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US Amateur Radio - Amateur Extra (Element 4, 2016-2020) Practice Test

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1. - E1A09

What is the first action you should take if your digital message forwarding station inadvertently forwards a communication that violates FCC rules?

SelectAnswer
ANotify the nearest FCC Field Engineer's office
BNotify the originating station that the communication does not comply with FCC rules
CDiscontinue forwarding all messages
DDiscontinue forwarding the communication as soon as you become aware of it

2. - E1B05

What is the National Radio Quiet Zone?

SelectAnswer
AAn area in Florida surrounding Cape Canaveral
BAn area in New Mexico surrounding the White Sands Test Area
CAn area in Puerto Rico surrounding the Arecibo Radio Telescope
DAn area surrounding the National Radio Astronomy Observatory

3. - E1C10

What types of amateur stations may automatically retransmit the radio signals of other amateur stations?

SelectAnswer
AOnly auxiliary, repeater or space stations
BOnly earth stations, repeater stations or model craft
COnly auxiliary, beacon or space stations
DOnly beacon, repeater or space stations

4. - E1D01

What is the definition of the term telemetry?

SelectAnswer
ATwo-way single channel transmissions of data
BTwo-way radiotelephone transmissions in excess of 1000 feet
COne-way transmission that initiates, modifies, or terminates the functions of a device at a distance
DOne-way transmission of measurements at a distance from the measuring instrument

5. - E1E04

Which of the following best describes the Volunteer Examiner accreditation process?

SelectAnswer
AThe amateur operator applying must pass a VE examination administered by the FCC Enforcement Bureau
BEach General, Advanced and Amateur Extra Class operator is automatically accredited as a VE when the license is granted
CThe procedure by which a VEC confirms that the VE applicant meets FCC requirements to serve as an examiner
DThe prospective VE obtains accreditation from the FCC

6. - E1F04

Which of the following geographic descriptions approximately describes "Line A"?

SelectAnswer
AA line roughly parallel to and south of the U.S.-Canadian border
BA line roughly parallel to and west of the U.S. Atlantic coastline
CA line roughly parallel to and north of the U.S.-Mexican border and Gulf coastline
DA line roughly parallel to and east of the U.S. Pacific coastline

7. - E2A12

What is one way to predict the location of a satellite at a given time?

SelectAnswer
ABy calculations using the Keplerian elements for the specified satellite
BBy adding the mean anomaly to the orbital inclination
CBy subtracting the mean anomaly from the orbital inclination
DBy means of the Doppler data for the specified satellite

8. - E2B06

What is vestigial sideband modulation?

SelectAnswer
AAmplitude modulation in which one complete sideband and a portion of the other are transmitted
BNarrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
CSpread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation
DA type of modulation in which one sideband is inverted

9. - E2C06

During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?

SelectAnswer
AIn the middle of each band, usually on the national calling frequency
BIn the weak signal segment of the band, with most of the activity near the calling frequency
CIn the middle of the band, usually 25 kHz above the national calling frequency
DAt the top of each band, usually in a segment reserved for contests

10. - E2D14

What is one advantage of using JT65 coding?

SelectAnswer
AEasily copied by ear if necessary
BThe ability to decode signals which have a very low signal to noise ratio
CPermits fast-scan TV transmissions over narrow bandwidth
DUses only a 65 Hz bandwidth

11. - E2E07

What is the typical bandwidth of a properly modulated MFSK16 signal?

SelectAnswer
A550 Hz
B316 Hz
C31 Hz
D2.16 kHz

12. - E3A02

What characterizes libration fading of an EME signal?

SelectAnswer
AA slow change in the pitch of the CW signal
BA fluttery irregular fading
CA gradual loss of signal as the Sun rises
DThe returning echo is several Hertz lower in frequency than the transmitted signal

13. - E3B13

Why is chordal hop propagation desirable?

SelectAnswer
AThe MUF for chordal hop propagation is much lower than for normal skip propagation
BThe signal experiences less loss along the path compared to normal skip propagation
CSignals travel faster along ionospheric chords
DAtmospheric noise is lower in the direction of chordal hop propagation

14. - E3C02

What is indicated by a rising A or K index?

SelectAnswer
ADecreasing disruption of the geomagnetic field
BAn increase in the critical frequency
CIncreasing disruption of the geomagnetic field
DHigher levels of solar UV radiation

15. - E4A02

Which of the following parameters would a spectrum analyzer display on the vertical and horizontal axes?

SelectAnswer
ARF amplitude and frequency
BRF amplitude and time
CSWR and time
DSWR and frequency

16. - E4B15

Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?

SelectAnswer
AThe inductance to capacitance ratio
BThe frequency shift
CThe bandwidth of the circuit's frequency response
DThe resonant frequency of the circuit

17. - E4C03

What is the term for the blocking of one FM phone signal by another, stronger FM phone signal?

SelectAnswer
ACross-modulation interference
BDesensitization
CFrequency discrimination
DCapture effect

18. - E4D03

How can intermodulation interference between two repeaters occur?

SelectAnswer
AWhen the signals from the transmitters are reflected in phase from airplanes passing overhead
BWhen the repeaters are in close proximity and the signals mix in the final amplifier of one or both transmitters
CWhen the repeaters are in close proximity and the signals cause feedback in the final amplifier of one or both transmitters
DWhen the signals from the transmitters are reflected out of phase from airplanes passing overhead

19. - E4E09

What undesirable effect can occur when using an IF noise blanker?

SelectAnswer
ANearby signals may appear to be excessively wide even if they meet emission standards
BFM signals can no longer be demodulated
CThe audio frequency bandwidth of the received signal might be compressed
DReceived audio in the speech range might have an echo effect

20. - E5A03

What is the magnitude of the impedance of a series RLC circuit at resonance?

SelectAnswer
AApproximately equal to inductive reactance
BApproximately equal to circuit resistance
CApproximately equal to capacitive reactance
DHigh, as compared to the circuit resistance

21. - E5B04

What is the time constant of a circuit having two 220 microfarad capacitors and two 1 megohm resistors, all in parallel?

SelectAnswer
A110 seconds
B220 seconds
C55 seconds
D440 seconds

22. - E5C08

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

SelectAnswer
APolar coordinates
BElliptical coordinates
CMaidenhead grid
DFaraday grid

23. - E5D08

What type of energy is stored in an electromagnetic or electrostatic field?

SelectAnswer
AKinetic energy
BElectromechanical energy
CThermodynamic energy
DPotential energy

24. - E6A10

In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?

SelectAnswer
A6
B2
C4
D5

25. - E6B08

Which of the following describes a type of semiconductor diode?

SelectAnswer
AElectrolytic rectifier
BMetal-semiconductor junction
CCMOS-field effect
DThermionic emission diode

26. - E6C12

What is BiCMOS logic?

SelectAnswer
AA logic device with two CMOS circuits per package
BA FET logic family based on bimetallic semiconductors
CA logic family based on bismuth CMOS devices
DAn integrated circuit logic family using both bipolar and CMOS transistors

27. - E6D09

What devices are commonly used as VHF and UHF parasitic suppressors at the input and output terminals of a transistor HF amplifier?

SelectAnswer
AElectrolytic capacitors
BFerrite beads
CButterworth filters
DSteel-core toroids

28. - E6E08

How is voltage from a power supply normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?

SelectAnswer
AMMICs require no operating bias
BDirectly to the bias voltage (VCC IN) lead
CThrough a capacitor and RF choke connected to the amplifier input lead
DThrough a resistor and/or RF choke connected to the amplifier output lead

29. - E6F12

What absorbs the energy from light falling on a photovoltaic cell?

SelectAnswer
APhotons
BHoles
CElectrons
DProtons

30. - E7A11

What type of logic defines "1" as a high voltage?

SelectAnswer
ANegative logic
BAssertive Logic
CPositive Logic
DReverse Logic

31. - E7B07

Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?

SelectAnswer
ASignal distortion and excessive bandwidth
BReduced intermodulation products
CSignal inversion
DIncreased overall intelligibility

32. - E7C13

What is one advantage of a Pi-matching network over an L-matching network consisting of a single inductor and a single capacitor?

SelectAnswer
AL-networks cannot perform impedance transformation
BPi-networks are designed for balanced input and output
CThe Q of Pi-networks can be varied depending on the component values chosen
DPi-networks have fewer components

33. - E7D02

What is one characteristic of a switching electronic voltage regulator?

SelectAnswer
AThe resistance of a control element is varied in direct proportion to the line voltage or load current
BThe controlled device's duty cycle is changed to produce a constant average output voltage
CIt is generally less efficient than a linear regulator
DIt gives a ramp voltage at its output

34. - E7E09

What occurs when an excessive amount of signal energy reaches a mixer circuit?

SelectAnswer
AMixer blanking occurs
BSpurious mixer products are generated
CAutomatic limiting occurs
DA beat frequency is generated

35. - E7F05

How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?

SelectAnswer
AAt four times the rate of the highest frequency component of the signal
BAt half the rate of the highest frequency component of the signal
CAt the same rate as the highest frequency component of the signal
DAt twice the rate of the highest frequency component of the signal

36. - E7G08

How does the gain of an ideal operational amplifier vary with frequency?

SelectAnswer
AIt decreases linearly with increasing frequency
BIt increases linearly with increasing frequency
CIt does not vary with frequency
DIt decreases logarithmically with increasing frequency

37. - E7H07

How can an oscillator's microphonic responses be reduced?

SelectAnswer
AMechanically isolating the oscillator circuitry from its enclosure
BUse of NP0 capacitors
CEliminating noise on the oscillator's power supply
DUsing the oscillator only for CW and digital signals

38. - E8A11

What type of information can be conveyed using digital waveforms?

SelectAnswer
AVideo signals
BAll of these choices are correct
CData
DHuman speech

39. - E8B04

What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2 kHz modulating frequency?

SelectAnswer
A3
B1/3
C2000
D6000

40. - E8C10

What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits

SelectAnswer
AIt has more possible states than simple binary
BIt facilitates error detection
CIt increases security
DIt has more resolution than simple binary

41. - E8D08

What parameter might indicate that excessively high input levels are causing distortion in an AFSK signal?

SelectAnswer
ARepeat Request Rate (RRR)
BSignal to noise ratio
CIntermodulation Distortion (IMD)
DBaud rate

42. - E9A05

What is included in the total resistance of an antenna system?

SelectAnswer
ARadiation resistance plus ohmic resistance
BRadiation resistance plus space impedance
CTransmission-line resistance plus radiation resistance
DRadiation resistance plus transmission resistance

43. - E9B09

What type of computer program technique is commonly used for modeling antennas?

SelectAnswer
AMethod of Moments
BGraphical analysis
CCalculus differentiation with respect to physical properties
DMutual impedance analysis

44. - E9C03

What is the radiation pattern of two 1/4 wavelength vertical antennas spaced a 1/2 wavelength apart and fed in phase?

SelectAnswer
ACardioid
BOmni-directional
CA Figure-8 end-fire along the axis of the array
DA Figure-8 broadside to the axis of the array

45. - E9D07

What is an advantage of using top loading in a shortened HF vertical antenna?

SelectAnswer
AGreater structural strength
BHigher losses
CLower Q
DImproved radiation efficiency

46. - E9E05

How must the driven element in a 3-element Yagi be tuned to use a hairpin matching system?

SelectAnswer
AThe driven element reactance must be inductive
BThe driven element radiation resistance must be higher than the characteristic impedance of the transmission line
CThe driven element resonance must be lower than the operating frequency
DThe driven element reactance must be capacitive

47. - E9F02

Which of the following determines the velocity factor of a transmission line?

SelectAnswer
ADielectric materials used in the line
BThe line length
CThe center conductor resistivity
DThe termination impedance

48. - E9G10

What do the arcs on a Smith chart represent?

SelectAnswer
APoints with constant reactance
BFrequency
CSWR
DPoints with constant resistance

49. - E9H04

What is an advantage of using a shielded loop antenna for direction finding?

SelectAnswer
AIt is electro statically balanced against ground, giving better nulls
BIt automatically cancels ignition noise in mobile installations
CIt eliminates tracking errors caused by strong out-of-band signals
DIt allows stations to communicate without giving away their position

50. - E0A05

What is one of the potential hazards of using microwaves in the amateur radio bands?

SelectAnswer
AMicrowaves often travel long distances by ionospheric reflection
BThe high gain antennas commonly used can result in high exposure levels
CThe extremely high frequency energy can damage the joints of antenna structures
DMicrowaves are ionizing radiation