Anonymous User

Hamboozler

US Amateur Radio - Amateur Extra (Element 4, 2020-2024) Practice Test

Logging in (or registering) will help the system to select questions that you need to focus on.

1. - E0A01

What is the primary function of an external earth connection or ground rod?

SelectAnswer
AReduce received noise
BReduce RF current flow between pieces of equipment
CLightning protection
DReduce RFI to telephones and home entertainment systems

2. - E1A13

Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?

SelectAnswer
AOnly a person with an FCC Marine Radio license grant
BOnly a person named in an amateur station license grant
CAny person named in an amateur station license grant or a person holding an unrestricted Radiotelephone Operator Permit
DAny person holding an FCC issued amateur license or who is authorized for alien reciprocal operation

3. - E1B11

What does PRB-1 require of regulations affecting amateur radio?

SelectAnswer
AAmateur radio operations must be permitted in any private residence
BReasonable accommodations of amateur radio must be made
CUse of wireless devices in a vehicle is exempt from regulation
DNo limitations may be placed on antenna size or placement

4. - E1C05

When may an automatically controlled station originate third party communications?

SelectAnswer
AWhen approved by the National Telecommunication and Information Administration
BNever
COnly when transmitting RTTY or data emissions
DWhen agreed upon by the sending or receiving station

5. - E1D06

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

SelectAnswer
A1 watt
B100 watts
C2 watts
D5 watts

6. - E1E11

What must the VE team do if an examinee scores a passing grade on all examination elements needed for an upgrade or new license?

SelectAnswer
AAll these choices are correct
BThree VEs must certify that the examinee is qualified for the license grant and that they have complied with the administering VE requirements
CPhotocopy all examination documents and forward them to the FCC for processing
DIssue the examinee the new or upgrade license

7. - E1F07

When may an amateur station send a message to a business?

SelectAnswer
AWhen transmitting international third-party communications
BWhen the total money involved does not exceed $25
CWhen the control operator is employed by the FCC or another government agency
DWhen neither the amateur nor his or her employer has a pecuniary interest in the communications

8. - E2A04

What is meant by the term mode? as applied to an amateur radio satellite?

SelectAnswer
AThe satellite's orientation with respect to the Earth
BWhether the satellite is in a low earth or geostationary orbit
CWhether the satellite is in a polar or equatorial orbit
DThe satellite's uplink and downlink frequency bands

9. - E2B09

What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?

SelectAnswer
AA special IF converter
BA special notch filter to remove synchronization pulses
CNo other hardware is needed
DA special front end limiter

10. - E2C10

Why might a DX station state that they are listening on another frequency?

SelectAnswer
ATo improve operating efficiency by reducing interference
BAll these choices are correct
CBecause the DX station may be transmitting on a frequency that is prohibited to some responding stations
DTo separate the calling stations from the DX station

11. - E2D05

What is one advantage of the JT65 mode?

SelectAnswer
AThe ability to decode signals which have a very low signal-to-noise ratio
BPermits fast-scan TV transmissions over narrow bandwidth
CUses only a 65 Hz bandwidth
DEasily copied by ear if necessary

12. - E2E02

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

SelectAnswer
AForward Error Correction
BFinal Error Correction
CFatal Error Correction
DFirst Error Correction

13. - E3A07

Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

SelectAnswer
AUrban areas
BForests
CMountain ranges
DBodies of water

14. - E3B11

At what time of day can sporadic E propagation occur?

SelectAnswer
AAny time
BOnly around sunset and sunrise
COnly in hours of darkness
DOnly around sunset

15. - E3C11

What does VOACAP software model?

SelectAnswer
AHF propagation
BVHF radio propagation
CAC voltage and impedance
DAC current and impedance

16. - E4A11

How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance?

SelectAnswer
AConnect the antenna feed line directly to the analyzer's connector
BLoosely couple the antenna and a dummy load to the analyzer
CLoosely couple the analyzer near the antenna base
DConnect the analyzer via a high-impedance transformer to the antenna

17. - E4B09

What is indicated if the current reading on an RF ammeter placed in series with the antenna feed line of a transmitter increases as the transmitter is tuned to resonance?

SelectAnswer
AThere is an impedance mismatch between the antenna and feed line
BThere is possibly a short to ground in the feed line
CThere is more power going into the antenna
DThe transmitter is not properly neutralized

18. - E4C09

Which of the following choices is a good reason for selecting a high frequency for the design of the IF in a superheterodyne HF or VHF communications receiver?

SelectAnswer
AFewer components in the receiver
BEasier for front-end circuitry to eliminate image responses
CReduced drift
DImproved receiver noise figure

19. - E4D02

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

SelectAnswer
AOscillator instability and severe audio distortion of all but the strongest received signals
BCross-modulation of the desired signal and insufficient audio power to operate the speaker
CSpurious signals caused by cross-modulation and desensitization from strong adjacent signals
DOscillator instability requiring frequent retuning and loss of ability to recover the opposite sideband

20. - 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
BThe audio frequency bandwidth of the received signal might be compressed
CReceived audio in the speech range might have an echo effect
DFM signals can no longer be demodulated

21. - E5A02

What is resonance in an LC or RLC circuit?

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

22. - E5B11

What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?

SelectAnswer
A14 degrees with the voltage leading the current
B14 degrees with the voltage lagging the current
C76 degrees with the voltage leading the current
D76 degrees with the voltage lagging the current

23. - E5C09

When using rectangular coordinates to graph the impedance of a circuit, what do the axes represent?

SelectAnswer
AThe X axis represents the reactive component and the Y axis represents the resistive component
BThe X axis represents the magnitude and the Y axis represents the phase angle
CThe X axis represents the phase angle and the Y axis represents the magnitude
DThe X axis represents the resistive component and the Y axis represents the reactive component

24. - E5D06

In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

SelectAnswer
AIn a direction opposite to the current
BIn a circle around the conductor
CIn the same direction as the current
DIn all directions; omni-directional

25. - E6A05

How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?

SelectAnswer
AThey are both high impedance
BAn FET has higher input impedance
CAn FET has lower input impedance
DThey are both low impedance

26. - E6B07

What is the failure mechanism when a junction diode fails due to excessive current?

SelectAnswer
AInsufficient forward voltage
BExcessive junction temperature
CCharge carrier depletion
DExcessive inverse voltage

27. - E6C10

In Figure E6-3, what is the schematic symbol for a NOR gate?

SelectAnswer
A1
B2
C4
D3

28. - E6D02

What is the equivalent circuit of a quartz crystal?

SelectAnswer
AMotional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in parallel
BMotional inductance and loss resistance in series, paralleled with motional capacitance and a capacitor representing electrode and stray capacitance
CMotional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in series
DMotional capacitance, motional inductance, and loss resistance in series, all in parallel with a shunt capacitor representing electrode and stray capacitance

29. - E6E04

Which is the most common input and output impedance of circuits that use MMICs?

SelectAnswer
A50 ohms
B10 ohms
C300 ohms
D450 ohms

30. - E6F09

What is the efficiency of a photovoltaic cell?

SelectAnswer
AThe open-circuit voltage divided by the short-circuit current under full illumination
BThe output RF power divided by the input DC power
CThe relative fraction of light that is converted to current
DCost per kilowatt-hour generated

31. - E7A04

How many flip-flops are required to divide a signal frequency by 4?

SelectAnswer
A1
B8
C4
D2

32. - E7B10

In Figure E7-1, what is the purpose of R1 and R2?

SelectAnswer
ASelf bias
BLoad resistors
CFeedback
DVoltage divider bias

33. - E7C01

How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?

SelectAnswer
AA capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between input and output
BAn 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
CTwo inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
DTwo capacitors are in series between the input and output, and an inductor is connected between the two capacitors and ground

34. - E7D14

What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?

SelectAnswer
ADischarge the capacitors when voltage is removed
BAll these choices are correct
CEqualize the voltage across each capacitor
DProvide a minimum load on the supply

35. - E7E05

What circuit is added to an FM transmitter to boost the higher audio frequencies?

SelectAnswer
AA heterodyne enhancer
BA pre-emphasis network
CA heterodyne suppressor
DA de-emphasis network

36. - E7F08

What is the function of decimation?

SelectAnswer
AConverting data to binary code decimal form
BAttenuating the signal
CReducing the effective sample rate by removing samples
DRemoving unnecessary significant digits

37. - E7G04

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

SelectAnswer
AThe differential input voltage needed to bring the open loop output voltage to zero
BThe output voltage of the op-amp minus its input voltage
CThe potential between the amplifier input terminals of the op-amp in an open loop condition
DThe difference between the output voltage of the op-amp and the input voltage required in the immediately following stage

38. - E7H14

What is a phase-locked loop circuit?

SelectAnswer
AAn electronic circuit also known as a monostable multivibrator
BAn electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
CAn electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
DAn electronic circuit consisting of a precision push-pull amplifier with a differential input

39. - E8A05

What of the following instruments would be the most accurate for measuring the RMS voltage of a complex waveform?

SelectAnswer
AAn absorption wave meter
BA D'Arsonval meter
CA true-RMS calculating meter
DA grid dip meter

40. - E8B08

What describes Orthogonal Frequency Division Multiplexing?

SelectAnswer
AA digital modulation technique using subcarriers at frequencies chosen to avoid intersymbol interference
BA bandwidth compression technique using Fourier transforms
CA digital mode for narrow-band, slow-speed transmissions
DA frequency modulation technique that uses non-harmonically related frequencies

41. - E8C05

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

SelectAnswer
A13 Hz
B26 Hz
C104 Hz
D52 Hz

42. - E8D04

What is the primary effect of extremely short rise or fall time on a CW signal?

SelectAnswer
AThe generation of RF harmonics
BLimits data speed
CMore difficult to copy
DThe generation of key clicks

43. - E9A04

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

SelectAnswer
AAntenna height
BThe settings of an antenna tuner at the transmitter
CThe input power level
DTransmission line length

44. - E9B08

What is the far field of an antenna?

SelectAnswer
AThe region where radiated field strengths are constant
BThe region where the shape of the antenna pattern is independent of distance
CThe region where radiated power dissipates over a specified time period
DThe region of the ionosphere where radiated power is not refracted

45. - E9C09

Which of the following describes a G5RV antenna?

SelectAnswer
AA multi-band dipole antenna fed with coax and a balun through a selected length of open wire transmission line
BA phased array antenna consisting of multiple loops
CA multi-band trap antenna
DA wide band dipole using shorted coaxial cable for the radiating elements and fed with aÿ4:1 balun

46. - E9D02

How can linearly polarized Yagi antennas be used to produce circular polarization?

SelectAnswer
AArrange two Yagis perpendicular to each other with the driven elements at the same point on the boom fed 90 degrees out of phase
BStack two Yagis fed in phase to form an array with the respective elements in parallel planes
CStack two Yagis fed 90 degrees out of phase to form an array with the respective elements in parallel planes
DArrange two Yagis collinear to each other with the driven elements fed 180 degrees out of phase

47. - E9E10

Which of these choices is an effective way to match an antenna with a 100-ohm feed point impedance to a 50-ohm coaxial cable feed line?

SelectAnswer
AInsert a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series between the antenna terminals and the 50-ohm feed cable
BInsert a 1/2 wavelength piece of 300-ohm twinlead in series between the antenna terminals and the 50-ohm feed cable
CConnect a 1/4-wavelength open stub of 300-ohm twinlead in parallel with the coaxial feed line where it connects to the antenna
DConnect a 1/2 wavelength shorted stub of 75-ohm cable in parallel with the 50-ohm cable where it attaches to the antenna

48. - E9F04

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

SelectAnswer
AVery low impedance
BVery high impedance
CThe same as the characteristic impedance of the line
DThe same as the output impedance of the generator

49. - E9G08

What is the process of normalization with regard to a Smith chart?

SelectAnswer
AReassigning reactance values with regard to the resistance axis
BReassigning impedance values with regard to the prime center
CReassigning prime center with regard to the reactance axis
DReassigning resistance values with regard to the reactance axis

50. - E9H07

Why is RF attenuation used when direction-finding?

SelectAnswer
ATo increase receiver sensitivity
BTo compensate for isotropic directivity and the antenna effect of feed lines
CTo prevent receiver overload which reduces pattern nulls
DTo narrow the receiver bandwidth

Figure E6-3

Figure E7-1