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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 named in an amateur station license grant
CAny person holding an FCC issued amateur license or who is authorized for alien reciprocal operation
DOnly a person with an FCC Marine Radio

2. - E1B10

What frequencies are authorized to an amateur station operating under RACES rules?

SelectAnswer
ASpecific segments in the amateur service MF, HF, VHF and UHF bands
BAll amateur service frequencies authorized to the control operator
CSpecific local government channels
DMilitary Auxiliary Radio System (MARS) channels

3. - E1C07

What is meant by local control?

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

4. - E1D02

What is the amateur satellite service?

SelectAnswer
AA radio communications service using stations on Earth satellites for public service broadcast
BA radio communications service using amateur radio stations on satellites
CA radio navigation service using satellites for the purpose of self training, intercommunication and technical studies carried out by amateurs
DA spacecraft launching service for amateur-built satellites

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

6. - E1F07

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

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

7. - E2A02

What is the direction of a descending pass for an amateur satellite?

SelectAnswer
AFrom east to west
BFrom west to east
CFrom north to south
DFrom south to north

8. - 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 front end limiter
BNo other hardware is needed
CA special notch filter to remove synchronization pulses
DA special IF converter

9. - E2C08

Which of the following contacts may be confirmed through the U.S. QSL bureau system?

SelectAnswer
AContacts between a U.S. station and a non-U.S. station
BSpecial event contacts between stations in the U.S.
CContacts using tactical call signs
DRepeater contacts between U.S. club members

10. - E2D13

What type of modulation is used for JT65 contacts?

SelectAnswer
AMulti-tone AFSK
BPSK
CRTTY
DIEEE 802.11

11. - E2E11

What is the difference between direct FSK and audio FSK?

SelectAnswer
ADirect FSK uses a DC-coupled data connection
BAudio FSK has a superior frequency response
CAudio FSK can be performed anywhere in the transmit chain
DDirect FSK applies the data signal to the transmitter VFO

12. - E3A09

Which of the following frequency range is most suited for meteor scatter communications?

SelectAnswer
A1.8 MHz - 1.9 MHz
B10 MHz - 14 MHz
C28 MHz - 148 MHz
D220 MHz - 450 MHz

13. - E3B03

What is the best time of day for transequatorial propagation?

SelectAnswer
ANoon
BLate at night
CAfternoon or early evening
DMorning

14. - E3C01

What does the term ray tracing describe in regard to radio communications?

SelectAnswer
AModeling a radio wave's path through the ionosphere
BDetermining the radiation pattern from an array of antennas
CEvaluating high voltage sources for X-Rays
DThe process in which an electronic display presents a pattern

15. - E4A02

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

SelectAnswer
ARF amplitude and time
BSWR and frequency
CSWR and time
DRF amplitude and frequency

16. - E4B10

Which of the following describes a method to measure intermodulation distortion in an SSB transmitter?

SelectAnswer
AModulate the transmitter with two non-harmonically related radio frequencies and observe the RF output with a spectrum analyzer
BModulate the transmitter with two harmonically related audio frequencies and observe the RF output with a peak reading wattmeter
CModulate the transmitter with two harmonically related audio frequencies and observe the RF output with a logic analyzer
DModulate the transmitter with two non-harmonically related audio frequencies and observe the RF output with a spectrum analyzer

17. - E4C04

How is the noise figure of a receiver defined?

SelectAnswer
AThe ratio of thermal noise to atmospheric noise
BThe ratio in dB of the noise generated by the receiver to the theoretical minimum noise
CThe ratio of the noise bandwidth in Hertz to the theoretical bandwidth of a resistive network
DThe ratio of atmospheric noise to phase noise

18. - E4D11

Why are third-order intermodulation products created within a receiver of particular interest compared to other products?

SelectAnswer
AThe third-order product of two signals which are in the band of interest is also likely to be within the band
BThird-order products are an indication of poor image rejection
CThe third-order intercept is much higher than other orders
DThird-order intermodulation produces three products for every input signal within the band of interest

19. - E4E10

What is a common characteristic of interference caused by a touch controlled electrical device?

SelectAnswer
AThe interfering signal can be several kHz in width and usually repeats at regular intervals across a HF band
BThe interfering signal may drift slowly across the HF spectrum
CAll of these choices are correct
DThe interfering signal sounds like AC hum on an AM receiver or a carrier modulated by 60 Hz hum on a SSB or CW receiver

20. - E5A02

What is resonance in an electrical circuit?

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

21. - E5B12

What is admittance?

SelectAnswer
AThe term for the gain of a field effect transistor
BThe unit used for Q factor
CThe turns ratio of a transformer
DThe inverse of impedance

22. - E5C08

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

SelectAnswer
AFaraday grid
BPolar coordinates
CElliptical coordinates
DMaidenhead grid

23. - E5D15

What is the power factor of an R-L circuit having a 45 degree phase angle between the voltage and the current?

SelectAnswer
A1.0
B0.866
C0.5
D0.707

24. - E6A03

Why does a PN-junction diode not conduct current when reverse biased?

SelectAnswer
AOnly N-type semiconductor material can conduct current
BOnly P-type semiconductor material can conduct current
CHoles in P-type material and electrons in the N-type material are separated by the applied voltage, widening the depletion region
DExcess holes in P-type material combine with the electrons in N-type material, converting the entire diode into an insulator

25. - E6B07

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

SelectAnswer
AExcessive inverse voltage
BInsufficient forward voltage
CCharge carrier depletion
DExcessive junction temperature

26. - E6C12

What is BiCMOS logic?

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

27. - E6D15

What is current in the primary winding of a transformer called if no load is attached to the secondary?

SelectAnswer
AMagnetizing current
BDirect current
CExcitation current
DStabilizing current

28. - E6E02

Which of the following device packages is a through-hole type?

SelectAnswer
ADIP
BPLCC
CBall grid array
DSOT

29. - E6F03

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

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

30. - E7A08

What logical operation does an OR gate perform?

SelectAnswer
AIt produces logic "1" at its output if any or all inputs are logic "1"
BIt only produces logic "0" at its output when all inputs are logic "1"
CIt produces logic "1" at its output if all inputs are logic "0"
DIt produces logic "0" at its output if all inputs are logic "1"

31. - E7B04

Where on the load line of a Class A common emitter amplifier would bias normally be set?

SelectAnswer
AApproximately half-way between saturation and cutoff
BAt a point where the bias resistor equals the load resistor
CWhere the load line intersects the voltage axis
DAt a point where the load line intersects the zero bias current curve

32. - E7C02

Which of the following is a property of a T-network with series capacitors and a parallel shunt inductor?

SelectAnswer
AIt is a band-pass filter
BIt is a notch filter
CIt is a high-pass filter
DIt is a low-pass filter

33. - E7D02

What is one characteristic of a switching electronic voltage regulator?

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

34. - E7E12

What is a frequency discriminator stage in a FM receiver?

SelectAnswer
AAn automatic band-switching circuit
BAn FM generator circuit
CA circuit for detecting FM signals
DA circuit for filtering two closely adjacent signals

35. - E7F08

What is the function of decimation with regard to digital filters?

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

36. - E7G01

What is the typical output impedance of an integrated circuit op-amp?

SelectAnswer
AVery low
B1000 ohms
CVery high
D100 ohms

37. - E7H15

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

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

38. - E8A09

How many levels can an analog-to-digital converter with 8 bit resolution encode?

SelectAnswer
A256 divided by the gain of the input amplifier
B8
C8 multiplied by the gain of the input amplifier
D256

39. - E8B02

How does the modulation index of a phase-modulated emission vary with RF carrier frequency (the modulated frequency)?

SelectAnswer
AIt varies with the square root of the RF carrier frequency
BIt increases as the RF carrier frequency increases
CIt does not depend on the RF carrier frequency
DIt decreases as the RF carrier frequency increases

40. - E8C10

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

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

41. - E8D11

What is one advantage of using ASCII code for data communications?

SelectAnswer
AIt includes built in error correction features
BIt contains fewer information bits per character than any other code
CIt is possible to transmit both upper and lower case text
DIt uses one character as a shift code to send numeric and special characters

42. - E9A09

How is antenna efficiency calculated?

SelectAnswer
A(effective radiated power / transmitter output) x 100 percent
B(radiation resistance / transmission resistance) x 100 per cent
C(total resistance / radiation resistance) x 100 per cent
D(radiation resistance / total resistance) x 100 per cent

43. - E9B03

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

SelectAnswer
A18 dB
B14 dB
C12 dB
D24 dB

44. - E9C10

Which of the following describes a Zepp antenna?

SelectAnswer
AAn omni-directional antenna commonly used for satellite communications
BA dipole constructed from zip cord
CA vertical array capable of quickly changing the direction of maximum radiation by changing phasing lines
DAn end fed dipole antenna

45. - E9D12

Which of the following would provide the best RF ground for your station?

SelectAnswer
AA 50 ohm resistor connected to ground
BAn electrically short connection to 3 or 4 interconnected ground rods via a series RF choke
CAn electrically short connection to a metal water pipe
DAn electrically short connection to 3 or 4 interconnected ground rods driven into the Earth

46. - E9E01

What system matches a higher impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places spaced a fraction of a wavelength each side of element center?

SelectAnswer
AThe delta matching system
BThe gamma matching system
CThe stub matching system
DThe omega matching system

47. - E9F16

Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric cable, assuming all other parameters are the same?

SelectAnswer
AAll of these choices are correct
BFoam dielectric has lower loss per unit of length
CFoam dielectric has higher velocity factor
DFoam dielectric has lower safe operating voltage limits

48. - E9G04

What are the two families of circles and arcs that make up a Smith chart?

SelectAnswer
AResistance and voltage
BReactance and voltage
CVoltage and impedance
DResistance and reactance

49. - E9H05

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

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

50. - 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
CReduce RFI to telephones and home entertainment systems
DLightning protection