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. - G1A10

Which of the following frequencies is available to a control operator holding a General Class license?

Select	Answer
A	28.020 MHz
B	All of these choices are correct
C	28.350 MHz
D	28.550 MHz

2. - G1B06

When is an amateur station permitted to transmit secret codes?

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

3. - G1C05

Which of the following is a limitation on transmitter power on the 28 MHz band for a General Class control operator?

Select	Answer
A	2000 watts PEP output
B	1000 watts PEP output
C	100 watts PEP output
D	1500 watts PEP output

4. - G1D07

Volunteer Examiners are accredited by what organization?

Select	Answer
A	The Wireless Telecommunications Bureau
B	A Volunteer Examiner Coordinator
C	The Universal Licensing System
D	The Federal Communications Commission

5. - G1E07

With which foreign countries is third party traffic prohibited, except for messages directly involving emergencies or disaster relief communications?

Select	Answer
A	Countries in ITU Region 1
B	Any country which is not a member of the International Amateur Radio Union (IARU)
C	Every foreign country, unless there is a third party agreement in effect with that country
D	Countries in ITU Region 2

6. - G2A06

Which of the following is an advantage when using single sideband as compared to other analog voice modes on the HF amateur bands?

Select	Answer
A	Less bandwidth used and greater power efficiency
B	Ease of tuning on receive and immunity to impulse noise
C	Very high fidelity voice modulation
D	Less subject to interference from atmospheric static crashes

7. - G2B03

If propagation changes during your contact and you notice increasing interference from other activity on the same frequency, what should you do?

Select	Answer
A	Report the interference to your local Amateur Auxiliary Coordinator
B	As a common courtesy, move your contact to another frequency
C	Increase power to overcome interference
D	Tell the interfering stations to change frequency

8. - G2C06

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

Select	Answer
A	Operating split to avoid interference on frequency
B	Matching your transmit frequency to the frequency of a received signal
C	Sending without error
D	Matching the speed of the transmitting station

9. - G2D08

What is a reason why many amateurs keep a station log?

Select	Answer
A	The ITU requires a log of all international contacts
B	The log provides evidence of operation needed to renew a license without retest
C	The ITU requires a log of all international third party traffic
D	To help with a reply if the FCC requests information

10. - G2E04

What segment of the 20-meter band is most often used for digital transmissions?

Select	Answer
A	14.070 - 14.100 MHz
B	14.275 - 14.350 MHz
C	14.150 - 14.225 MHz
D	14.000 - 14.050 MHz

11. - G3A12

What does the K-index indicate?

Select	Answer
A	The relative position of sunspots on the surface of the Sun
B	The short term stability of the Earth's magnetic field
C	The solar radio flux at Boulder, Colorado
D	The stability of the Sun's magnetic field

12. - G3B02

Which of the following is a good indicator of the possibility of sky-wave propagation on the 6-meter band?

Select	Answer
A	Severe attenuation of signals on the 10-meter band
B	Short skip sky-wave propagation on the 10-meter band
C	Long skip sky-wave propagation on the 10-meter band
D	Long delayed echoes on the 10-meter band

13. - G3C07

What makes HF scatter signals often sound distorted?

Select	Answer
A	The E-region is not present
B	Ground waves are absorbing much of the signal
C	The ionospheric layer involved is unstable
D	Energy is scattered into the skip zone through several different radio wave paths

14. - G4A12

Which of the following is a common use for the dual VFO feature on a transceiver?

Select	Answer
A	To allow transmitting on two frequencies at once
B	To permit monitoring of two different frequencies
C	To facilitate computer interface
D	To permit full duplex operation, that is transmitting and receiving at the same time

15. - G4B13

What is a use for an antenna analyzer other than measuring the SWR of an antenna system?

Select	Answer
A	Determining the gain of a directional antenna
B	Measuring the front to back ratio of an antenna
C	Determining the impedance of an unknown or unmarked coaxial cable
D	Measuring the turns ratio of a power transformer

16. - G4C01

Which of the following might be useful in reducing RF interference to audio frequency devices?

Select	Answer
A	Bypass inductor
B	Forward-biased diode
C	Bypass capacitor
D	Reverse-biased diode

17. - G4D06

Where is an S meter found?

Select	Answer
A	In an SWR bridge
B	In a receiver
C	In a transmitter
D	In a conductance bridge

18. - G4E04

Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle's auxiliary power socket?

Select	Answer
A	The socket's wiring may be inadequate for the current drawn by the transceiver
B	The socket is not wired with an RF-shielded power cable
C	Drawing more than 50 watts from this socket could cause the engine to overheat
D	The DC polarity of the socket is reversed from the polarity of modern HF transceivers

19. - G5A03

Which of the following causes opposition to the flow of alternating current in an inductor?

Select	Answer
A	Conductance
B	Reluctance
C	Reactance
D	Admittance

20. - G5B06

What is the output PEP from a transmitter if an oscilloscope measures 200 volts peak-to-peak across a 50 ohm dummy load connected to the transmitter output?

Select	Answer
A	400 watts
B	1.4 watts
C	100 watts
D	353.5 watts

21. - G5C01

What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

Select	Answer
A	Displacement current coupling
B	Capacitive coupling
C	Mutual inductance
D	Mutual capacitance

22. - G6A12

What is the primary purpose of a screen grid in a vacuum tube?

Select	Answer
A	To decrease plate resistance
B	To reduce grid-to-plate capacitance
C	To increase efficiency
D	To increase the control grid resistance

23. - G6B07

Which of the following is an advantage of an LED indicator compared to an incandescent indicator?

Select	Answer
A	Longer life
B	Faster response time
C	Lower power consumption
D	All of these choices are correct

24. - G7A03

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

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

25. - G7B03

Which of the following describes the function of a two input AND gate?

Select	Answer
A	Output is low only when both inputs are high
B	Output is high when either or both inputs are low
C	Output is high only when both inputs are high
D	Output is low when either or both inputs are high

26. - G7C08

What type of circuit is used in many FM receivers to convert signals coming from the IF amplifier to audio?

Select	Answer
A	Product detector
B	Discriminator
C	Phase inverter
D	Mixer

27. - G8A11

What is the modulation envelope of an AM signal?

Select	Answer
A	The waveform created by connecting the peak values of the modulated signal
B	Spurious signals that envelop nearby frequencies
C	The carrier frequency that contains the signal
D	The 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?

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

29. - G8C03

What part of a data packet contains the routing and handling information?

Select	Answer
A	Preamble
B	Header
C	Directory
D	Footer

30. - G9A08

If the SWR on an antenna feed line is 5 to 1, and a matching network at the transmitter end of the feed line is adjusted to 1 to 1 SWR, what is the resulting SWR on the feed line?

Select	Answer
A	1 to 1
B	Between 1 to 1 and 5 to 1 depending on the characteristic impedance of the line
C	Between 1 to 1 and 5 to 1 depending on the reflected power at the transmitter
D	5 to 1

31. - G9B08

How does the feed point impedance of a 1/2 wave dipole change as the feed point is moved from the center toward the ends?

Select	Answer
A	It steadily increases
B	It peaks at about 1/8 wavelength from the end
C	It is unaffected by the location of the feed point
D	It steadily decreases

32. - G9C02

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

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

33. - G9D07

Which of the following describes a log periodic antenna?

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

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?

Select	Answer
A	Use an antenna with a higher front-to-back ratio
B	Take precautions to ensure that the antenna cannot be pointed in their direction
C	Post a warning sign that is clearly visible to the neighbor
D	Change to a non-polarized antenna with higher gain

35. - G0B14

Which of the following is covered by the National Electrical Code?

Select	Answer
A	Acceptable bandwidth limits
B	Acceptable modulation limits
C	Electrical safety inside the ham shack
D	RF exposure limits of the human body