Practice Exam

E7B03

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

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

E9E03

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

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

E9H02

3. Which is generally true for 160- and 80-meter receiving antennas?

• A. All these choices are correct
• B. They must be erected at least 1/2 wavelength above the ground to attain good directivity
• C. Atmospheric noise is so high that directivity is much more important than losses
• D. Low loss coax transmission line is essential for good performance

E5D12

4. What is reactive power?

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

E6A06

5. What is the beta of a bipolar junction transistor?

• A. The frequency at which the current gain is reduced to 0.707
• B. The breakdown voltage of the base-to-collector junction
• C. The change in collector current with respect to the change in base current
• D. The switching speed

E9B01

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

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

E4E10

7. Which of the following can create intermittent loud roaring or buzzing AC line interference?

• A. All these choices are correct
• B. Arcing contacts in a thermostatically controlled device
• C. A defective doorbell or doorbell transformer inside a nearby residence
• D. A malfunctioning illuminated advertising display

E7A05

8. 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

E1E09

9. What may be the penalty for a VE who fraudulently administers or certifies an examination?

• A. A fine of up to $1,000 per occurrence
• B. Revocation of the VE's amateur station license grant and the suspension of the VE's amateur operator license grant
• C. A sentence of up to one year in prison
• D. All these choices are correct

E6E09

10. Which of the following component package types have the least parasitic effects at frequencies above the HF range?

• A. Axial lead
• B. Surface mount
• C. Radial lead
• D. TO-220

E5B10

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

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

E9A12

12. How much gain does an antenna have compared to a half-wavelength dipole if it has 6 dB gain over an isotropic radiator?

• A. 6.0 dB
• B. 2.79 dB
• C. 8.15 dB
• D. 3.85 dB

E5C04

13. What type of Y-axis scale is most often used for graphs of circuit frequency response?

• A. Linear
• B. Scatter
• C. Random
• D. Logarithmic

E2C03

14. From which of the following bands is amateur radio contesting generally excluded?

• A. 6 meters
• B. 70 centimeters
• C. 33 centimeters
• D. 30 meters

E9C07

15. What is the approximate feed point impedance at the center of a two-wire half-wave folded dipole antenna?

• A. 300 ohms
• B. 450 ohms
• C. 50 ohms
• D. 72 ohms

E2D10

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

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

E7F01

17. What is meant by "direct sampling" in software defined radios?

• A. A switching mixer is used to generate I and Q signals directly from the RF input
• B. Software is converted from source code to object code during operation of the receiver
• C. I and Q signals are generated by digital processing without the use of RF amplification
• D. Incoming RF is digitized by an analog-to-digital converter without being mixed with a local oscillator signal

E2A09

18. What do the terms "L band" and "S band" specify?

• A. The 2-meter and 70-centimeter bands
• B. FM and digital store-and-forward systems
• C. Which sideband to use
• D. The 23- and 13-centimeter bands

E7C03

19. What is the purpose of adding an inductor to a Pi-network to create a Pi-L-network?

• A. To eliminate one capacitor
• B. Higher efficiency
• C. Greater transformation range
• D. Greater harmonic suppression

E8D05

20. What is the most common method of reducing key clicks?

• A. Insert high-pass filters at the transmitter output
• B. Increase keying waveform rise and fall times
• C. Reduce keying waveform rise and fall times
• D. Insert low-pass filters at the transmitter output

E7E02

21. What is the function of a reactance modulator?

• A. Produce AM signals by varying an inductance
• B. Produce AM signals by varying a resistance
• C. Produce PM or FM signals by varying a resistance
• D. Produce PM or FM signals by varying a capacitance

E4D01

22. What is meant by the blocking dynamic range of a receiver?

• A. The difference in dB between the noise floor and the level of an incoming signal that will cause 1 dB of gain compression
• B. The minimum difference in dB between two signals which produce third-order intermodulation products greater than the noise floor
• C. The minimum difference in dB between the levels of two FM signals that will cause one signal to block the other
• D. The difference in dB between the noise floor and the third-order intercept point

E3C07

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

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

E1B05

24. What is the National Radio Quiet Zone?

• A. An area in Florida surrounding Cape Canaveral
• B. An area surrounding the FCC monitoring station in Laurel, Maryland
• C. An area surrounding the National Radio Astronomy Observatory
• D. An area in New Mexico surrounding the White Sands Test Area

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

E4B06

26. 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. 75 watts
• B. 125 watts
• C. 112.5 watts
• D. 100 watts

E1D05

27. What must be posted at the location of a station being operated by telecommand on or within 50 kilometers of the Earth's surface?

• A. A label with the name, address, and telephone number of the control operator
• B. All these choices are correct
• C. A label with the name, address, and telephone number of the station licensee
• D. A photocopy of the station license

E6B11

28. What is used to control the attenuation of RF signals by a PIN diode?

• A. Forward DC bias current
• B. Reverse voltage larger than the RF signal
• C. A variable RF reference voltage
• D. Capacitance of an RF coupling capacitor

E9D09

29. What is the function of a loading coil in an electrically short antenna?

• A. To increase the SWR bandwidth by increasing net reactance
• B. To lower the losses
• C. To lower the Q
• D. To resonate the antenna by cancelling the capacitive reactance

E3A05

30. How are the component fields of an electromagnetic wave oriented?

• A. They are at right angles
• B. They are parallel
• C. They are 90 degrees out of phase
• D. They are tangential

E2E04

31. Which of the following is characteristic of the FST4 mode?

• A. All these choices are correct
• B. Variable transmit/receive periods
• C. Seven different tone spacings
• D. Four-tone Gaussian frequency shift keying

E7H08

32. Which of the following components can be used to reduce thermal drift in crystal oscillators?

• A. Non-inductive resistors
• B. NP0 capacitors
• C. Wirewound resistors
• D. Toroidal inductors

E6D05

33. How do ferrite and powdered iron compare for use in an inductor core?

• A. Ferrite cores generally have lower initial permeability
• B. Ferrite cores generally require fewer turns to produce a given inductance value
• C. Ferrite cores generally have better temperature stability
• D. Ferrite cores are easier to use with surface-mount technology

E9G02

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

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

E8B07

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

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

E3B12

36. What is chordal-hop propagation?

• A. Propagation away from the great circle bearing between stations
• B. Propagation across the geomagnetic equator
• C. Signals reflected back toward the transmitting station
• D. Successive ionospheric refractions without an intermediate reflection from the ground

E8C01

37. What is Quadrature Amplitude Modulation or QAM?

• A. A method of performing single sideband modulation by shifting the phase of the carrier and modulation components of the signal
• B. A technique for analog modulation of television video signals using phase modulation and compression
• C. Transmission of data by modulating the amplitude of two carriers of the same frequency but 90 degrees out of phase
• D. A technique for digital data compression used in digital television which removes redundancy in the data by comparing bit amplitudes

E5A06

38. What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?

• A. It equals 2 times pi, times the square root of (inductance L multiplied by capacitance C)
• B. It equals 1 divided by the quantity 2 times pi, times the square root of (inductance L multiplied by capacitance C)
• C. It is at a maximum
• D. It is at a minimum

E1A02

39. When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the lowest frequency at which a properly adjusted LSB emission will be totally within the band?

• A. 3 kHz above the lower band edge
• B. 1 kHz above the lower band edge
• C. The exact lower band edge
• D. 300 Hz above the lower band edge

E2B03

40. How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?

• A. By scanning two fields simultaneously
• B. By scanning odd-numbered lines in one field and even-numbered lines in the next
• C. By scanning each field from bottom-to-top
• D. By scanning lines from left-to-right in one field and right-to-left in the next

E1C04

41. What is an IARP?

• A. An indication of increased antenna reflected power
• B. The internal amateur radio practices policy of the FCC
• C. A forecast of intermittent aurora radio propagation
• D. A permit that allows US amateurs to operate in certain countries of the Americas

E4A11

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

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

E1F10

43. Who may be the control operator of an auxiliary station?

• A. Only Amateur Extra class operators
• B. Any licensed amateur operator
• C. Only General, Advanced, or Amateur Extra class operators
• D. Only Technician, General, Advanced, or Amateur Extra class operators

E8A03

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

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

E7D10

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

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

E0A03

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

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

E6F07

47. What is a solid-state relay?

• A. A semiconductor switch that uses a monostable multivibrator circuit
• B. A device that uses semiconductors to implement the functions of an electromechanical relay
• C. A relay that uses transistors to drive the relay coil
• D. A mechanical relay that latches in the on or off state each time it is pulsed

E9F01

48. What is the velocity factor of a transmission line?

• A. The ratio of its characteristic impedance to its termination impedance
• B. The velocity of a wave in the transmission line divided by the velocity of light in a vacuum
• C. The ratio of its termination impedance to its characteristic impedance
• D. The velocity of a wave in the transmission line multiplied by the velocity of light in a vacuum

E7G04

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

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

E6C05

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

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