Practice Exam

E2D10

1. What does the packet path WIDE3-1 designate?

• A. Three stations are allowed on frequency, one transmitting at a time
• B. Three digipeater hops are requested with one remaining
• C. Three subcarriers are permitted, subcarrier one is being used
• D. Three internet gateway stations may receive one transmission

E2A01

2. What is the direction of an ascending pass for an amateur satellite?

• A. From north to south
• B. From south to north
• C. From west to east
• D. From east to west

E9D05

3. Approximately how long is a Yagi's driven element?

• A. 1005 divided by frequency in MHz
• B. 234 divided by frequency in MHz
• C. 1/2 wavelength
• D. 1/4 wavelength

E2C05

4. What is the function of a DX QSL Manager?

• A. Handle the receiving and sending of confirmations for a DX station
• B. Allocate frequencies for DXpeditions
• C. Run a net to allow many stations to contact a rare DX station
• D. Communicate to a DXpedition about propagation, band openings, pileup conditions, etc.

E5C01

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

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

E1E10

6. 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

E1D09

7. Which UHF amateur bands have frequencies authorized for space stations?

• A. 70 centimeters and 13 centimeters
• B. 70 centimeters only
• C. 33 centimeters and 13 centimeters
• D. 70 centimeters and 33 centimeters

E1A01

8. Why is it not legal to transmit a 3 kHz bandwidth USB signal with a carrier frequency of 14.348 MHz?

• A. USB is not used on 20-meter phone
• B. The lower 1 kHz of the signal is outside the 20-meter band
• C. The upper 1 kHz of the signal is outside the 20-meter band
• D. 14.348 MHz is outside the 20-meter band

E6F06

9. Which of these materials is most commonly used to create photoconductive devices?

• A. Polyphenol acetate
• B. Argon
• C. All these choices are correct
• D. Crystalline semiconductor

E9C13

10. How does the radiation pattern of a horizontally polarized antenna vary with increasing height above ground?

• A. The takeoff angle of the lowest elevation lobe decreases
• B. The takeoff angle of the lowest elevation lobe increases
• C. The horizontal beamwidth increases
• D. The horizontal beamwidth decreases

E8D07

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

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

E9B01

12. What is the 3 dB beamwidth of the antenna radiation pattern shown in Figure E9-1?

• A. 25 degrees
• B. 75 degrees
• C. 50 degrees
• D. 30 degrees

E4D02

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

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

E0A03

14. Over what range of frequencies are the FCC human body RF exposure limits most restrictive?

• A. 300 kHz - 3 MHz
• B. 30 - 300 MHz
• C. 300 - 3000 MHz
• D. 3 - 30 MHz

E3C07

15. Which of the following indicates the greatest solar flare intensity?

• A. Class A
• B. Class X
• C. Class M
• D. Class Z

E7H03

16. What is a phase-locked loop?

• A. An electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
• B. An electronic circuit also known as a monostable multivibrator
• 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

E5A11

17. 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. 157.8 Hz
• B. 47.3 kHz
• C. 315.6 Hz
• D. 23.67 kHz

E9G07

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

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

E8C05

19. What is the approximate bandwidth of a 13-WPM International Morse Code transmission?

• A. 52 Hz
• B. 13 Hz
• C. 26 Hz
• D. 104 Hz

E1C02

20. Which of the following apply to communications transmitted to amateur stations in foreign countries?

• A. All transmissions must be in English
• B. Communications must be limited to those incidental to the purpose of the amateur service and remarks of a personal nature
• C. Third party traffic must be limited to that intended for the exclusive use of government and non-Government Organization (NGOs) involved in emergency relief activities
• D. All these choices are correct

E9H05

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

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

E4E02

22. Which of the following types of noise can often be reduced by a digital noise reduction?

• A. All these choices are correct
• B. Broadband white noise
• C. Power line noise
• D. Ignition noise

E9A04

23. Which of the following factors affect the feed point impedance of an antenna?

• A. The settings of an antenna tuner at the transmitter
• B. The input power level
• C. Antenna height
• D. Transmission line length

E2E10

24. Which of these digital modes has the narrowest bandwidth?

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

E4C11

25. Why does input attenuation reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?

• A. Signals are attenuated separately from the noise
• B. The attenuator has a low-pass filter to increase the strength of lower frequency signals
• C. Atmospheric noise is generally greater than internally generated noise even after attenuation
• D. The attenuator has a noise filter to suppress interference

E5B06

26. What is susceptance?

• A. The imaginary part of admittance
• B. A measure of the efficiency of a transformer
• C. The magnetic impedance of a circuit
• D. The ratio of magnetic field to electric field

E5D02

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

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

E8A03

28. Which of the following describes a signal in the time domain?

• A. Amplitude at different times
• B. Power at intervals of phase
• C. Frequency at different times
• D. Discrete impulses in time order

E7D02

29. How does a switchmode voltage regulator work?

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

E7E11

30. Which type of detector is used for demodulating SSB signals?

• A. Product detector
• B. Phase comparator
• C. Phase detector
• D. Discriminator

E7A06

31. What is a characteristic of a monostable multivibrator?

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

E6D03

32. Which of the following is an aspect of the piezoelectric effect?

• A. Mechanical deformation of material due to the application of a magnetic field
• B. Increased conductivity in the presence of light
• C. Mechanical deformation of material due to the application of a voltage
• D. Generation of electrical energy in the presence of light

E6C09

33. What is used to design the configuration of a field-programmable gate array (FPGA)?

• A. Machine and assembly language
• B. Karnaugh maps
• C. Hardware description language (HDL)
• D. An auto-router

E3A01

34. What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?

• A. 5,000 miles, if the moon is at perigee
• B. 2,000 miles, if the moon is at perigee
• C. 12,000 miles, if the moon is "visible" by both stations
• D. 2,000 miles, if the moon is at apogee

E6E05

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

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

E6A07

36. Which of the following indicates that a silicon NPN junction transistor is biased on?

• A. Base-to-emitter resistance of approximately 0.6 ohms to 0.7 ohms
• B. Base-to-emitter voltage of approximately 0.6 volts to 0.7 volts
• C. Base-to-emitter voltage of approximately 6 volts to 7 volts
• D. Base-to-emitter resistance of approximately 6 ohms to 7 ohms

E7B03

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

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

E1B11

38. What does PRB-1 require of state and local regulations affecting amateur radio antenna size and structures?

• A. No limitations may be placed on antenna size or placement
• B. Such structures must be permitted when use for emergency communications can be demonstrated
• C. Such structures must be permitted if certified by a registered professional engineer
• D. Reasonable accommodations of amateur radio must be made

E7F02

39. What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?

• A. A Hilbert-transform filter
• B. An adaptive filter
• C. A phase-inverting filter
• D. A crystal-lattice filter

E9F04

40. What impedance does a 1/2-wavelength transmission line present to an RF generator when the line is shorted at the far end?

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

E9E09

41. Which of the following is used to shunt feed a grounded tower at its base?

• A. Gamma match
• B. Double-bazooka match
• C. All these choices are correct
• D. Beta or hairpin match

E2B01

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

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

E3B11

43. At what time of day is sporadic-E propagation most likely to occur?

• A. Between sunset and sunrise
• B. Between sunset and midnight
• C. Between midnight and sunrise
• D. Between sunrise and sunset

E8B04

44. 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. 0.6
• B. 6
• C. 0.3
• D. 3

E7C04

45. How does an impedance-matching circuit transform a complex impedance to a resistive impedance?

• A. It introduces negative resistance to cancel the resistive part of impedance
• B. It introduces transconductance to cancel the reactive part of impedance
• C. It cancels the reactive part of the impedance and changes the resistive part to the desired value
• D. Reactive currents are dissipated in matched resistances

E6B04

46. What type of semiconductor device is designed for use as a voltage-controlled capacitor?

• A. Zener diode
• B. Silicon-controlled rectifier
• C. Varactor diode
• D. Tunnel diode

E4A06

47. What is the effect of aliasing on a digital oscilloscope when displaying a waveform?

• A. A false, jittery low-frequency version of the waveform is displayed
• B. Calibration of the vertical scale is no longer valid
• C. The waveform DC offset will be inaccurate
• D. Excessive blanking occurs, which prevents display of the waveform

E1F11

48. 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 produce full legal output when driven by not more than 5 watts of mean RF input power
• C. It must have received an Underwriters Laboratory certification for electrical safety as well as having met IEEE standard 14.101(B)
• D. It must exhibit a gain of less than 23 dB when driven by 10 watts or less

E4B02

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

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

E7G10

50. What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 1,800 ohms and RF is 68 kilohms?

• A. 38
• B. 1
• C. 0.03
• D. 76