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	14250 kHz
B	21300 kHz
C	18155 kHz
D	24900 kHz

2. - G1B02

With which of the following conditions must beacon stations comply?

Select	Answer
A	The frequency must be coordinated with the National Beacon Organization
B	The frequency must be posted on the Internet or published in a national periodical
C	A beacon station may not use automatic control
D	There must be no more than one beacon signal transmitting in the same band from the same station location

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	56 kilobaud
B	300 baud
C	19.6 kilobaud
D	1200 baud

4. - G1D10

What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?

Select	Answer
A	12 years
B	18 years
C	There is no age limit
D	21 years

5. - G1E11

Which of the following is the FCC term for an unattended digital station that transfers messages to and from the Internet?

Select	Answer
A	Automatically controlled digital station
B	Fail-safe digital station
C	Locally controlled station
D	Robotically controlled station

6. - G2A04

Which mode is most commonly used for voice communications on the 17-meter and 12-meter bands?

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

7. - G2B11

What frequency should be used to send a distress call?

Select	Answer
A	Only frequencies authorized for RACES or ARES stations
B	Only frequencies used by police, fire or emergency medical services
C	Only frequencies that are within your operating privileges
D	Whichever frequency has the best chance of communicating the distress message

8. - G2C11

What does the Q signal "QRV" mean?

Select	Answer
A	There is interference on the frequency
B	You are sending too fast
C	I am ready to receive messages
D	I am quitting for the day

9. - G2D10

What is QRP operation?

Select	Answer
A	Remote piloted model control
B	Low power transmit operation
C	Traffic relay procedure net operation
D	Transmission using Quick Response Protocol

10. - G2E12

Which of the following describes a waterfall display?

Select	Answer
A	Frequency is horizontal, signal strength is intensity, time is vertical
B	Frequency is horizontal, signal strength is vertical, time is intensity
C	Frequency is vertical, signal strength is intensity, time is horizontal
D	Frequency is vertical, signal strength is horizontal, time is intensity

11. - G3A16

What is a possible benefit to radio communications resulting from periods of high geomagnetic activity?

Select	Answer
A	Reduced long delayed echoes
B	Higher signal strength for HF signals passing through the polar regions
C	Auroras that can reflect VHF signals
D	Improved HF long path propagation

12. - G3B04

What is a reliable way to determine if the MUF is high enough to support skip propagation between your station and a distant location on frequencies between 14 and 30 MHz?

Select	Answer
A	Check the strength of signals in the MF AM broadcast band
B	Check the strength of TV signals from Western Europe
C	Send a series of dots on the band and listen for echoes from your signal
D	Listen for signals from an international beacon in the frequency range you plan to use

13. - G3C02

Where on the Earth do ionospheric layers reach their maximum height?

Select	Answer
A	Where the Sun is rising
B	Where the Sun is on the opposite side of the Earth
C	Where the Sun has just set
D	Where the Sun is overhead

14. - G4A13

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

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

15. - G4B04

What signal source is connected to the vertical input of an oscilloscope when checking the RF envelope pattern of a transmitted signal?

Select	Answer
A	The local oscillator of the transmitter
B	An external RF oscillator
C	The attenuated RF output of the transmitter
D	The transmitter balanced mixer output

16. - G4C07

What is one good way to avoid unwanted effects of stray RF energy in an amateur station?

Select	Answer
A	Install an RF filter in series with the ground wire
B	Connect all equipment grounds together
C	Install a few ferrite beads on the ground wire where it connects to your station
D	Use a ground loop for best conductivity

17. - G4D08

What frequency range is occupied by a 3 kHz LSB signal when the displayed carrier frequency is set to 7.178 MHz?

Select	Answer
A	7.178 to 7.184 MHz
B	7.178 to 7.181 MHz
C	7.175 to 7.178 MHz
D	7.1765 to 7.1795 MHz

18. - G4E03

Which of the following direct, fused power connections would be the best for a 100 watt HF mobile installation?

Select	Answer
A	To the alternator or generator using heavy gauge wire
B	To the alternator or generator using resistor wire
C	To the battery using resistor wire
D	To the battery using heavy gauge wire

19. - G5A13

Which of the following devices can be used for impedance matching at radio frequencies?

Select	Answer
A	A Pi-network
B	A length of transmission line
C	A transformer
D	All of these choices are correct

20. - G5B03

How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load?

Select	Answer
A	3200 watts
B	200 watts
C	0.5 watts
D	400 watts

21. - G5C13

Which of the following components should be added to a capacitor to increase the capacitance?

Select	Answer
A	A capacitor in series
B	A capacitor in parallel
C	An inductor in series
D	A resistor in series

22. - G6A01

What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead acid battery?

Select	Answer
A	6 volts
B	8.5 volts
C	12 volts
D	10.5 volts

23. - G6B05

What is meant when memory is characterized as non-volatile?

Select	Answer
A	The stored information cannot be changed once written
B	It is resistant to radiation damage
C	The stored information is maintained even if power is removed
D	It is resistant to high temperatures

24. - G7A03

What is the peak-inverse-voltage across the rectifiers in a full-wave bridge power supply?

Select	Answer
A	Half the normal output voltage of the power supply
B	Equal to the normal peak output voltage of the power supply
C	One-quarter the normal output voltage of the power supply
D	Double the normal peak output voltage of the power supply

25. - G7B10

Which of the following is a characteristic of a Class A amplifier?

Select	Answer
A	No need for bias
B	High Efficiency
C	Low distortion
D	Low standby power

26. - G7C07

What is the simplest combination of stages that implement a superheterodyne receiver?

Select	Answer
A	HF oscillator, prescaler, audio amplifier
B	RF amplifier, detector, audio amplifier
C	RF amplifier, mixer, IF discriminator
D	HF oscillator, mixer, detector

27. - G8A03

What is the name of the process that changes the instantaneous frequency of an RF wave to convey information?

Select	Answer
A	Frequency transformation
B	Frequency modulation
C	Frequency convolution
D	Frequency conversion

28. - G8B09

Why is it good to match receiver bandwidth to the bandwidth of the operating mode?

Select	Answer
A	It improves impedance matching of the antenna
B	It minimizes power consumption in the receiver
C	It is required by FCC rules
D	It results in the best signal to noise ratio

29. - G8C01

Which of the following digital modes is designed to operate at extremely low signal strength on the HF bands?

Select	Answer
A	FSK441 and Hellschreiber
B	JT9 and JT65
C	Clover
D	RTTY

30. - G9A01

Which of the following factors determine the characteristic impedance of a parallel conductor antenna feed line?

Select	Answer
A	The frequency of the signal and the length of the line
B	The radius of the conductors and the frequency of the signal
C	The distance between the centers of the conductors and the radius of the conductors
D	The distance between the centers of the conductors and the length of the line

31. - G9B09

Which of the following is an advantage of a horizontally polarized as compared to a vertically polarized HF antenna?

Select	Answer
A	Lower ground reflection losses
B	Lower feed point impedance
C	Lower radiation resistance
D	Shorter Radials

32. - G9C10

Which of the following is a Yagi antenna design variable that could be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth?

Select	Answer
A	The physical length of the boom
B	The spacing of each element along the boom
C	All of these choices are correct
D	The number of elements on the boom

33. - G9D05

What is an advantage of vertical stacking of horizontally polarized Yagi antennas?

Select	Answer
A	It narrows the main lobe in azimuth
B	It allows quick selection of vertical or horizontal polarization
C	It allows simultaneous vertical and horizontal polarization
D	It narrows the main lobe in elevation

34. - G0A07

What effect does transmitter duty cycle have when evaluating RF exposure?

Select	Answer
A	A lower transmitter duty cycle permits greater short-term exposure levels
B	High duty cycle transmitters are exempt from RF exposure requirements
C	A higher transmitter duty cycle permits greater short-term exposure levels
D	Low duty cycle transmitters are exempt from RF exposure evaluation requirements

35. - G0B10

Which of the following is a danger from lead-tin solder?

Select	Answer
A	RF energy can convert the lead into a poisonous gas
B	Tin in the solder can "cold flow" causing shorts in the circuit
C	Lead can contaminate food if hands are not washed carefully after handling the solder
D	High voltages can cause lead-tin solder to disintegrate suddenly