Practice Exam

E4E06

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

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

E9B05

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

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

E7F11

3. What sets the minimum detectable signal level for a direct-sampling software defined receiver in the absence of atmospheric or thermal noise?

• A. Reference voltage level and sample width in bits
• B. Missing codes and jitter
• C. Data storage transfer rate
• D. Sample clock phase noise

E6E11

4. What is a characteristic of DIP packaging used for integrated circuits?

• A. Extremely low stray capacitance (dielectrically isolated package)
• B. Two rows of connecting pins on opposite sides of package (dual in-line package)
• C. Two chips in each package (dual in package)
• D. Extremely high resistance between pins (doubly insulated package)

E8D09

5. What is considered an acceptable maximum IMD level for an idling PSK signal?

• A. +15 dB
• B. +5 dB
• C. +10 dB
• D. -30 dB

E9A07

6. What is the effective isotropic radiated power (EIRP) of a repeater station with 200 watts transmitter power output, 2 dB feed line loss, 2.8 dB duplexer loss, 1.2 dB circulator loss, and 7 dBi antenna gain?

• A. 63.2 watts
• B. 632 watts
• C. 252 watts
• D. 159 watts

E9G02

7. What type of coordinate system is used in a Smith chart?

• A. Resistance circles and reactance arcs
• B. Voltage circles and current arcs
• C. Voltage chords and current chords
• D. Resistance lines and reactance chords

E7B03

8. 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 filter to remove harmonic content
• D. A temperature compensating load resistor to improve linearity

E4A01

9. Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?

• A. Analog-to-digital converter reference frequency
• B. Sampling rate of the analog-to-digital converter
• C. Q of the circuit
• D. All these choices are correct

E5D10

10. As a conductor's diameter increases, what is the effect on its electrical length?

• A. Thickness has no effect on electrical length
• B. It decreases
• C. It increases
• D. It varies randomly

E8C08

11. How does ARQ accomplish error correction?

• A. Special polynomial codes provide automatic correction
• B. If errors are detected, redundant data is substituted
• C. If errors are detected, a retransmission is requested
• D. Special binary codes provide automatic correction

E2E08

12. Which of the following HF digital modes can be used to transfer binary files?

• A. PSK31
• B. AMTOR
• C. PACTOR
• D. RTTY

E6B08

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

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

E1E08

14. To which of the following examinees may a VE not administer an examination?

• A. Relatives of the VE as listed in the FCC rules
• B. Friends of the VE
• C. All these choices are correct
• D. Employees of the VE

E9F12

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

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

E7C01

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

E1B10

17. What frequencies are authorized to an amateur station operating under RACES rules?

• A. All these choices are correct
• B. Specific local government channels
• C. All amateur service frequencies authorized to the control operator
• D. Specific segments in the amateur service MF, HF, VHF, and UHF bands

E2C09

18. What type of equipment is commonly used to implement an amateur radio mesh network?

• A. A wireless router running custom firmware
• B. A 440 MHz transceiver with a 9,600-baud modem
• C. A computer running EchoLink to provide interface from the radio to the internet
• D. A 2-meter VHF transceiver with a 1,200-baud modem

E9E09

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

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

E2A01

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

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

E1C02

21. 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. All these choices are correct
• D. 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

E7G06

22. What is the gain-bandwidth of an operational amplifier?

• A. The frequency at which the amplifier's offset voltage is zero
• B. The maximum frequency for a filter circuit using that type of amplifier
• C. The frequency at which the open-loop gain of the amplifier equals one
• D. The gain of the amplifier at a filter's cutoff frequency

E7D09

23. How is battery operating time calculated?

• A. Internal resistance divided by average current
• B. Capacity in amp-hours divided by average current
• C. Average current divided by internal resistance
• D. Average current divided by capacity in amp-hours

E4B06

24. 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. 112.5 watts
• B. 100 watts
• C. 125 watts
• D. 75 watts

E6C01

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

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

E1D06

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

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

E5B02

27. What letter is commonly used to represent susceptance?

• A. Y
• B. B
• C. X
• D. G

E4C13

28. What is reciprocal mixing?

• A. Two digital signals combining from alternate time slots
• B. In-phase signals cancelling in a mixer resulting in loss of receiver sensitivity
• C. Local oscillator phase noise mixing with adjacent strong signals to create interference to desired signals
• D. Two out-of-band signals mixing to generate an in-band spurious signal

E1A01

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

• A. 14.348 MHz is outside the 20-meter band
• 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. USB is not used on 20-meter phone

E7H13

30. Which of the following is a technique for providing highly accurate and stable oscillators needed for microwave transmission and reception?

• A. Use a rubidium stabilized reference oscillator
• B. All these choices are correct
• C. Use a temperature-controlled high Q dielectric resonator
• D. Use a GPS signal reference

E4D13

31. 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. -54 dBm
• B. -51 dBm
• C. -60 dBm
• D. -57 dBm

E1F05

32. 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. 53 MHz - 54 MHz
• C. 222 MHz - 223 MHz
• D. 440 MHz - 450 MHz

E5A11

33. 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. 23.67 kHz
• B. 315.6 Hz
• C. 47.3 kHz
• D. 157.8 Hz

E2D10

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

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

E7A05

35. Which of the following circuits continuously alternates between two states without an external clock signal?

• A. Monostable multivibrator
• B. J-K flip-flop
• C. T flip-flop
• D. Astable multivibrator

E7E11

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

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

E8B07

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

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

E3C02

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

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

E5C08

39. What coordinate system is often used to display the phase angle of a circuit containing resistance, inductive, and/or capacitive reactance?

• A. Faraday grid
• B. Maidenhead grid
• C. Polar coordinates
• D. Elliptical coordinates

E6F06

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

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

E9D01

41. How much does the gain of an ideal parabolic reflector antenna increase when the operating frequency is doubled?

• A. 4 dB
• B. 3 dB
• C. 2 dB
• D. 6 dB

E3A09

42. Which of the following frequency ranges is most suited for meteor-scatter communications?

• A. 220 MHz - 450 MHz
• B. 1.8 MHz - 1.9 MHz
• C. 10 MHz - 14 MHz
• D. 28 MHz - 148 MHz

E9H10

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

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

E9C02

44. What type of radiation pattern is created by two 1/4-wavelength vertical antennas spaced 1/4- wavelength apart and fed 90 degrees out of phase?

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

E6A08

45. What is the term for the frequency at which the grounded-base current gain of a bipolar junction transistor has decreased to 0.7 of the gain obtainable at 1 kHz?

• A. Alpha cutoff frequency
• B. Corner frequency
• C. Alpha rejection frequency
• D. Beta cutoff frequency

E2B01

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

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

E3B07

47. What effect does lowering a signal's transmitted elevation angle have on ionospheric HF skip propagation?

• A. The critical frequency increases
• B. The MUF decreases
• C. Faraday rotation becomes stronger
• D. The distance covered by each hop increases

E0A03

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

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

E6D02

49. What is the equivalent circuit of a quartz crystal?

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

E8A04

50. What is "dither" with respect to analog-to-digital converters?

• A. An abnormal condition where the converter cannot settle on a value to represent the signal
• B. A method of decimation by randomly skipping samples
• C. A small amount of noise added to the input signal to reduce quantization noise
• D. An error caused by irregular quantization step size