Practice Exam

E7B12

1. What type of amplifier circuit is shown in Figure E7-1?

• A. Common collector
• B. Emitter follower
• C. Common emitter
• D. Common base

E7C08

2. Which of the following is most frequently used as a band-pass or notch filter in VHF and UHF transceivers?

• A. A finite impulse response filter
• B. A helical filter
• C. A swinging choke filter
• D. A Sallen-Key filter

E1D01

3. What is the definition of telemetry?

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

E6A01

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

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

E4C04

5. 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 of atmospheric noise to phase noise
• D. The ratio in dB of the noise generated by the receiver to the theoretical minimum noise

E7G11

6. What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3,300 ohms and RF is 47 kilohms?

• A. 7
• B. 14
• C. 0.07
• D. 28

E1A06

7. What is the required transmit frequency of a CW signal for channelized 60 meter operation?

• A. At the highest frequency of the channel
• B. At the lowest frequency of the channel
• C. On any frequency where the signal's sidebands are within the channel
• D. At the center frequency of the channel

E9G05

8. Which of the following is a common use for a Smith chart?

• A. Determine the impedance of a transmission line, given the physical dimensions
• B. Determine the loss/100 feet of a transmission line, given the velocity factor and conductor materials
• C. Determine the gain of an antenna given the physical and electrical parameters
• D. Determine the length and position of an impedance matching stub

E6D01

9. What is piezoelectricity?

• A. The ability of materials to generate voltage when an electromagnetic wave of a certain frequency is applied
• B. A characteristic of materials that generate a voltage when stressed and that flex when a voltage is applied
• C. The ability of materials to generate electromagnetic waves of a certain frequency when 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

E3C05

10. What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?

• A. Westward
• B. Eastward
• C. Southward
• D. Northward

E8A10

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

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

E8D11

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

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

E7D14

13. What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?

• A. Equalize the voltage across each capacitor
• B. All these choices are correct
• C. Discharge the capacitors when voltage is removed
• D. Provide a minimum load on the supply

E9C03

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

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

E2C11

15. How should you generally identify your station when attempting to contact a DX station during a contest or in a pileup?

• A. Send your full call sign and grid square
• B. Send the call sign of the DX station three times, the words "this is," then your call sign three times
• C. Send your full call sign once or twice
• D. Send only the last two letters of your call sign until you make contact

E9E11

16. 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

E6E05

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

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

E7E06

18. Why is de-emphasis used in FM communications receivers?

• A. For compatibility with transmitters using phase modulation
• B. To reduce impulse noise reception
• C. To remove third-order distortion products
• D. For higher efficiency

E1B04

19. What must the control operator of a repeater operating in the 70-centimeter band do if a radiolocation system experiences interference from that repeater?

• A. All these choices are correct
• B. Cease operation or make changes to the repeater that mitigate the interference
• C. Reduce the repeater antenna HAAT (Height Above Average Terrain)
• D. File an FAA NOTAM (Notice to Air Missions) with the repeater system's ERP, call sign, and six-character grid locator

E3A10

20. What determines the speed of electromagnetic waves through a medium?

• A. The index of refraction
• B. Resistance and reactance
• C. Evanescence
• D. Birefringence

E0A01

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

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

E2E02

22. Which of the following synchronizes WSJT-X digital mode transmit/receive timing?

• A. Alignment of frequency shifts
• B. Sync-pulse timing
• C. Synchronization of computer clocks
• D. Sync-field transmission

E5B03

23. How is impedance in polar form converted to an equivalent admittance?

• A. Square the magnitude and subtract 90 degrees from the angle
• B. Take the reciprocal of the magnitude and change the sign of the angle
• C. Take the reciprocal of the angle and change the sign of the magnitude
• D. Take the square root of the magnitude and add 180 degrees to the angle

E9H06

24. What indicates the correct value of terminating resistance for a Beverage antenna?

• A. Maximum feed point DC resistance at the center of the desired frequency range
• B. Minimum variation in SWR over the desired frequency range
• C. Maximum DC current in the terminating resistor
• D. Minimum low-angle front-to-back ratio at the design frequency

E4E08

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

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

E1E06

26. Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?

• A. Each administering VE
• B. The VEC coordinating the session
• C. The designated monitoring VE
• D. Only the VE session manager

E8B04

27. What is the modulation index of an FM phone signal having a maximum carrier deviation of plus or minus 6 kHz if the highest modulating frequency is 2 kHz?

• A. 6
• B. 3
• C. 0.6
• D. 0.3

E7A09

28. What logical operation is performed by a two-input exclusive NOR gate?

• A. It produces a 0 at its output if one and only one of its inputs is 1
• B. It produces a 1 at its output if one and only one input is 1
• C. It produces a 1 at its output only if all inputs are 1
• D. It produces a 0 at its output only if all inputs are 0

E1F02

29. What privileges are authorized in the US to persons holding an amateur service license granted by the government of Canada?

• A. The operating terms and conditions of the Canadian amateur service license, not to exceed US Amateur Extra class license privileges
• B. Full privileges, up to and including those of the Amateur Extra class license, on the 80-, 40-, 20-, 15-, and 10-meter bands
• C. Full privileges of the General class license on the 80-, 40-, 20-, 15-, and 10-meter bands
• D. None, they must obtain a US license

E5C06

30. What does the impedance 50 - j25 ohms represent?

• A. 25 ohms resistance in series with 50 ohms inductive reactance
• B. 50 ohms resistance in series with 25 ohms capacitive reactance
• C. 25 ohms resistance in series with 50 ohms capacitive reactance
• D. 50 ohms resistance in series with 25 ohms inductive reactance

E6B08

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

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

E3B09

32. At what time of year is sporadic-E propagation most likely to occur?

• A. Around the solstices, especially the winter solstice
• B. Around the solstices, especially the summer solstice
• C. Around the equinoxes, especially the fall equinox
• D. Around the equinoxes, especially the spring equinox

E9A03

33. What term describing total radiated power takes into account all gains and losses?

• A. Power factor
• B. Half-power bandwidth
• C. Effective radiated power
• D. Apparent power

E6C08

34. In Figure E6-3, which is the schematic symbol for a NAND gate?

• A. 4
• B. 3
• C. 2
• D. 1

E4A02

35. Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?

• A. Signal amplitude and frequency
• B. Signal amplitude and time
• C. SWR and frequency
• D. SWR and time

E9D08

36. What happens as the Q of an antenna increases?

• A. SWR bandwidth decreases
• B. Gain is reduced
• C. More common-mode current is present on the feed line
• D. SWR bandwidth increases

E6F04

37. What is the photovoltaic effect?

• A. The effect that causes a photodiode to emit light when a voltage is applied
• B. The conversion of light to electrical energy
• C. The effect that causes a phototransistor's beta to decrease when exposed to light
• D. The conversion of voltage to current when exposed to light

E7H11

38. What are the major spectral impurity components of direct digital synthesizers?

• A. Harmonics of the local oscillator
• B. Broadband noise
• C. Spurious signals at discrete frequencies
• D. Digital conversion noise

E7F07

39. What function is performed by a Fast Fourier Transform?

• A. Converting signals from the frequency domain to the time domain
• B. Converting digital signals to analog form
• C. Converting analog signals to digital form
• D. Converting signals from the time domain to the frequency domain

E2D09

40. What type of modulation is used by JT65?

• A. RTTY
• B. QAM
• C. PSK
• D. Multitone AFSK

E2A08

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

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

E4B02

42. What is the significance of voltmeter sensitivity expressed in ohms per volt?

• A. The reading in volts multiplied by the ohms per volt rating will determine the power drawn by the device under test
• B. The full scale reading of the voltmeter multiplied by its ohms per volt rating is the input impedance of the voltmeter
• C. The reading in ohms divided by the ohms per volt rating will determine the voltage applied to the circuit
• D. The full scale reading in amps divided by ohms per volt rating will determine the size of shunt needed

E5D01

43. What is the result of conductor skin effect?

• A. Resistance increases as temperature increases because of the change in thermal coefficient
• B. Resistance decreases as frequency increases because electron mobility increases
• C. Resistance increases as frequency increases because RF current flows closer to the surface
• D. Resistance decreases as temperature increases because of the change in thermal coefficient

E9F11

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

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

E8C06

45. What is the bandwidth of an FT8 signal?

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

E1C03

46. How long must an operator wait after filing a notification with the Utilities Technology Council (UTC) before operating on the 2200-meter or 630-meter band?

• A. Operators must not operate until approval is received
• B. Operators may not operate until a test signal has been transmitted in coordination with the local power company
• C. Operators may operate after 30 days, providing they have not been told that their station is within 1 kilometer of PLC systems using those frequencies
• D. Operations may commence immediately, and may continue unless interference is reported by the UTC

E9B09

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

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

E5A05

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

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

E4D13

49. 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. -51 dBm
• C. -57 dBm
• D. -54 dBm

E2B04

50. How is color information sent in analog SSTV?

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