Practice Exam

E5A08

1. What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?

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

E4D11

2. Why are odd-order intermodulation products, created within a receiver, of particular interest compared to other products?

• A. Odd-order products are more likely to overload the IF filters
• B. Odd-order products of two signals in the band being received are also likely to be within the band
• C. Odd-order products are an indication of poor image rejection
• D. Odd-order intermodulation produces three products for every input signal within the band of interest

E5C01

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

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

E2E13

4. Which of these digital modes has the highest data throughput under clear communication conditions?

• A. FT8
• B. PACTOR IV
• C. 170 Hz shift, 45 baud RTTY
• D. MFSK16

E6A01

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

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

E9C01

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

E1B04

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

E4A09

8. Which of the following is good practice when using an oscilloscope probe?

• A. Minimize the length of the probe's ground connection
• B. Never use a DC-coupled probe to measure an AC circuit
• C. All these choices are correct
• D. Never use a high-impedance probe to measure a low-impedance circuit

E1D06

9. What is the maximum permitted transmitter output power when operating a model craft by telecommand?

• A. 100 watts
• B. 5 watts
• C. 1 watt
• D. 2 watts

E7F14

10. Which of the following would allow a digital signal processing filter to create a sharper filter response?

• A. More taps
• B. Double-precision math routines
• C. Lower Q
• D. Higher data rate

E3C12

11. Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?

• A. Transequatorial propagation on 6 meters is likely
• B. Long-path propagation on the higher HF bands is likely
• C. A temperature inversion has occurred
• D. A coronal mass ejection impact or a solar flare has occurred

E3B02

12. What is the approximate maximum range for signals using transequatorial propagation?

• A. 5,000 miles
• B. 2,500 miles
• C. 7,500 miles
• D. 1,000 miles

E7A06

13. What is a characteristic of a monostable multivibrator?

• A. It switches temporarily to an alternate state for a set time
• B. It produces a continuous square wave
• C. It maintains a constant output voltage, regardless of variations in the input voltage
• D. It stores one bit of data

E2A06

14. What are Keplerian elements?

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

E9A11

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

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

E8B05

16. What is the deviation ratio of an FM phone signal having a maximum frequency swing of plus or minus 5 kHz if the highest modulation frequency is 3 kHz?

• A. 0.167
• B. 0.6
• C. 1.67
• D. 6

E6C05

17. Which of the following digital logic families has the lowest power consumption?

• A. CMOS
• B. NMOS
• C. Schottky TTL
• D. ECL

E3A12

18. What is most likely to result in auroral propagation?

• A. Severe geomagnetic storms
• B. Meteor showers
• C. Extreme low-pressure areas in polar regions
• D. Quiet geomagnetic conditions

E6D02

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

E7B03

20. What circuit is required at the output of an RF switching amplifier?

• A. A filter to remove harmonic content
• B. A high-pass filter to compensate for low gain at low frequencies
• C. A matched load resistor to prevent damage by switching transients
• D. A temperature compensating load resistor to improve linearity

E9G06

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

E8C12

22. What factors affect the bandwidth of a transmitted CW signal?

• A. IF bandwidth and Q
• B. Keying speed and shape factor (rise and fall time)
• C. Modulation index and output power
• D. All these choices are correct

E8D06

23. What is the advantage of including parity bits in ASCII characters?

• A. Faster transmission rate
• B. Some types of errors can be detected
• C. Signal-to-noise ratio is improved
• D. A larger character set is available

E9F12

24. What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is open at the far end?

• A. Very low impedance
• B. Very high impedance
• C. The same as the input impedance to the generator
• D. The same as the characteristic impedance of the line

E2D09

25. What type of modulation is used by JT65?

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

E9E03

26. What matching system uses a short length of transmission line connected in parallel with the feed line at or near the feed point?

• A. Stub match
• B. T-match
• C. Delta match
• D. Gamma match

E5B10

27. What is the relationship between the AC current through an inductor and the voltage across an inductor?

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

E1E07

28. What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?

• A. Immediately terminate everyone's examination and close the session
• B. Allow the candidate to complete the examination, but invalidate the results
• C. Immediately terminate the candidate's examination
• D. Warn the candidate that continued failure to comply will result in termination of the examination

E9B05

29. What type of antenna pattern is shown in Figure E9-2?

• A. Azimuth
• B. Polarization
• C. Near field
• D. Elevation

E1F05

30. 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. 420 MHz - 430 MHz
• C. 440 MHz - 450 MHz
• D. 222 MHz - 223 MHz

E6B06

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

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

E9D08

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

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

E8A06

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

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

E7G09

34. What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?

• A. -2.3 volts
• B. 2.3 volts
• C. -0.23 volts
• D. 0.23 volts

E1C07

35. What notifications must be given before transmitting on the 630- or 2200-meter bands?

• A. Operators must inform the Utilities Technology Council (UTC) of their call sign and coordinates of the station
• B. Operators must inform the FAA of their intent to operate, giving their call sign and distance to the nearest runway
• C. A special endorsement must be requested from the FCC
• D. An environmental impact statement must be filed with the Department of the Interior

E7E03

36. What is a frequency discriminator?

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

E2B07

37. Which types of modulation are used for amateur television DVB-T signals?

• A. AM and OOK
• B. FM and FSK
• C. QAM and QPSK
• D. All these choices are correct

E5D05

38. What parasitic characteristic causes electrolytic capacitors to be unsuitable for use at RF?

• A. Shunt capacitance
• B. Skin effect
• C. Inductance
• D. Dielectric leakage

E4B08

39. Which of the following can be used to determine the Q of a series-tuned circuit?

• A. The resonant frequency of the circuit
• B. The frequency shift
• C. The bandwidth of the circuit's frequency response
• D. The ratio of inductive reactance to capacitive reactance

E6E05

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

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

E1A04

41. May an Extra class operator answer the CQ of a station on 3.601 MHz LSB phone?

• A. No, the sideband components will extend beyond the edge of the phone band segment
• B. Yes, the entire signal will be inside the SSB allocation for Extra class operators
• C. Yes, the displayed frequency is within the 75-meter phone band segment
• D. No, US stations are not permitted to use phone emissions below 3.610 MHz

E4E06

42. What type of electrical interference can be caused by computer network equipment?

• A. A whining-type noise that continually pulses off and on
• B. A loud AC hum in the audio output of your station's receiver
• C. A clicking noise at intervals of a few seconds
• D. The appearance of unstable modulated or unmodulated signals at specific frequencies

E7C06

43. What are the characteristics of an elliptical filter?

• A. Gradual passband rolloff with minimal stop-band ripple
• B. Extremely sharp cutoff with one or more notches in the stop band
• C. Gradual passband rolloff with extreme stop-band ripple
• D. Extremely flat response over its pass band with gradually rounded stop-band corners

E4C06

44. How much does increasing a receiver's bandwidth from 50 Hz to 1,000 Hz increase the receiver's noise floor?

• A. 5 dB
• B. 13 dB
• C. 3 dB
• D. 10 dB

E9H03

45. What is receiving directivity factor (RDF)?

• A. Peak antenna gain compared to average gain over the hemisphere around and above the antenna
• B. Forward gain compared to the gain in the reverse direction
• C. Relative directivity compared to isotropic
• D. Relative directivity compared to a dipole

E7H12

46. Which of the following ensures that a crystal oscillator operates on the frequency specified by the crystal manufacturer?

• A. Provide the crystal with a specified parallel inductance
• B. Provide the crystal with a specified parallel capacitance
• C. Bias the crystal at a specified voltage
• D. Bias the crystal at a specified current

E6F10

47. What is the most common material used in power-generating photovoltaic cells?

• A. Selenium
• B. Indium arsenide
• C. Silicon
• D. Cadmium sulfide

E0A06

48. Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?

• A. The body reacts to electromagnetic radiation from both the E and H fields
• B. Ground reflections and scattering cause the field strength to vary with location
• C. All these choices are correct
• D. E field and H field radiation intensity peaks can occur at different locations

E2C10

49. Why do DX stations often transmit and receive on different frequencies?

• A. All these choices are correct
• B. To separate the calling stations from the DX station
• C. Because the DX station may be transmitting on a frequency that is prohibited to some responding stations
• D. To improve operating efficiency by reducing interference

E7D02

50. How does a switchmode voltage regulator work?

• A. By varying the duty cycle of pulses input to a filter
• B. By alternating the output between positive and negative voltages
• C. By varying the conductivity of a pass element
• D. By switching between two Zener diode reference voltages