties
• D. At least one lanyard attached to the tower at all times

E8A11

8. Which of the following is a measure of the quality of an analog-to-digital converter?

• A. Power factor
• B. Total harmonic distortion
• C. Reciprocal mixing
• D. Peak envelope power

E7B02

9. What is a Class D amplifier?

• A. An amplifier that uses switching technology to achieve high efficiency
• B. An amplifier that uses drift-mode FETs for high efficiency
• C. An amplifier biased to be relatively free from distortion
• D. A low power amplifier that uses a differential amplifier for improved linearity

E7G02

10. What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?

• A. High-pass filter
• B. Band-pass filter
• C. Notch filter
• D. Low-pass filter

E2E01

11. Which of the following types of modulation is used for data emissions below 30 MHz?

• A. FSK
• B. Pulse modulation
• C. Spread spectrum
• D. DTMF tones modulating an FM signal

E4D06

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

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

E3A06

13. What should be done to continue a long-distance contact when the MUF for that path decreases due to darkness?

• A. Switch to a lower frequency HF band
• B. Switch to a higher frequency HF band
• C. Change to an antenna with a higher takeoff angle
• D. Change to an antenna with greater beam width

E1C01

14. What is the maximum bandwidth for a data emission on 60 meters?

• A. 170 Hz
• B. 60 Hz
• C. 2.8 kHz
• D. 1.5 kHz

E6B07

15. What causes a junction diode to fail from excessive current?

• A. Insufficient forward voltage
• B. Charge carrier depletion
• C. Excessive inverse voltage
• D. Excessive junction temperature

E6D10

16. What is a primary advantage of using a toroidal core instead of a solenoidal core in an inductor?

• A. Toroidal cores make it easier to couple the magnetic energy into other components
• B. Toroidal cores confine most of the magnetic field within the core material
• C. Toroidal cores exhibit greater hysteresis
• D. Toroidal cores have lower Q characteristics

E9A05

17. What does the term "ground gain" mean?

• A. The change in signal strength caused by grounding the antenna
• B. An increase in signal strength from ground reflections in the environment of the antenna
• C. To force net gain to 0 dB by grounding part of the antenna
• D. The gain of the antenna with respect to a dipole at ground level

E7F10

18. What aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a direct-sampling software defined radio (SDR)?

• A. Sample rate
• B. Sample width in bits
• C. Integral non-linearity
• D. Differential non-linearity

E9F10

19. What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is shorted at the far end?

• A. An inductive reactance
• B. Zero
• C. The same as the characteristic impedance of the line
• D. A capacitive reactance

E8C03

20. Why should the phase of a PSK signal be changed at the zero crossing of the RF signal?

• A. To improve carrier suppression
• B. To minimize bandwidth
• C. All these choices are correct
• D. To simplify modulation

E1B07

21. To what type of regulations does PRB-1 apply?

• A. Use of wireless devices in vehicles
• B. State and local zoning
• C. FAA tower height limits
• D. Homeowners associations

E7E04

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

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

E9E05

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

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

E6F07

24. 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 device that uses semiconductors to implement the functions of an electromechanical relay
• C. A semiconductor switch that uses a monostable multivibrator circuit
• D. A relay that uses transistors to drive the relay coil

E1A08

25. If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?

• A. The control operators of all the stations in the system
• B. The control operators of all the stations in the system not authenticating the source from which they accept communications
• C. The control operator of the originating station
• D. The control operator of the packet bulletin board station

E2C01

26. What indicator is required to be used by US-licensed operators when operating a station via remote control and the remote transmitter is located in the US?

• A. / followed by the ARRL Section of the remote station
• B. No additional indicator is required
• C. /R# where # is the district of the remote station
• D. / followed by the USPS two-letter abbreviation for the state in which the remote station is located

E2A10

27. What type of satellite appears to stay in one position in the sky?

• A. Geomagnetic
• B. LEO
• C. HEO
• D. Geostationary

E7D05

28. Which of the following types of linear voltage regulator operates by loading the unregulated voltage source?

• A. A series regulator
• B. A constant current source
• C. A shunt regulator
• D. A shunt current source

E1E10

29. What must the administering VEs do after the administration of a successful examination for an amateur operator license?

• A. They must return the documents to the applicant for submission to the FCC according to the FCC instructions
• B. They must collect and submit the documents to the coordinating VEC for grading
• C. They must submit the application document to the coordinating VEC according to the coordinating VEC instructions
• D. They must collect and send the documents directly to the FCC

E6E05

30. Which of the following noise figure values is typical of a low-noise UHF preamplifier?

• A. -20 dBm
• B. -10 dB
• C. 0.5 dB
• D. 44 dBm

E4E09

31. What undesirable effect can occur when using a noise blanker?

• A. Received audio in the speech range might have an echo effect
• B. Strong signals may be distorted and appear to cause spurious emissions
• C. FM signals can no longer be demodulated
• D. The audio frequency bandwidth of the received signal might be compressed

E5C07

32. Where is the impedance of a pure resistance plotted on rectangular coordinates?

• A. On a line through the origin, slanted at 45 degrees
• B. On a horizontal line, offset vertically above the horizontal axis
• C. On the vertical axis
• D. On the horizontal axis

E1D07

33. Which of the following HF amateur bands include allocations for space stations?

• A. Only 10 meters
• B. Satellite operation is permitted on all HF bands
• C. 30 meters, 17 meters, and 10 meters
• D. 40 meters, 20 meters, 15 meters, and 10 meters

E4A05

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

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

E9G07

35. On the Smith chart shown in Figure E9-3, what is the only straight line shown?

• A. The current axis
• B. The voltage axis
• C. The resistance axis
• D. The reactance axis

E9C09

36. 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

E2B04

37. How is color information sent in analog SSTV?

• A. Color lines are sent sequentially
• B. Color is sent in a color burst at the end of each line
• C. Color information is sent on a 2.8 kHz subcarrier
• D. Color is amplitude modulated on the frequency modulated intensity signal

E6C11

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

• A. 2
• B. 5
• C. 6
• D. 4

E5A11

39. 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. 47.3 kHz
• B. 23.67 kHz
• C. 315.6 Hz
• D. 157.8 Hz

E1F07

40. When may an amateur station send a message to a business?

• A. When the pecuniary interest of the amateur or his or her employer is less than $50
• B. When the pecuniary interest of the amateur or his or her employer is less than $25
• C. When neither the amateur nor their employer has a pecuniary interest in the communications
• D. At no time

E5D06

41. What parasitic characteristic creates an inductor's self-resonance?

• A. Coupling
• B. Skin effect
• C. Inter-turn capacitance
• D. Dielectric loss

E5B11

42. What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 75 ohms?

• A. 63 degrees with the voltage leading the current
• B. 27 degrees with the voltage leading the current
• C. 63 degrees with the voltage lagging the current
• D. 27 degrees with the voltage lagging the current

E3B03

43. At what time of day is transequatorial propagation most likely to occur?

• A. Late at night
• B. Morning
• C. Afternoon or early evening
• D. Noon

E9D12

44. What is the purpose of making a Yagi's parasitic elements either longer or shorter than resonance?

• A. Minimize losses
• B. Wind torque cancellation
• C. Control of phase shift
• D. Mechanical balance

E4B03

45. Which S parameter is equivalent to forward gain?

• A. S11
• B. S21
• C. S22
• D. S12

E2D07

46. What digital protocol is used by APRS?

• A. QAM
• B. AMTOR
• C. AX.25
• D. PACTOR

E4C07

47. What does the MDS of a receiver represent?

• A. The minimum discernible signal
• B. The maximum detectable spectrum
• C. The meter display sensitivity
• D. The modulation distortion specification

E9B11

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

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

E7C01

49. How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

• A. A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between the input and output
• B. Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
• C. Two capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground
• D. An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output

E7H03

50. 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 circuit consisting of a precision push-pull amplifier with a differential phase input
• D. An electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator