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. - G1A03

On which of the following bands is image transmission prohibited?

Select	Answer
A	12 meters
B	20 meters
C	30 meters
D	160 meters

2. - G1B10

What is the power limit for beacon stations?

Select	Answer
A	200 watts PEP output
B	20 watts PEP output
C	100 watts PEP output
D	10 watts PEP output

3. - G1C07

What is the maximum symbol rate permitted for RTTY or data emission transmission on the 20-meter band?

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

4. - G1D10

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

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

5. - G1E03

What is required to conduct communications with a digital station operating under automatic control outside the automatic control band segments?

Select	Answer
A	The station initiating the contact must be under local or remote control
B	The control operator of the interrogating station must hold an Extra Class license
C	No third party traffic maybe be transmitted
D	The interrogating transmission must be made by another automatically controlled station

6. - G2A10

Which of the following statements is true of voice VOX operation versus PTT operation?

Select	Answer
A	It provides more power output
B	The received signal is more natural sounding
C	It occupies less bandwidth
D	It allows "hands free" operation

7. - G2B04

When selecting a CW transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies?

Select	Answer
A	150 to 500 Hz
B	5 to 50 Hz
C	3 to 6 kHz
D	1 to 3 kHz

8. - G2C09

What does the Q signal "QSL" mean?

Select	Answer
A	Send slower
B	We have worked before
C	I acknowledge receipt
D	We have already confirmed by card

9. - G2D06

How is a directional antenna pointed when making a "long-path" contact with another station?

Select	Answer
A	Toward the rising Sun
B	180 degrees from its short-path heading
C	Toward the north
D	Along the gray line

10. - G2E03

What symptoms may result from other signals interfering with a PACTOR or WINMOR transmission?

Select	Answer
A	Failure to establish a connection between stations
B	All of these choices are correct
C	Frequent retries or timeouts
D	Long pauses in message transmission

11. - G3A09

What effect does a high sunspot number have on radio communications?

Select	Answer
A	Frequencies above 300 MHz become usable for long-distance communication
B	Long-distance communication in the upper HF and lower VHF range is enhanced
C	Microwave communications become unstable
D	High-frequency radio signals become weak and distorted

12. - G3B12

What factor or factors affect the MUF?

Select	Answer
A	Path distance and location
B	Solar radiation and ionospheric disturbances
C	Time of day and season
D	All of these choices are correct

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

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. - G4B05

Why is high input impedance desirable for a voltmeter?

Select	Answer
A	It decreases the loading on circuits being measured
B	It decreases battery consumption in the meter
C	It improves the frequency response
D	It improves the resolution of the readings

16. - G4C06

What effect can be caused by a resonant ground connection?

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

17. - G4D10

How close to the lower edge of the 40-meter General Class phone segment should your displayed carrier frequency be when using 3 kHz wide LSB?

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

18. - G4E02

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

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

19. - G5A12

What is one reason to use an impedance matching transformer?

Select	Answer
A	To maximize the transfer of power
B	To minimize transmitter power output
C	To reduce power supply ripple
D	To minimize radiation resistance

20. - G5B11

What is the ratio of peak envelope power to average power for an unmodulated carrier?

Select	Answer
A	1.414
B	0.707
C	2.00
D	1.00

21. - G5C05

If three equal value resistors in series produce 450 ohms, what is the value of each resistor?

Select	Answer
A	175 ohms
B	90 ohms
C	1500 ohms
D	150 ohms

22. - G6A08

Why must the cases of some large power transistors be insulated from ground?

Select	Answer
A	To improve the power dissipation capability
B	To reduce stray capacitance
C	To increase the beta of the transistor
D	To avoid shorting the collector or drain voltage to ground

23. - G6B15

What is the main reason to use keyed connectors instead of non-keyed types?

Select	Answer
A	Reduced chance of incorrect mating
B	All of these choices are correct
C	Prevention of use by unauthorized persons
D	Higher current carrying capacity

24. - G7A08

Which of the following is an advantage of a switchmode power supply as compared to a linear power supply?

Select	Answer
A	All of these choices are correct
B	Fewer circuit components are required
C	Faster switching time makes higher output voltage possible
D	High frequency operation allows the use of smaller components

25. - G7B14

Which of the following describes a linear amplifier?

Select	Answer
A	Any RF power amplifier used in conjunction with an amateur transceiver
B	An amplifier in which the output preserves the input waveform
C	An amplifier used as a frequency multiplier
D	A Class C high efficiency amplifier

26. - G7C10

How is Digital Signal Processor filtering accomplished?

Select	Answer
A	By differential spurious phasing
B	By using direct signal phasing
C	By converting the signal from digital to analog and taking the difference of mixing products
D	By converting the signal from analog to digital and using digital processing

27. - G8A07

Which of the following phone emissions uses the narrowest bandwidth?

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

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	Pre-emphasis network
C	Multiplier
D	Mixer

29. - G8C01

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

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

30. - G9A01

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

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

31. - G9B02

Which of the following is a common way to adjust the feed point impedance of a quarter wave ground plane vertical antenna to be approximately 50 ohms?

Select	Answer
A	Slope the radials downward
B	Lengthen the radials
C	Shorten the radials
D	Slope the radials upward

32. - G9C04

Which statement about a three-element, single-band Yagi antenna is true?

Select	Answer
A	The reflector is normally the shortest element
B	The reflector is normally the longest element
C	All of the elements must be the same length
D	The director is normally the longest element

33. - G9D02

Which of the following is an advantage of an NVIS antenna?

Select	Answer
A	All of these choices are correct
B	High forward gain
C	Low vertical angle radiation for working stations out to ranges of several thousand kilometers
D	High vertical angle radiation for working stations within a radius of a few hundred kilometers

34. - G0A12

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

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

35. - G0B14

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

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