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. - G1A06

Which of the following frequencies is within the General Class portion of the 75-meter phone band?

Select	Answer
A	3750 kHz
B	4005 kHz
C	1875 kHz
D	3900 kHz

2. - G1B12

Who or what determines "good engineering and good amateur practice" as applied to the operation of an amateur station in all respects not covered by the Part 97 rules?

Select	Answer
A	The IEEE
B	The Control Operator
C	The ITU
D	The FCC

3. - G1C06

Which of the following is a limitation on transmitter power on the 1.8 MHz band?

Select	Answer
A	1500 watts PEP output
B	1200 watts PEP output
C	200 watts PEP output
D	1000 watts PEP output

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

6. - G2A09

Why do most amateur stations use lower sideband on the 160-meter, 75-meter and 40-meter bands?

Select	Answer
A	Lower sideband is more efficient than upper sideband at these frequencies
B	Because it is fully compatible with an AM detector
C	Lower sideband is the only sideband legal on these frequency bands
D	Current amateur practice is to use lower sideband on these frequency bands

7. - G2B08

What is the "DX window" in a voluntary band plan?

Select	Answer
A	An FCC rule that prohibits contacts between stations within the United States and possessions in that portion of the band
B	An FCC rule that allows only digital contacts in that portion of the band
C	A portion of the band that should not be used for contacts between stations within the 48 contiguous United States
D	A portion of the band that has been voluntarily set aside for digital contacts only

8. - G2C07

When sending CW, what does a "C" mean when added to the RST report?

Select	Answer
A	Chirpy or unstable signal
B	Report was read from an S meter rather than estimated
C	100 percent copy
D	Key clicks

9. - G2D07

Which of the following is required by the FCC rules when operating in the 60-meter band?

Select	Answer
A	You must keep a record of all third party traffic
B	You must keep a record of the manufacturer of your equipment and the antenna used
C	If you are using other than a dipole antenna, you must keep a record of the gain of your antenna
D	You must keep a record of the date, time, frequency, power level and stations worked

10. - G2E01

Which mode is normally used when sending an RTTY signal via AFSK with an SSB transmitter?

Select	Answer
A	USB
B	LSB
C	DSB
D	CW

11. - G3A13

What does the A-index indicate?

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

12. - G3B06

What usually happens to radio waves with frequencies below the LUF?

Select	Answer
A	They are completely absorbed by the ionosphere
B	They pass through the ionosphere
C	They are bent back to the Earth
D	They are bent and trapped in the ionosphere to circle the Earth

13. - G3C08

Why are HF scatter signals in the skip zone usually weak?

Select	Answer
A	Signals are scattered from the magnetosphere which is not a good reflector
B	Propagation is through ground waves which absorb most of the signal energy
C	Propagations is through ducts in F region which absorb most of the energy
D	Only a small part of the signal energy is scattered into the skip zone

14. - G4A08

What is the correct adjustment for the load or coupling control of a vacuum tube RF power amplifier?

Select	Answer
A	Minimum SWR on the antenna
B	Minimum plate current without exceeding maximum allowable grid current
C	Maximum power output without exceeding maximum allowable plate current
D	Highest plate voltage while minimizing grid current

15. - G4B11

Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements?

Select	Answer
A	Transmitter
B	Antenna and feed line
C	All of these choices are correct
D	Receiver

16. - G4C13

Which of the following can perform automatic notching of interfering carriers?

Select	Answer
A	A Digital Signal Processor (DSP) filter
B	A noise limiter
C	Bandpass tuning
D	Balanced mixing

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

18. - G4E09

What is the approximate open-circuit voltage from a fully illuminated silicon photovoltaic cell?

Select	Answer
A	1.38 VDC
B	0.5 VDC
C	0.2 VDC
D	0.02 VDC

19. - G5A08

Why is impedance matching important?

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

20. - G5B07

What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?

Select	Answer
A	The reciprocal of the RMS value
B	The peak value
C	The peak-to-peak value
D	The RMS value

21. - G5C08

What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?

Select	Answer
A	10.750 nanofarads
B	1733 picofarads
C	3583 picofarads
D	576.9 nanofarads

22. - G6A05

What is the approximate junction threshold voltage of a conventional silicon diode?

Select	Answer
A	0.1 volt
B	0.7 volts
C	0.3 volts
D	1.0 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 high temperatures
C	It is resistant to radiation damage
D	The stored information is maintained even if power is removed

24. - G7A07

What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

Select	Answer
A	A series of DC pulses at twice the frequency of the AC input
B	A steady DC voltage
C	A series of DC pulses at the same frequency as the AC input
D	A sine wave at half the frequency of the AC input

25. - G7B08

How is the efficiency of an RF power amplifier determined?

Select	Answer
A	Multiply the RF input power by the reciprocal of the RF output power
B	Divide the RF output power by the DC input power
C	Divide the DC input power by the DC output power
D	Add the RF input power to the DC output power

26. - G7C04

What circuit is used to combine signals from the IF amplifier and BFO and send the result to the AF amplifier in some single sideband receivers?

Select	Answer
A	IF filter
B	Balanced modulator
C	RF oscillator
D	Product detector

27. - G8A10

What is meant by the term flat-topping when referring to a single sideband phone transmission?

Select	Answer
A	Signal distortion caused by excessive drive
B	Signal distortion caused by insufficient collector current
C	The transmitter's carrier is properly suppressed
D	The transmitter's automatic level control (ALC) is properly adjusted

28. - G8B01

What receiver stage combines a 14.250 MHz input signal with a 13.795 MHz oscillator signal to produce a 455 kHz intermediate frequency (IF) signal?

Select	Answer
A	Mixer
B	BFO
C	VFO
D	Discriminator

29. - G8C01

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

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

30. - G9A10

What standing wave ratio will result when connecting a 50 ohm feed line to a non-reactive load having 10 ohm impedance?

Select	Answer
A	5:1
B	1:5
C	50:1
D	2:1

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?

Select	Answer
A	It steadily increases
B	It is unaffected by the height above ground
C	It steadily decreases
D	It peaks at about 1/8 wavelength above ground

32. - G9C02

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

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

33. - G9D03

At what height above ground is an NVIS antenna typically installed?

Select	Answer
A	Height is not critical as long as it is significantly more than 1/2 wavelength
B	Between 1/10 and 1/4 wavelength
C	As close to one wavelength as possible
D	As close to 1/2 wavelength as possible

34. - G0A04

What does "time averaging" mean in reference to RF radiation exposure?

Select	Answer
A	The average time it takes RF radiation to have any long-term effect on the body
B	The total time of the exposure
C	The average amount of power developed by the transmitter over a specific 24 hour period
D	The total RF exposure averaged over a certain time

35. - G0B06

Why must the metal enclosure of every item of station equipment be grounded?

Select	Answer
A	It ensures that hazardous voltages cannot appear on the chassis
B	It ensures that the neutral wire is grounded
C	It prevents a blown fuse in the event of an internal short circuit
D	It prevents signal overload