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US Amateur Radio - General (Element 3, 2015-2019) Practice Test

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1. - G1A07

Which of the following frequencies is within the General Class portion of the 20-meter phone band?

SelectAnswer
A14305 kHz
B14105 kHz
C14005 kHz
D14405 kHz

2. - G1B06

When is an amateur station permitted to transmit secret codes?

SelectAnswer
ATo control a space station
BDuring a declared communications emergency
COnly with Special Temporary Authorization from the FCC
DOnly when the information is of a routine, personal nature

3. - G1C04

Which of the following limitations apply to transmitter power on every amateur band?

SelectAnswer
AEffective radiated power cannot exceed 1500 watts
BPower should be limited as necessary to avoid interference to another radio service on the frequency
CPower must be limited to 200 watts when transmitting between 14.100 MHz and 14.150 MHz
DOnly the minimum power necessary to carry out the desired communications should be used

4. - G1D06

When must you add the special identifier "AG" after your call sign if you are a Technician Class licensee and have a CSCE for General Class operator privileges, but the FCC has not yet posted your upgrade on its website ?

SelectAnswer
AWhenever you operate using General Class frequency privileges
BA special identifier is not required as long as your General Class license application has been filed with the FCC
CWhenever you operate using Technician frequency privileges
DWhenever you operate on any amateur frequency

5. - G1E05

What types of messages for a third party in another country may be transmitted by an amateur station?

SelectAnswer
AOnly messages for other licensed amateurs
BAny message, as long as the amateur operator is not paid
CAny messages, as long as the text of the message is recorded in the station log
DOnly messages relating to Amateur Radio or remarks of a personal character, or messages relating to emergencies or disaster relief

6. - G2A11

What does the expression "CQ DX" usually indicate?

SelectAnswer
AA general call for any station
BThe caller is looking for any station outside their own country
CA distress call
DThe caller is listening for a station in Germany

7. - G2B11

What frequency should be used to send a distress call?

SelectAnswer
AWhichever frequency has the best chance of communicating the distress message
BOnly frequencies authorized for RACES or ARES stations
COnly frequencies used by police, fire or emergency medical services
DOnly frequencies that are within your operating privileges

8. - G2C06

What does the term "zero beat" mean in CW operation?

SelectAnswer
AMatching the speed of the transmitting station
BSending without error
COperating split to avoid interference on frequency
DMatching your transmit frequency to the frequency of a received signal

9. - G2D06

How is a directional antenna pointed when making a "long-path" contact with another station?

SelectAnswer
A180 degrees from its short-path heading
BAlong the gray line
CToward the north
DToward the rising Sun

10. - G2E14

What could be wrong if you cannot decode an RTTY or other FSK signal even though it is apparently tuned in properly?

SelectAnswer
AThe mark and space frequencies may be reversed
BYou may be listening on the wrong sideband
CYou may have selected the wrong baud rate
DAll of these choices are correct

11. - G3A09

What effect does a high sunspot number have on radio communications?

SelectAnswer
ALong-distance communication in the upper HF and lower VHF range is enhanced
BMicrowave communications become unstable
CFrequencies above 300 MHz become usable for long-distance communication
DHigh-frequency radio signals become weak and distorted

12. - G3B09

What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?

SelectAnswer
A12,000 miles
B1,200 miles
C180 miles
D2,500 miles

13. - G3C07

What makes HF scatter signals often sound distorted?

SelectAnswer
AThe E-region is not present
BGround waves are absorbing much of the signal
CEnergy is scattered into the skip zone through several different radio wave paths
DThe ionospheric layer involved is unstable

14. - G4A05

What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?

SelectAnswer
ATo reduce harmonic radiation
BTo balance the transmitter audio frequency response
CTo increase overall efficiency
DTo reduce distortion due to excessive drive

15. - G4B03

Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?

SelectAnswer
AA wavemeter
BA sidetone monitor
CAn oscilloscope
DA field strength meter

16. - G4C02

Which of the following could be a cause of interference covering a wide range of frequencies?

SelectAnswer
ANot using a balun or line isolator to feed balanced antennas
BUsing a balun to feed an unbalanced antenna
CLack of rectification of the transmitter's signal in power conductors
DArcing at a poor electrical connection

17. - G4D03

Which of the following can be the result of an incorrectly adjusted speech processor?

SelectAnswer
ASplatter
BAll of these choices are correct
CDistorted speech
DExcessive background pickup

18. - G4E07

Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?

SelectAnswer
AThe vehicle control computer
BThe fuel delivery system
CAll of these choices are correct
DThe battery charging system

19. - G5A12

What is one reason to use an impedance matching transformer?

SelectAnswer
ATo minimize transmitter power output
BTo reduce power supply ripple
CTo maximize the transfer of power
DTo minimize radiation resistance

20. - G5B01

What dB change represents a two-times increase or decrease in power?

SelectAnswer
AApproximately 3 dB
BApproximately 12 dB
CApproximately 2 dB
DApproximately 6 dB

21. - G5C02

What happens if you reverse the primary and secondary windings of a 4:1 voltage step down transformer?

SelectAnswer
AAdditional resistance must be added in series with the primary to prevent overload
BAdditional resistance must be added in parallel with the secondary to prevent overload
CThe secondary voltage becomes 4 times the primary voltage
DThe transformer no longer functions as it is a unidirectional device

22. - G6A03

What is the approximate junction threshold voltage of a germanium diode?

SelectAnswer
A0.7 volts
B1.0 volts
C0.1 volt
D0.3 volts

23. - G6B13

Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?

SelectAnswer
ADB-25
BPL-259
COctal
DRJ-11

24. - G7A05

What portion of the AC cycle is converted to DC by a half-wave rectifier?

SelectAnswer
A90 degrees
B180 degrees
C270 degrees
D360 degrees

25. - G7B05

How many states does a 3-bit binary counter have?

SelectAnswer
A6
B8
C16
D3

26. - G7C06

What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?

SelectAnswer
ASubstantially higher
BTwice the transmission line impedance
CSubstantially lower
DAbout the same

27. - G8A11

What is the modulation envelope of an AM signal?

SelectAnswer
AThe waveform created by connecting the peak values of the modulated signal
BSpurious signals that envelop nearby frequencies
CThe carrier frequency that contains the signal
DThe bandwidth of the modulated signal

28. - G8B04

What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?

SelectAnswer
APre-emphasis network
BMixer
CMultiplier
DReactance modulator

29. - G8C07

How does the receiving station respond to an ARQ data mode packet containing errors?

SelectAnswer
AIt sends the packet back to the transmitting station
BIt terminates the contact
CIt requests a change in transmitting protocol
DIt requests the packet be retransmitted

30. - G9A07

What must be done to prevent standing waves on an antenna feed line?

SelectAnswer
AThe feed line must be cut to a length equal to an even number of physical half wavelengths
BThe feed line must be cut to a length equal to an odd number of electrical quarter wavelengths
CThe antenna feed point impedance must be matched to the characteristic impedance of the feed line
DThe antenna feed point must be at DC ground potential

31. - G9B07

How does the feed point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below 1/4 wave above ground?

SelectAnswer
AIt is unaffected by the height above ground
BIt steadily increases
CIt steadily decreases
DIt peaks at about 1/8 wavelength above ground

32. - G9C18

What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of either side?

SelectAnswer
AThe radiated signal becomes circularly polarized
BThere is no change in polarization
CThe polarization of the radiated signal changes from horizontal to vertical
DThe polarization of the radiated signal changes from vertical to horizontal

33. - G9D02

Which of the following is an advantage of an NVIS antenna?

SelectAnswer
AHigh forward gain
BLow vertical angle radiation for working stations out to ranges of several thousand kilometers
CAll of these choices are correct
DHigh vertical angle radiation for working stations within a radius of a few hundred kilometers

34. - G0A10

What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna?

SelectAnswer
AChange to a non-polarized antenna with higher gain
BUse an antenna with a higher front-to-back ratio
CTake precautions to ensure that the antenna cannot be pointed in their direction
DPost a warning sign that is clearly visible to the neighbor

35. - G0B05

Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?

SelectAnswer
AAll of these choices are correct
BCurrent flowing from one or more of the voltage-carrying wires to the neutral wire
COvervoltage on the voltage-carrying wires
DCurrent flowing from one or more of the voltage-carrying wires directly to ground