Practice Exam

E9H10

1. How can the output voltage of a multiple-turn receiving loop antenna be increased?

• A. All these choices are correct
• B. By reducing the permeability of the loop shield
• C. By increasing the number of turns and/or the area enclosed by the loop
• D. By utilizing high impedance wire for the coupling loop

E6F02

2. What happens to photoconductive material when light shines on it?

• A. Reflectivity decreases
• B. Resistance decreases
• C. Reflectivity increases
• D. Resistance increases

E9E11

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

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

E2B08

4. What technique allows commercial analog TV receivers to be used for fast-scan TV operations on the 70- centimeter band?

• A. Using converted satellite TV dishes
• B. Using USB and demodulating the signal with a computer sound card
• C. Transmitting on the abandoned TV channel 2
• D. Transmitting on channels shared with cable TV

E9G03

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

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

E5B04

6. What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all in parallel?

• A. 440 seconds
• B. 220 seconds
• C. 110 seconds
• D. 55 seconds

E7B06

7. What is a characteristic of a grounded-grid amplifier?

• A. High electrostatic damage protection
• B. High power gain
• C. Low input impedance
• D. Low bandwidth

E1B01

8. Which of the following constitutes a spurious emission?

• A. Any transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level
• B. A signal transmitted to prevent its detection by any station other than the intended recipient
• C. An amateur station transmission made without the proper call sign identification
• D. An emission outside the signal's necessary bandwidth that can be reduced or eliminated without affecting the information transmitted

E9C01

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

E2A12

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

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

E7F09

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

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

E9B03

12. What is the front-to-side ratio of the antenna radiation pattern shown in Figure E9-1?

• A. 18 dB
• B. 14 dB
• C. 24 dB
• D. 12 dB

E7C07

13. Which describes a Pi-L network?

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

E6E03

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

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

E4B06

15. How much power is being absorbed by the load when a directional power meter connected between a transmitter and a terminating load reads 100 watts forward power and 25 watts reflected power?

• A. 100 watts
• B. 112.5 watts
• C. 125 watts
• D. 75 watts

E2C04

16. 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. The 60-meter band channel centered on 5373 kHz
• D. HF frequencies where digital communications are permitted

E4A11

17. Which of the following can be measured with an antenna analyzer?

• A. All these choices are correct
• B. Velocity factor
• C. Cable length
• D. Resonant frequency of a tuned circuit

E8B03

18. What is the modulation index of an FM phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency if the highest modulating frequency is 1000 Hz?

• A. 6
• B. 3
• C. 0.3
• D. 0.6

E5A05

19. What is the result of increasing the Q of an impedance-matching circuit?

• A. Matching bandwidth is decreased
• B. Harmonics increase
• C. Losses increase
• D. Matching bandwidth is increased

E4E05

20. What is used to suppress radio frequency interference from a line-driven AC motor?

• A. A bypass capacitor in series with the motor's field winding
• B. A high-pass filter in series with the motor's power leads
• C. A bypass choke in parallel with the motor's field winding
• D. A brute-force AC-line filter in series with the motor's power leads

E1A08

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

E6C01

22. What is the function of hysteresis in a comparator?

• A. To allow the comparator to be used with AC input signals
• B. To increase the sensitivity
• C. To prevent input noise from causing unstable output signals
• D. To cause the output to continually change states

E1E01

23. For which types of out-of-pocket expenses do the Part 97 rules state that VEs and VECs may be reimbursed?

• A. Providing amateur operator license examination preparation training materials
• B. Teaching an amateur operator license examination preparation course
• C. No expenses are authorized for reimbursement
• D. Preparing, processing, administering, and coordinating an examination for an amateur radio operator license

E1D01

24. What is the definition of telemetry?

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

E1C01

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

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

E8D11

26. What is one advantage of using ASCII code for data communications?

• A. It uses one character as a shift code to send numeric and special characters
• B. It is possible to transmit both uppercase and lowercase text
• C. It includes built-in error correction features
• D. It contains fewer information bits per character than any other code

E9A01

27. What is an isotropic radiator?

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

E7G04

28. What is meant by the term "op-amp input offset voltage"?

• A. The output voltage of the op-amp minus its input voltage
• B. The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
• C. The potential between the amplifier input terminals of the op-amp in an open loop condition
• D. The differential input voltage needed to bring the open loop output voltage to zero

E7A03

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

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

E4D02

30. Which of the following describes problems caused by poor dynamic range in a receiver?

• A. Spurious signals caused by cross modulation and desensitization from strong adjacent signals
• B. Oscillator instability requiring frequent retuning and loss of ability to recover the opposite sideband
• C. Oscillator instability and severe audio distortion of all but the strongest received signals
• D. Poor weak signal reception caused by insufficient local oscillator injection

E2D05

31. What is the characteristic of the JT65 mode?

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

E6D01

32. What is piezoelectricity?

• A. The ability of materials to generate voltage when an electromagnetic wave of a certain frequency is applied
• B. The ability of materials to generate electromagnetic waves of a certain frequency when voltage is applied
• C. A characteristic of materials that generate a voltage when stressed and that flex when a voltage is applied
• D. A characteristic of materials that have an index of refraction which depends on the polarization of the electromagnetic wave passing through it

E6B08

33. Which of the following is a Schottky barrier diode?

• A. Electrolytic rectifier
• B. PIN junction
• C. Metal-semiconductor junction
• D. Thermionic emission diode

E1F05

34. 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. 420 MHz - 430 MHz
• B. 222 MHz - 223 MHz
• C. 440 MHz - 450 MHz
• D. 53 MHz - 54 MHz

E4C08

35. An SDR receiver is overloaded when input signals exceed what level?

• A. One-half of the maximum sampling buffer size
• B. The reference voltage of the analog-to-digital converter
• C. One-half of the maximum sample rate
• D. The maximum count value of the analog-to-digital converter

E9D12

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

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

E3B10

37. What is the effect of chordal-hop propagation?

• A. The MUF for chordal-hop propagation is much lower than for normal skip propagation
• B. The signal experiences less loss compared to multi-hop propagation, which uses Earth as a reflector
• C. Signals travel faster along ionospheric chords
• D. Atmospheric noise is reduced in the direction of chordal-hop propagation

E7E03

38. What is a frequency discriminator?

• A. An FM generator circuit
• B. An automatic band-switching circuit
• C. A circuit for detecting FM signals
• D. A circuit for filtering closely adjacent signals

E3C01

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

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

E7H01

40. What are three common oscillator circuits?

• A. Pierce, Fenner, and Beane
• B. Colpitts, Hartley, and Pierce
• C. Taft, Pierce, and negative feedback
• D. Taft, Hartley, and Pierce

E3A11

41. What is a typical range for tropospheric duct propagation of microwave signals?

• A. 100 miles to 300 miles
• B. 1,200 miles
• C. 10 miles to 50 miles
• D. 2,500 miles

E9F08

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

E7D10

43. Why is a switching type power supply less expensive and lighter than an equivalent linear power supply?

• A. The inverter design does not require an output filter circuit
• B. The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output
• C. It recovers power from the unused portion of the AC cycle, thus using fewer components
• D. The control circuitry uses less current, therefore smaller heat sinks are required

E6A01

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

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

E2E11

45. What is the difference between direct FSK and audio FSK?

• A. Direct FSK modulates the transmitter VFO
• B. Direct FSK occupies less bandwidth
• C. Direct FSK can transmit higher baud rates
• D. All these choices are correct

E8C15

46. What technique do individual nodes use to form a mesh network?

• A. Acting as store-and-forward digipeaters
• B. Custom code plugs for the local trunking systems
• C. Discovery and link establishment protocols
• D. Forward error correction and Viterbi codes

E0A01

47. What is the primary function of an external earth connection or ground rod?

• A. Protect breaker panel from power surges
• B. Reduce RF current flow between pieces of equipment
• C. Prevent static build up on power lines
• D. Lightning charge dissipation

E5D12

48. What is reactive power?

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

E8A01

49. What technique shows that a square wave is made up of a sine wave and its odd harmonics?

• A. Differential analysis
• B. Fourier analysis
• C. Vector analysis
• D. Numerical analysis

E5C10

50. Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 400-ohm resistor and a 38-picofarad capacitor at 14 MHz?

• A. Point 4
• B. Point 6
• C. Point 5
• D. Point 2