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	1875 kHz
B	3750 kHz
C	4005 kHz
D	3900 kHz

2. - G1B09

When may an amateur station transmit communications in which the licensee or control operator has a pecuniary (monetary) interest?

Select	Answer
A	Never
B	When other amateurs are being notified of the sale of any item with a monetary value less than $200 and such activity is not done on a regular basis
C	When other amateurs are being notified of the sale of apparatus normally used in an amateur station and such activity is not done on a regular basis
D	Only when there is no other means of communications readily available

3. - G1C01

What is the maximum transmitting power an amateur station may use on 10.140 MHz?

Select	Answer
A	1500 watts PEP output
B	2000 watts PEP output
C	200 watts PEP output
D	1000 watts PEP output

4. - G1D05

Which of the following must a person have before they can be an administering VE for a Technician Class license examination?

Select	Answer
A	An FCC General Class or higher license and VEC accreditation
B	Possession of a properly obtained telegraphy license
C	Receipt of a CSCE for General Class
D	Notification to the FCC that you want to give an examination

5. - G1E13

On what bands may automatically controlled stations transmitting RTTY or data emissions communicate with other automatically controlled digital stations?

Select	Answer
A	Only in the non-phone Extra Class segments of the bands
B	Anywhere in the non-phone segments of the 10-meter or shorter wavelength bands
C	On any band segment where digital operation is permitted
D	Anywhere in the 1.25-meter or shorter wavelength bands, and in specified segments of the 80-meter through 2-meter bands

6. - G2A05

Which mode of voice communication is most commonly used on the HF amateur bands?

Select	Answer
A	Double sideband
B	Phase modulation
C	Frequency modulation
D	Single sideband

7. - G2B10

When may the FCC restrict normal frequency operations of amateur stations participating in RACES?

Select	Answer
A	When they declare a temporary state of communication emergency
B	When the President's War Emergency Powers have been invoked
C	Only when all amateur stations are instructed to stop transmitting
D	When they seize your equipment for use in disaster communications

8. - G2C05

What is the best speed to use when answering a CQ in Morse code?

Select	Answer
A	The speed at which the CQ was sent
B	A slow speed until contact is established
C	The fastest speed at which you are comfortable copying
D	At the standard calling speed of 5 wpm

9. - G2D02

Which of the following are objectives of the Amateur Auxiliary?

Select	Answer
A	To coordinate repeaters for efficient and orderly spectrum usage
B	To provide emergency and public safety communications
C	To encourage self-regulation and compliance with the rules by radio amateur operators
D	To conduct efficient and orderly amateur licensing examinations

10. - G2E12

Which of the following describes a waterfall display?

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

11. - G3A12

What does the K-index indicate?

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

12. - G3B05

What usually happens to radio waves with frequencies below the MUF and above the LUF when they are sent into the ionosphere?

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

13. - G3C07

What makes HF scatter signals often sound distorted?

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

14. - G4A09

Why is a time delay sometimes included in a transmitter keying circuit?

Select	Answer
A	To allow time for a warning signal to be sent to other stations
B	To allow time for transmit-receive changeover operations to complete properly before RF output is allowed
C	To allow the transmitter power regulators to charge properly
D	To prevent stations from interfering with one another

15. - G4B02

Which of the following is an advantage of an oscilloscope versus a digital voltmeter?

Select	Answer
A	Input impedance is much lower
B	Complex waveforms can be measured
C	An oscilloscope uses less power
D	Complex impedances can be easily measured

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	Install a few ferrite beads on the ground wire where it connects to your station
C	Use a ground loop for best conductivity
D	Connect all equipment grounds together

17. - G4D04

What does an S meter measure?

Select	Answer
A	Transmitter power output
B	Conductance
C	Impedance
D	Received signal strength

18. - G4E02

What is the purpose of a corona ball on a HF mobile antenna?

Select	Answer
A	To increase the "Q" of the antenna
B	To reduce high voltage discharge from the tip of the antenna
C	To reduce the chance of damage if the antenna should strike an object
D	To narrow the operating bandwidth of the antenna

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. - G5B02

How does the total current relate to the individual currents in each branch of a purely resistive parallel circuit?

Select	Answer
A	It decreases as more parallel branches are added to the circuit
B	It is the sum of the reciprocal of each individual voltage drop
C	It equals the average of each branch current
D	It equals the sum of the currents through each branch

21. - G5C02

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

Select	Answer
A	Additional resistance must be added in parallel with the secondary to prevent overload
B	Additional resistance must be added in series with the primary to prevent overload
C	The transformer no longer functions as it is a unidirectional device
D	The secondary voltage becomes 4 times the primary voltage

22. - G6A10

Which element of a triode vacuum tube is used to regulate the flow of electrons between cathode and plate?

Select	Answer
A	Heater
B	Control grid
C	Screen Grid
D	Trigger electrode

23. - G6B11

What is a microprocessor?

Select	Answer
A	A microwave detector, amplifier, and local oscillator on a single integrated circuit
B	A low power analog signal processor used as a microwave detector
C	A computer on a single integrated circuit
D	A low voltage amplifier used in a microwave transmitter modulator stage

24. - G7A06

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

Select	Answer
A	270 degrees
B	90 degrees
C	180 degrees
D	360 degrees

25. - G7B08

How is the efficiency of an RF power amplifier determined?

Select	Answer
A	Divide the DC input power by the DC output power
B	Divide the RF output power by the DC input power
C	Add the RF input power to the DC output power
D	Multiply the RF input power by the reciprocal of the RF 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	RF oscillator
B	Balanced modulator
C	Product detector
D	IF filter

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 conversion
B	Frequency transformation
C	Frequency modulation
D	Frequency convolution

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	Discriminator
B	Mixer
C	BFO
D	VFO

29. - G8C08

Which of the following statements is true about PSK31?

Select	Answer
A	Upper case letters use longer Varicode signals and thus slow down transmission
B	Varicode Error Correction is used to ensure accurate message reception
C	Higher power is needed as compared to RTTY for similar error rates
D	Upper case letters make the signal stronger

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 distance between the centers of the conductors and the length of the line
C	The distance between the centers of the conductors and the radius of the conductors
D	The radius of the conductors and the frequency of the signal

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

32. - G9C08

What is meant by the "main lobe" of a directive antenna?

Select	Answer
A	The direction of maximum radiated field strength from the antenna
B	The magnitude of the maximum vertical angle of radiation
C	The maximum voltage standing wave point on a radiating element
D	The point of maximum current in a radiating antenna element

33. - G9D09

Which of the following is an application for a Beverage antenna?

Select	Answer
A	Directional transmitting for low HF bands
B	Portable direction finding at lower HF frequencies
C	Portable direction finding at higher HF frequencies
D	Directional receiving for low HF bands

34. - G0A09

What type of instrument can be used to accurately measure an RF field?

Select	Answer
A	An oscilloscope with a high-stability crystal marker generator
B	A receiver with an S meter
C	A calibrated field strength meter with a calibrated antenna
D	An SWR meter with a peak-reading function

35. - G0B08

What should be done by any person preparing to climb a tower that supports electrically powered devices?

Select	Answer
A	Unground the base of the tower
B	All of these choices are correct
C	Make sure all circuits that supply power to the tower are locked out and tagged
D	Notify the electric company that a person will be working on the tower