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

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

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1. - G1A09

Which of the following frequencies is within the General Class portion of the 15-meter band?

Select	Answer
A	21300 kHz
B	24900 kHz
C	14250 kHz
D	18155 kHz

2. - G1B06

When is an amateur station permitted to transmit secret codes?

Select	Answer
A	Only with Special Temporary Authorization from the FCC
B	During a declared communications emergency
C	Only when the information is of a routine, personal nature
D	To control a space station

3. - G1C09

What is the maximum symbol rate permitted for RTTY or data emission transmitted on the 1.25-meter and 70-centimeter bands?

Select	Answer
A	1200 baud
B	56 kilobaud
C	300 baud
D	19.6 kilobaud

4. - G1D08

Which of the following criteria must be met for a non-U.S. citizen to be an accredited Volunteer Examiner?

Select	Answer
A	The person must be a resident of the U.S. for a minimum of 5 years
B	The person's home citizenship must be in ITU region 2
C	None of these choices is correct; a non-U.S. citizen cannot be a Volunteer Examiner
D	The person must hold an FCC granted Amateur Radio license of General Class or above

5. - G1E05

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

Select	Answer
A	Only messages relating to Amateur Radio or remarks of a personal character, or messages relating to emergencies or disaster relief
B	Any messages, as long as the text of the message is recorded in the station log
C	Any message, as long as the amateur operator is not paid
D	Only messages for other licensed amateurs

6. - G2A02

Which of the following modes is most commonly used for voice communications on the 160-meter, 75-meter, and 40-meter bands?

Select	Answer
A	Lower sideband
B	Vestigial sideband
C	Double sideband
D	Upper sideband

7. - G2B07

Which of the following complies with good amateur practice when choosing a frequency on which to initiate a call?

Select	Answer
A	Identify your station by transmitting your call sign at least 3 times
B	All of these choices are correct
C	Check to see if the channel is assigned to another station
D	Follow the voluntary band plan for the operating mode you intend to use

8. - G2C02

What should you do if a CW station sends "QRS"?

Select	Answer
A	Change frequency
B	Repeat everything twice
C	Send slower
D	Increase your power

9. - G2D05

When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?

Select	Answer
A	Only when the foreign country has a formal third party agreement filed with the FCC
B	Only when the foreign country is a member of the International Amateur Radio Union
C	When the contact is with amateurs in any country except those whose administrations have notified the ITU that they object to such communications
D	When the contact is with amateurs in any country as long as the communication is conducted in English

10. - G2E11

What is indicated on a waterfall display by one or more vertical lines adjacent to a PSK31 signal?

Select	Answer
A	Backscatter propagation
B	Long Path propagation
C	Overmodulation
D	Insufficient modulation

11. - G3A10

What causes HF propagation conditions to vary periodically in a 28 day cycle?

Select	Answer
A	Long term oscillations in the upper atmosphere
B	The Sun's rotation on its axis
C	Cyclic variation in the Earth's radiation belts
D	The position of the Moon in its orbit

12. - G3B11

What happens to HF propagation when the LUF exceeds the MUF?

Select	Answer
A	Propagation over the path on all HF frequencies is enhanced
B	Double hop propagation along the path is more common
C	No HF radio frequency will support ordinary sky-wave communications over the path
D	HF communications over the path are enhanced

13. - G3C11

Which of the following antenna types will be most effective for skip communications on 40-meters during the day?

Select	Answer
A	A vertical antenna
B	A left-hand circularly polarized antenna
C	A horizontal dipole placed between 1/8 and 1/4 wavelength above the ground
D	A right-hand circularly polarized antenna

14. - G4A13

What is one reason to use the attenuator function that is present on many HF transceivers?

Select	Answer
A	To reduce power consumption when operating from batteries
B	To slow down received CW signals for better copy
C	To reduce the transmitter power when driving a linear amplifier
D	To reduce signal overload due to strong incoming signals

15. - G4B08

Which of the following instruments may be used to monitor relative RF output when making antenna and transmitter adjustments?

Select	Answer
A	A field strength meter
B	A multimeter
C	An antenna noise bridge
D	A Q meter

16. - G4C06

What effect can be caused by a resonant ground connection?

Select	Answer
A	High RF voltages on the enclosures of station equipment
B	A ground loop
C	Corrosion of the ground rod
D	Overheating of ground straps

17. - G4D11

How close to the upper edge of the 20-meter General Class band should your displayed carrier frequency be when using 3 kHz wide USB?

Select	Answer
A	Your displayed carrier frequency may be set at the edge of the band
B	At least 1 kHz below the edge of the segment
C	At least 3 kHz below the edge of the band
D	At least 3 kHz above the edge of the band

18. - G4E11

Which of the following is a disadvantage of using wind as the primary source of power for an emergency station?

Select	Answer
A	All of these choices are correct
B	The voltage and current ratings of such systems are not compatible with amateur equipment
C	The conversion efficiency from mechanical energy to electrical energy is less than 2 percent
D	A large energy storage system is needed to supply power when the wind is not blowing

19. - G5A08

Why is impedance matching important?

Select	Answer
A	To ensure that the resistance and reactance in the circuit are equal
B	So the source can deliver maximum power to the load
C	To ensure that there is less resistance than reactance in the circuit
D	So the load will draw minimum power from the source

20. - G5B05

How many watts are dissipated when a current of 7.0 milliamperes flows through 1.25 kilohms resistance?

Select	Answer
A	Approximately 61 milliwatts
B	Approximately 11 watts
C	Approximately 11 milliwatts
D	Approximately 61 watts

21. - G5C16

Why is the conductor of the primary winding of many voltage step up transformers larger in diameter than the conductor of the secondary winding?

Select	Answer
A	To improve the coupling between the primary and secondary
B	To insure that the volume of the primary winding is equal to the volume of the secondary winding
C	To prevent parasitic oscillations due to resistive losses in the primary
D	To accommodate the higher current of the primary

22. - G6A16

What will happen to the resistance if the temperature of a resistor is increased?

Select	Answer
A	It will change depending on the resistor's reactance coefficient
B	It will stay the same
C	It will become time dependent
D	It will change depending on the resistor's temperature coefficient

23. - G6B12

Which of the following connectors would be a good choice for a serial data port?

Select	Answer
A	PL-259
B	DE-9
C	Type N
D	Type SMA

24. - G7A09

Which symbol in figure G7-1 represents a field effect transistor?

Select	Answer
A	Symbol 4
B	Symbol 2
C	Symbol 1
D	Symbol 5

25. - G7B11

For which of the following modes is a Class C power stage appropriate for amplifying a modulated signal?

Select	Answer
A	All of these choices are correct
B	SSB
C	AM
D	CW

26. - G7C02

Which circuit is used to combine signals from the carrier oscillator and speech amplifier then send the result to the filter in some single sideband phone transmitters?

Select	Answer
A	Detector
B	IF amplifier
C	Discriminator
D	Balanced modulator

27. - G8A01

How is an FSK signal generated?

Select	Answer
A	By keying an FM transmitter with a sub-audible tone
B	By reconfiguring the CW keying input to act as a tone generator
C	By changing an oscillator's frequency directly with a digital control signal
D	By using a transceiver's computer data interface protocol to change frequencies

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?

Select	Answer
A	Mixer
B	Reactance modulator
C	Multiplier
D	Pre-emphasis network

29. - G8C10

How does forward error correction (FEC) allow the receiver to correct errors in received data packets?

Select	Answer
A	By using the varicode character set
B	By using a parity bit with each character
C	By controlling transmitter output power for optimum signal strength
D	By transmitting redundant information with the data

30. - G9A07

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

Select	Answer
A	The feed line must be cut to a length equal to an odd number of electrical quarter wavelengths
B	The feed line must be cut to a length equal to an even number of physical half wavelengths
C	The antenna feed point must be at DC ground potential
D	The antenna feed point impedance must be matched to the characteristic impedance of the feed line

31. - G9B12

What is the approximate length for a 1/4 wave vertical antenna cut for 28.5 MHz?

Select	Answer
A	8 feet
B	16 feet
C	11 feet
D	21 feet

32. - G9C02

What is the approximate length of the driven element of a Yagi antenna?

Select	Answer
A	3/4 wavelength
B	1/2 wavelength
C	1 wavelength
D	1/4 wavelength

33. - G9D07

Which of the following describes a log periodic antenna?

Select	Answer
A	Length and spacing of the elements increase logarithmically from one end of the boom to the other
B	Gain varies logarithmically as a function of frequency
C	SWR varies periodically as a function of boom length
D	Impedance varies periodically as a function of frequency

34. - G0A12

What precaution should you take whenever you make adjustments or repairs to an antenna?

Select	Answer
A	Turn off the transmitter and disconnect the feed line
B	Wear a radiation badge
C	Ensure that you and the antenna structure are grounded
D	All of these choices are correct

35. - G0B12

What is the purpose of a power supply interlock?

Select	Answer
A	To shut down the unit if it becomes too hot
B	To prevent unauthorized changes to the circuit that would void the manufacturer's warranty
C	To shut off the power supply if too much voltage is produced
D	To ensure that dangerous voltages are removed if the cabinet is opened

Figure G7-1