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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
ADiscontinue forwarding all messages
BDiscontinue forwarding the communication as soon as you become aware of it
CNotify the originating station that the communication does not comply with FCC rules
DNotify the nearest FCC Field Engineer's office

2. - E1B06

Which of the following additional rules apply if you are installing an amateur station antenna at a site at or near a public use airport?

SelectAnswer
AYou may have to notify the Federal Aviation Administration and register it with the FCC as required by Part 17 of FCC rules
BNo special rules apply if your antenna structure will be less than 300 feet in height
CYou must file an Environmental Impact Statement with the EPA before construction begins
DYou must obtain a construction permit from the airport zoning authority

3. - E1C02

What is meant by automatic control of a station?

SelectAnswer
AThe use of a control link between a control point and a locally controlled station
BA station operating with its output power controlled automatically
CThe use of devices and procedures for control so that the control operator does not have to be present at a control point
DRemotely controlling a station's antenna pattern through a directional control link

4. - E1D07

Which amateur service HF bands have frequencies authorized for space stations?

SelectAnswer
AOnly the 40 m, 30 m, 20 m, 15 m, 12 m and 10 m bands
BOnly the 40 m, 20 m, 17 m, 15 m, 12 m and 10 m bands
CAll HF bands
DOnly the 40 m, 20 m, 17 m, 15 m and 10 m bands

5. - E1E08

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

SelectAnswer
AFriends of the VE
BAll of these choices are correct
CEmployees of the VE
DRelatives of the VE as listed in the FCC rules

6. - E1F01

On what frequencies are spread spectrum transmissions permitted?

SelectAnswer
AOnly on amateur frequencies above 420 MHz
BOnly on amateur frequencies above 50 MHz
COnly on amateur frequencies above 144 MHz
DOnly on amateur frequencies above 222 MHz

7. - E2A10

Why may the received signal from an amateur satellite exhibit a rapidly repeating fading effect?

SelectAnswer
ABecause of ionospheric absorption
BBecause of the Doppler Effect
CBecause of the satellite's low orbital altitude
DBecause the satellite is spinning

8. - E2B03

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

SelectAnswer
ABy scanning odd numbered lines in one field and even numbered lines in the next
BBy scanning two fields simultaneously
CBy scanning each field from bottom to top
DBy scanning lines from left to right in one field and right to left in the next

9. - E2C02

Which of the following best describes the term self-spotting in regards to HF contest operating?

SelectAnswer
AThe acceptable practice of manually posting the call signs of stations on a spotting network
BThe generally prohibited practice of posting one's own call sign and frequency on a spotting network
CA manual technique for rapidly zero beating or tuning to a station's frequency before calling that station
DAn automatic method for rapidly zero beating or tuning to a station's frequency before calling that station

10. - E2D11

Which of the following data are used by the APRS network to communicate your location?

SelectAnswer
APolar coordinates
BRadio direction finding spectrum analysis
CLatitude and longitude
DTime and frequency

11. - E2E02

What do the letters FEC mean as they relate to digital operation?

SelectAnswer
AFinal Error Correction
BFirst Error Correction
CForward Error Correction
DFatal Error Correction

12. - E3A04

What do Hepburn maps predict?

SelectAnswer
ASporadic E propagation
BProbability of tropospheric propagation
CLikelihood of rain-scatter along cold or warm fronts
DLocations of auroral reflecting zones

13. - E3B08

What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?

SelectAnswer
AGray-line
BLong-path
CTransequatorial
DSporadic-E

14. - E3C14

Why does the radio-path horizon distance exceed the geometric horizon?

SelectAnswer
AD-region skip
BDownward bending due to density variations in the atmosphere
CE-region skip
DDownward bending due to aurora refraction

15. - E4A04

What determines the upper frequency limit for a computer soundcard-based oscilloscope program?

SelectAnswer
AAll of these choices are correct
BQ of the interface of the interface circuit
CAmount of memory on the soundcard
DAnalog-to-digital conversion speed of the soundcard

16. - E4B06

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?

SelectAnswer
A25 watts
B125 watts
C100 watts
D75 watts

17. - E4C06

A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?

SelectAnswer
A-164 dBm
B-174 dBm
C-155 dBm
D-148 dBm

18. - E4D01

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

SelectAnswer
AThe minimum difference in dB between the levels of two FM signals which will cause one signal to block the other
BThe difference in dB between the noise floor and the level of an incoming signal which will cause 1 dB of gain compression
CThe minimum difference in dB between two signals which produce third order intermodulation products greater than the noise floor
DThe difference in dB between the noise floor and the third order intercept point

19. - E4E06

What is a major cause of atmospheric static?

SelectAnswer
AThunderstorms
BMeteor showers
CSolar radio frequency emissions
DGeomagnetic storms

20. - E5A02

What is resonance in an electrical circuit?

SelectAnswer
AThe frequency at which the reactive impedance equals the resistive impedance
BThe highest frequency that will pass current
CThe lowest frequency that will pass current
DThe frequency at which the capacitive reactance equals the inductive reactance

21. - E5B03

What happens to the phase angle of a reactance when it is converted to a susceptance?

SelectAnswer
AIt is unchanged
BThe susceptance phase angle is the inverse of the reactance phase angle
CThe sign is reversed
DIt is shifted by 90 degrees

22. - E5C07

What is a vector?

SelectAnswer
AThe inverse of the sine function
BThe inverse of the tangent function
CA quantity with both magnitude and an angular component
DThe value of a quantity that changes over time

23. - E5D04

Why are short connections necessary at microwave frequencies?

SelectAnswer
ATo reduce noise figure
BBecause of ground reflections
CTo increase neutralizing resistance
DTo reduce phase shift along the connection

24. - E6A04

What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?

SelectAnswer
AInsulator impurity
BDonor impurity
CAcceptor impurity
DN-type impurity

25. - E6B06

Which of the following is a common use of a hot-carrier diode?

SelectAnswer
AAs a variable capacitance in an automatic frequency control circuit
BAs a VHF/UHF mixer or detector
CAs balanced mixers in FM generation
DAs a constant voltage reference in a power supply

26. - E6C10

In Figure E6-5, what is the schematic symbol for a NOR gate?

SelectAnswer
A3
B4
C2
D1

27. - E6D07

What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?

SelectAnswer
AFrom a few kHz to no more than 30 MHz
BFrom less than 20 Hz to approximately 300 MHz
CFrom about 100 kHz to at least 1000 GHz
DFrom approximately 10 Hz to no more than 3000 kHz

28. - E6E03

Which of the following materials is likely to provide the highest frequency of operation when used in MMICs?

SelectAnswer
ASilicon dioxide
BSilicon nitride
CGallium nitride
DSilicon

29. - E6F12

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

SelectAnswer
AProtons
BElectrons
CHoles
DPhotons

30. - E7A10

What is a truth table?

SelectAnswer
AA table of logic symbols that indicate the logic states of an op-amp
BA table of logic symbols that indicate the high logic states of an op-amp
CA diagram showing logic states when the digital device output is true
DA list of inputs and corresponding outputs for a digital device

31. - E7B12

What type of amplifier circuit is shown in Figure E7-1?

SelectAnswer
ACommon emitter
BEmitter follower
CCommon collector
DCommon base

32. - E7C06

What are the distinguishing features of an elliptical filter?

SelectAnswer
AGradual passband rolloff with extreme stop band ripple
BExtremely flat response over its pass band with gradually rounded stop band corners
CExtremely sharp cutoff with one or more notches in the stop band
DGradual passband rolloff with minimal stop band ripple

33. - E7D07

What is the purpose of C2 in the circuit shown in Figure E7-3?

SelectAnswer
AIt is a brute force filter for the output
BIt bypasses hum around D1
CTo provide fixed DC bias for Q1
DTo self-resonate at the hum frequency

34. - E7E06

Why is de-emphasis commonly used in FM communications receivers?

SelectAnswer
AFor higher efficiency
BTo remove third-order distortion products
CFor compatibility with transmitters using phase modulation
DTo reduce impulse noise reception

35. - E7F13

What is the function of taps in a digital signal processing filter?

SelectAnswer
AProvide access for debugging software
BSelect the point at which baseband signals are generated
CTo reduce excess signal pressure levels
DProvide incremental signal delays for filter algorithms

36. - E7G07

What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?

SelectAnswer
A24
B94
C47
D0.21

37. - E7H03

How is positive feedback supplied in a Hartley oscillator?

SelectAnswer
AThrough a tapped coil
BThrough a capacitive divider
CThrough link coupling
DThrough a neutralizing capacitor

38. - E8A07

What determines the PEP-to-average power ratio of a single-sideband phone signal?

SelectAnswer
AThe frequency of the modulating signal
BThe amplifier gain
CThe degree of carrier suppression
DThe characteristics of the modulating signal

39. - E8B07

Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?

SelectAnswer
AExtremely low-power contacts
BHigh speed digital modes
COFDM signals are not allowed on amateur bands
DEME

40. - E8C07

What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission?

SelectAnswer
A9.6 kHz
B5.76 kHz
C15.36 kHz
D4.8 kHz

41. - E8D12

What is the advantage of including a parity bit with an ASCII character stream?

SelectAnswer
AThe signal can overpower interfering signals
BFaster transmission rate
CSome types of errors can be detected SUBELEMENT E9 - ANTENNAS AND TRANSMISSION LINES [8 Exam Questions - 8 Groups] E9A Basic Antenna parameters: radiation resistance, gain, beamwidth, efficiency, beamwidth; effective radiated power, polarization E9A01 (C) What describes an isotropic antenna? A. A grounded antenna used to measure earth conductivity B. A horizontally polarized antenna used to compare Yagi antennas C. A theoretical antenna used as a reference for antenna gain D. A spacecraft antenna used to direct signals toward the earth
DForeign language characters can be sent

42. - E9A15

What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain?

SelectAnswer
A286 watts
B420 watts
C1977 watts
D78.7 watts

43. - E9B15

What is the front-to-back ratio of the radiation pattern shown in Figure E9-2?

SelectAnswer
A28 dB
B24 dB
C3 dB
D15 dB

44. - E9C07

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

SelectAnswer
A72 ohms
B300 ohms
C50 ohms
D450 ohms

45. - E9D11

Which of the following types of conductors would be best for minimizing losses in a station's RF ground system?

SelectAnswer
AA cable with six or seven 18 gauge conductors in parallel
BA single 12 gauge or 10 gauge stainless steel wire
CA resistive wire, such as spark plug wire
DA wide flat copper strap

46. - E9E13

What is a use for a Wilkinson divider?

SelectAnswer
AIt is used to feed high-impedance antennas from a low-impedance source
BIt is used to feed low-impedance loads from a high-impedance source
CIt divides the operating frequency of a transmitter signal so it can be used on a lower frequency band
DIt is used to divide power equally between two 50 ohm loads while maintaining 50 ohm input impedance

47. - E9F07

How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?

SelectAnswer
ALower loss
BLower velocity factor
CSmaller reflection coefficient
DHigher SWR

48. - E9G01

Which of the following can be calculated using a Smith chart?

SelectAnswer
ARadiation resistance
BAntenna radiation pattern
CRadio propagation
DImpedance along transmission lines

49. - E9H02

Which is generally true for low band (160 meter and 80 meter) receiving antennas?

SelectAnswer
AAll of these choices are correct
BThey must be erected at least 1/2 wavelength above the ground to attain good directivity
CLow loss coax transmission line is essential for good performance
DAtmospheric noise is so high that gain over a dipole is not important

50. - E0A10

What toxic material may be present in some electronic components such as high voltage capacitors and transformers?

SelectAnswer
APolychlorinated Biphenyls
BPolytetrafluroethylene
CPolyethylene
DPolymorphic silicon

Figure E6-5

Figure E7-1

Figure E7-3

Figure E7-4

Figure E9-2