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

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1. - 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
AAny person named in an amateur station license grant or a person holding an unrestricted Radiotelephone Operator Permit
BOnly a person with an FCC Marine Radio
COnly a person named in an amateur station license grant
DAny person holding an FCC issued amateur license or who is authorized for alien reciprocal operation

2. - E1B11

What is the permitted mean power of any spurious emission relative to the mean power of the fundamental emission from a station transmitter or external RF amplifier installed after January 1, 2003 and transmitting on a frequency below 30 MHZ?

SelectAnswer
AAt least 63 dB below
BAt least 43 dB below
CAt least 53 dB below
DAt least 73 dB below

3. - E1C07

What is meant by local control?

SelectAnswer
AAutomatically manipulating local station controls
BDirect manipulation of the transmitter by a control operator
CControlling a repeater using a portable handheld transceiver
DControlling a station through a local auxiliary link

4. - E1D05

What class of licensee is authorized to be the control operator of a space station?

SelectAnswer
AOnly Amateur Extra Class
BAny class with appropriate operator privileges
COnly General, Advanced or Amateur Extra Class
DAll except Technician Class

5. - 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
AIssue the examinee the new or upgrade license
BThree VEs must certify that the examinee is qualified for the license grant and that they have complied with the administering VE requirements
CAll these choices are correct
DPhotocopy all examination documents and forward them to the FCC for processing

6. - E1F02

What privileges are authorized in the U.S. to persons holding an amateur service license granted by the Government of Canada?

SelectAnswer
AFull privileges, up to and including those of the Extra Class License, on the 80, 40, 20, 15, and 10 meter bands
BThe operating terms and conditions of the Canadian amateur service license, not to exceed U.S. Extra Class privileges
CAll privileges of the Extra Class license
DNone, they must obtain a U.S. license

7. - E2A03

What is the orbital period of an Earth satellite?

SelectAnswer
AThe point of maximum height of a satellite's orbit
BThe time it takes for a satellite to complete one revolution around the Earth
CThe time it takes for a satellite to travel from perigee to apogee
DThe point of minimum height of a satellite's orbit

8. - E2B08

Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?

SelectAnswer
AAll of these choices are correct
BA separate VHF or UHF audio link
CFrequency modulation of the video carrier
DFrequency-modulated sub-carrier

9. - E2C04

What type of transmission is most often used for a ham radio mesh network?

SelectAnswer
AFrequency division multiplex in the 24 GHz band
BMultiple Frequency Shift Keying in the 10 GHz band
CStore and forward on the 440 MHz band
DSpread spectrum in the 2.4 GHz band

10. - E2D14

What is one advantage of using JT65 coding?

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

11. - E2E03

How is the timing of JT65 contacts organized?

SelectAnswer
ABy exchanging ACK/NAK packets
BAlternating transmissions at 1 minute intervals
CStations take turns on alternate days
DIt depends on the lunar phase

12. - E3A15

What is an electromagnetic wave?

SelectAnswer
AA wave consisting of two magnetic fields at right angles to each other
BA wave consisting of an electric field and a magnetic field oscillating at right angles to each other
CA wave of alternating current, in the core of an electromagnet
DA wave consisting of two electric fields at parallel right angles to each other

13. - E3B02

What is the approximate maximum range for signals using transequatorial propagation?

SelectAnswer
A2500 miles
B7500 miles
C1000 miles
D5000 miles

14. - E3C04

What does the value of Bz (B sub Z) represent?

SelectAnswer
ADirection and strength of the interplanetary magnetic field
BGeomagnetic field stability
CCritical frequency for vertical transmissions
DDuration of long-delayed echoes

15. - E4A07

Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?

SelectAnswer
AAntenna analyzers display a time-varying representation of the modulation envelope
BAntenna analyzers automatically tune your antenna for resonance
CAntenna analyzers do not need an external RF source
DAll of these choices are correct

16. - E4B03

If a frequency counter with a specified accuracy of +/- 1.0 ppm reads 146,520,000 Hz, what is the most the actual frequency being measured could differ from the reading?

SelectAnswer
A165.2 Hz
B1.4652 MHz
C146.52 Hz
D14.652 kHz

17. - E4C08

An SDR receiver is overloaded when input signals exceed what level?

SelectAnswer
AOne-half the maximum sampling buffer size
BThe reference voltage of the analog-to-digital converter
CThe maximum count value of the analog-to-digital converter
DOne-half the maximum sample rate

18. - E4D06

What is the term for unwanted signals generated by the mixing of two or more signals?

SelectAnswer
ANeutralization
BIntermodulation interference
CAmplifier desensitization
DAdjacent channel interference

19. - E4E04

How can conducted and radiated noise caused by an automobile alternator be suppressed?

SelectAnswer
ABy installing a high-pass filter in series with the radio's power lead and a low-pass filter in parallel with the field lead
BBy connecting the radio's power leads directly to the battery and by installing coaxial capacitors in line with the alternator leads
CBy installing filter capacitors in series with the DC power lead and a blocking capacitor in the field lead
DBy installing a noise suppression resistor and a blocking capacitor in both leads

20. - E5A03

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

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

21. - E5B03

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

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

22. - E5C07

What is a vector?

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

23. - E5D05

Which parasitic characteristic increases with conductor length?

SelectAnswer
AInductance
BMalleability
CPermeability
DPermittivity

24. - E6A04

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

SelectAnswer
AAcceptor impurity
BDonor impurity
CN-type impurity
DInsulator impurity

25. - E6B12

What is one common use for PIN diodes?

SelectAnswer
AAs an RF switch
BAs a constant voltage source
CAs a high voltage rectifier
DAs a constant current source

26. - E6C03

What is tri-state logic?

SelectAnswer
ALogic devices with 0, 1, and high impedance output states
BProprietary logic devices manufactured by Tri-State Devices
CLow power logic devices designed to operate at 3 volts
DLogic devices that utilize ternary math

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 approximately 10 Hz to no more than 3000 kHz
DFrom about 100 kHz to at least 1000 GHz

28. - E6E07

Which of the following is typically used to construct a MMIC-based microwave amplifier?

SelectAnswer
AWave-soldering construction
BPoint-to-point construction
CMicrostrip construction
DGround-plane construction

29. - E6F03

What is the most common configuration of an optoisolator or optocoupler?

SelectAnswer
AAn LED and a phototransistor
BA frequency modulated helium-neon laser
CAn amplitude modulated helium-neon laser
DA lens and a photomultiplier

30. - E7A06

What is a characteristic of a monostable multivibrator?

SelectAnswer
AIt stores one bit of data in either a 0 or 1 state
BIt produces a continuous square wave oscillating between 1 and 0
CIt maintains a constant output voltage, regardless of variations in the input voltage
DIt switches momentarily to the opposite binary state and then returns to its original state after a set time

31. - E7B17

Why are odd-order rather than even-order intermodulation distortion products of concern in linear power amplifiers?

SelectAnswer
ABecause they are relatively far in frequency from the desired signal
BBecause they maintain the sidebands, thus causing multiple duplicate signals
CBecause they invert the sidebands causing distortion
DBecause they are relatively close in frequency to the desired signal

32. - E7C09

What is a Jones filter as used as part of an HF receiver IF stage?

SelectAnswer
AA filter that removes impulse noise E7C10 (B) Which of the following filters would be the best choice for use in a 2 meter repeater duplexer? A. A crystal filter B. A cavity filter C. A DSP filter D. An L-C filter
BA special filter that emphasizes image responses
CAn automatic notch filter
DA variable bandwidth crystal lattice filter

33. - E7D05

Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?

SelectAnswer
AA series regulator
BA constant current source
CA shunt current source
DA shunt regulator

34. - E7E05

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

SelectAnswer
AA de-emphasis network
BA heterodyne suppressor
CA pre-emphasis network
DAn audio prescaler

35. - E7F11

What sets the minimum detectable signal level for an SDR in the absence of atmospheric or thermal noise?

SelectAnswer
AReference voltage level and sample width in bits
BData storage transfer rate
CSample clock phase noise
DMissing codes and jitter

36. - E7G04

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

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

37. - E7H15

Which of these functions can be performed by a phase-locked loop?

SelectAnswer
AFrequency synthesis, FM demodulation
BPhotovoltaic conversion, optical coupling
CComparison of two digital input signals, digital pulse counter
DWide-band AF and RF power amplification

38. - E8A03

What type of wave does a Fourier analysis show to be made up of sine waves of a given fundamental frequency plus all of its harmonics?

SelectAnswer
AA cosine wave
BA sawtooth wave
CA square wave
DA sine wave

39. - E8B09

What is meant by deviation ratio?

SelectAnswer
AThe ratio of the carrier center frequency to the audio modulating frequency
BThe ratio of the audio modulating frequency to the center carrier frequency
CThe ratio of the highest audio modulating frequency to the average audio modulating frequency
DThe ratio of the maximum carrier frequency deviation to the highest audio modulating frequency

40. - E8C09

Which is the name of a digital code where each preceding or following character changes by only one bit?

SelectAnswer
AExcess 3 code
BBinary Coded Decimal Code
CGray code
DExtended Binary Coded Decimal Interchange Code

41. - E8D03

How does the spread spectrum technique of frequency hopping work?

SelectAnswer
AIf interference is detected by the receiver it will signal the transmitter to change frequencies
BA pseudo-random binary bit stream is used to shift the phase of an RF carrier very rapidly in a particular sequence
CIf interference is detected by the receiver it will signal the transmitter to wait until the frequency is clear
DThe frequency of the transmitted signal is changed very rapidly according to a particular sequence also used by the receiving station

42. - E9A08

What is meant by antenna bandwidth?

SelectAnswer
AThe frequency range over which an antenna satisfies a performance requirement
BThe angle formed between two imaginary lines drawn through the element ends
CThe angle between the half-power radiation points
DAntenna length divided by the number of elements

43. - E9B02

In the antenna radiation pattern shown in Figure E9-1, what is the front-to-back ratio?

SelectAnswer
A14 dB
B24 dB
C18 dB
D36 dB

44. - E9C09

What is a G5RV antenna?

SelectAnswer
AA wide band dipole using shorted coaxial cable for the radiating elements and fed with a 4:1 balun
BA multi-band trap antenna
CA multi-band dipole antenna fed with coax and a balun through a selected length of open wire transmission line
DA phased array antenna consisting of multiple loops

45. - E9D10

What happens to feed point impedance at the base of a fixed length HF mobile antenna as the frequency of operation is lowered?

SelectAnswer
AThe radiation resistance increases and the capacitive reactance decreases
BThe radiation resistance increases and the capacitive reactance increases
CThe radiation resistance decreases and the capacitive reactance decreases
DThe radiation resistance decreases and the capacitive reactance increases

46. - E9E03

What is the name of the matching system that uses a section of transmission line connected in parallel with the feed line at or near the feed point?

SelectAnswer
AThe delta match
BThe gamma match
CThe omega match
DThe stub match

47. - E9F02

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

SelectAnswer
AThe termination impedance
BThe line length
CDielectric materials used in the line
DThe center conductor resistivity

48. - E9G02

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

SelectAnswer
AVoltage circles and current arcs
BResistance lines and reactance chords
CResistance circles and reactance arcs
DVoltage lines and current chords

49. - E9H05

What is the main drawback of a wire-loop antenna for direction finding?

SelectAnswer
AIt is non-rotatable
BIt has a bidirectional pattern
CIt receives equally well in all directions
DIt is practical for use only on VHF bands

50. - E0A04

When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

SelectAnswer
AEach transmitter that produces 5 percent or more of its MPE limit at accessible locations
BOnly commercial transmitters
COnly the most powerful transmitter
DEach transmitter operating with a duty-cycle greater than 50 percent