&General question pool, November 1990 (element 3B)
+
+ for General exams given on or after November 1, 1990
+
+Note: This question pool has not been proof-read.
+
; Number of sections (sub-elements)
% 9
; Number of questions in each section
* 46 35 30 50 41 11 10 22 42
; Number of questions from each section to build exam
@ 4 3 3 5 2 1 1 2 4
; Required number of correct questions to pass exam
$ 19
! 1 ;SUBELEMENT 3BA -- Rules and Regulations (4 questions)
;1 A 3A-3.2
#What is the maximum transmitting power permitted an amateur station on 10.14-MHz?
200 watts PEP output
1000 watts DC input
1500 watts PEP output
2000 watts DC input
;2. A 3A-3.3
#What is the maximum transmitting power permitted an amateur station on 3725-kHz?
200 watts PEP output
1000 watts DC input
1500 watts PEP output
2000 watts DC input
;3. C 3A-3.4
#What is the maximum transmitting power permitted an amateur station on 7080-kHz?
1500 watts PEP output
200 watts PEP output
1000 watts DC input
2000 watts DC input
;4. C 3A-3.5
#What is the maximum transmitting power permitted an amateur station on 24.95-MHz?
1500 watts PEP output
200 watts PEP output
1000 watts DC input
2000 watts DC input
;5. A 3A-3.7
#What is the maximum transmitting power permitted an amateur station transmitting on 21.150-MHz?
200 watts PEP output
1000 watts DC input
1500 watts DC input
1500 watts PEP output
;6. C 3A-4.1
#How must a General control operator at a Novice station make the station identification when transmitting on 7050-kHz?
The control operator should identify the station with the Novice call, followed by the slant bar "/" and his or her own call
The control operator should identify the station with his or her call, followed by the word "controlling" and the Novice call
The control operator should identify the station with his or her call, followed by the slant bar "/" and the Novice call
A Novice station should not be operated on 7050 kHz, even with a General class control operator
;7. C 3A-4.3
#How must a newly-upgraded General control operator with a Certificate of Successful Completion of Examination identify the station when transmitting on 14.325-MHz pending the receipt of a new operator license?
The operator shall give his/her call sign, followed by the words "temporary" and the two-letter ID code shown on the Certificate of Successful Completion of Examination
General-class privileges do not include 14.325 MHz
No special form of identification is needed
The operator shall give his/her call sign, followed by the date and location of the VEC examination where he/she obtained the upgraded license
;8. B 3A-6.1
#Under what circumstances, if any, may third-party traffic be transmitted to a foreign country by an amateur station?
Only if the country has a third-party traffic agreement with the United States
Under no circumstances
Only if the control operator is an Amateur Extra class licensee
Only if the country has formal diplomatic relations with the United States
;9. C 3A-6.2
#What types of messages may be transmitted by an amateur station to a foreign country for a third-party?
Only third-party traffic which does not involve material compensation of any kind, and is not business communication of any type
Third-party traffic involving material compensation, either tangible or intangible, direct or indirect, to a third party, a station licensee, a control operator, or any other person
Third-party traffic consisting of business communications on behalf of any party
No messages may be transmitted to foreign countries for third parties
;10. A 3A-6.6
#What additional limitations apply to third-party messages transmitted to foreign countries?
Third-party messages may only be transmitted to amateurs in countries with which the US has a third-party traffic agreement
Third-party messages may only be sent to amateurs in ITU Region 1
Third-party messages may only be sent to amateurs in ITU Region 3
Third-party messages must always be transmitted in English
;11. D 3A-8.6
#Under what circumstances, if any, may an amateur station transmitting on 29.64-MHz repeat the 146.34-MHz signals of an amateur station with a Technician control operator?
Only if the control operator of the repeater transmitter is authorized to operate on 29.64 MHz
Under no circumstances
Only if the station on 29.64 MHz is operating under a Special Temporary Authorization allowing such retransmission
Only during an FCC-declared general state of communications emergency
;12. C 3A-9.1
#What frequency privileges are authorized to General operators in the 160 meter band?
1800 to 2000 kHz only
1800 to 1900 kHz only
1900 to 2000 kHz only
1825 to 2000 kHz only
;13. A 3A-9.2
#What frequency privileges are authorized to General operators in the 75/80 meter band?
3525 to 3750 and 3850 to 4000 kHz only
3525 to 3775 and 3875 to 4000 kHz only
3525 to 3750 and 3875 to 4000 kHz only
3525 to 3775 and 3850 to 4000 kHz only
;14. D 3A-9.3
#What frequency privileges are authorized to General operators in the 40 meter band?
7025 to 7150 and 7225 to 7300 kHz only
7025 to 7175 and 7200 to 7300 kHz only
7025 to 7175 and 7225 to 7300 kHz only
7025 to 7150 and 7200 to 7300 kHz only
;15. A 3A-9.4
#What frequency privileges are authorized to General operators in the 30 meter band?
10,100 to 10,150 kHz only
10,105 to 10,150 kHz only
10,125 to 10,150 kHz only
10,100 to 10,125 kHz only
;16. B 3A-9.5
#What frequency privileges are authorized to General operators in the 20 meter band?
14,025 to 14,150 and 14,225 to 14,350 kHz only
14,025 to 14,100 and 14,175 to 14,350 kHz only
14,025 to 14,125 and 14,200 to 14,350 kHz only
14,025 to 14,175 and 14,250 to 14,350 kHz only
;17. C 3A-9.6
#What frequency privileges are authorized to General operators in the 15 meter band?
21,025 to 21,200 and 21,300 to 21,450 kHz only
21,025 to 21,200 and 21,275 to 21,450 kHz only
21,025 to 21,150 and 21,300 to 21,450 kHz only
21,000 to 21,150 and 21,275 to 21,450 kHz only
;18. A 3A-9.7
#What frequency privileges are authorized to General operators in the 12 meter band?
24,890 to 24,990 kHz only
24,890 to 24,975 kHz only
24,900 to 24,990 kHz only
24,790 to 24,990 kHz only
;19. A 3A-9.8
#What frequency privileges are authorized to General operators in the 10 meter band?
28,000 to 29,700 kHz only
28,025 to 29,700 kHz only
28,100 to 29,700 kHz only
28,025 to 29,600 kHz only
;20. C 3A-9.9
#Which operator licenses authorize privileges on 1820-kHz?
Extra, Advanced, General only
Extra only
Extra, Advanced only
Extra, Advanced, General, Technician only
;21. B 3A-9.10
#Which operator licenses authorize privileges on 3950-kHz?
Extra, Advanced, General only
Extra, Advanced only
Extra, Advanced, General, Technician only
Extra, Advanced, General, Technician, Novice
;22. C 3A-9.11
#Which operator licenses authorize privileges on 7230-kHz?
Extra, Advanced, General only
Extra only
Extra, Advanced only
Extra, Advanced, General, Technician only
;23. A 3A-9.12
#Which operator licenses authorize privileges on 10.125-MHz?
Extra, Advanced, General only
Extra, Advanced only
Extra only
Technician only
;24. B 3A-9.13
#Which operator licenses authorize privileges on 14.325-MHz?
Extra, Advanced, General only
Extra, Advanced, General, Technician only
Extra, Advanced only
Extra only
;25. C 3A-9.14
#Which operator licenses authorize privileges on 21.425-MHz?
Extra, Advanced, General only
Extra, Advanced, General, Novice only
Extra, Advanced, General, Technician only
Extra, Advanced only
;26. C 3A-9.15
#Which operator licenses authorize privileges on 24.895-MHz?
Extra, Advanced, General only
Extra only
Extra, Advanced only
None
;27. C 3A-9.16
#Which operator licenses authorize privileges on 29.616-MHz?
General, Advanced, Extra only
Novice, Technician, General, Advanced, Extra
Technician, General, Advanced, Extra only
Advanced, Extra only
;28. A 3A-10.1
#On what frequencies within the 160 meter band may emission A3E be transmitted?
1800-2000 kHz only
1800-1900 kHz only
1900-2000 kHz only
1825-1950 kHz only
;29. C 3A-10.2
#On what frequencies within the 80 meter band may emission A1A be transmitted?
3500-4000 kHz only
3500-3750 kHz only
3700-3750 kHz only
3890-4000 kHz only
;30. D 3A-10.3
#On what frequencies within the 40 meter band may emission A3F be transmitted?
7150-7300 kHz only
7225-7300 kHz only
7000-7300 kHz only
7100-7150 kHz only
;31. C 3A-10.4
#On what frequencies within the 30 meter band may emission F1B be transmitted?
10.100-10.150 MHz only
10.140-10.150 MHz only
10.125-10.150 MHz only
10.100-10.125 MHz only
;32. B 3A-10.5
#On what frequencies within the 20 meter band may emission A3C be transmitted?
14,150-14,350 kHz only
14,200-14,300 kHz only
14,025-14,150 kHz only
14,150-14,300 kHz only
;33. C 3A-10.6
#On what frequencies within the 15 meter band may emission F3C be transmitted?
21,200-21,450 kHz only
21,200-21,300 kHz only
21,350-21,450 kHz only
21,100-21,200 kHz only
;34. C 3A-10.7
#On what frequencies within the 12 meter band may emission J3E be transmitted?
24,930-24,990 kHz only
24,890-24,990 kHz only
24,890-24,930 kHz only
J3E is not permitted in this band
;35. C 3A-10.8
#On what frequencies within the 10 meter band may emission A3E be transmitted?
28,300-29,700 kHz only
28,000-28,300 kHz only
29,000-29,700 kHz only
28,000-29,000 kHz only
;36. C 3A-13.1
#How is the sending speed (signaling rate) for digital communications determined?
By taking the reciprocal of the shortest (signaling) time interval (in seconds) that occurs during a transmission, where each time interval is the period between changes of transmitter state (including changes in emission amplitude, frequency, phase, or combination of these, as authorized)
By taking the reciprocal of the shortest (signaling) time interval (in minutes) that occurs during a transmission, where each time interval is the period between changes of transmitter state (including changes in emission amplitude, frequency, phase, or combination of these, as authorized)
By taking the square root of the shortest (signaling) time interval (in seconds) that occurs during a transmission, where each time interval is the period between changes of transmitter state (including changes in emission amplitude, frequency, phase, or combination of these, as authorized)
By taking the square root of the shortest (signaling) time interval (in minutes) that occurs during a transmission, where each time interval is the period between changes of transmitter state (including changes in emission amplitude, frequency, phase, or combination of these, as authorized)
;37. D 3A-13.2
#What is the maximum sending speed permitted for an emission F1B transmission below 28-MHz?
300 bauds
56 kilobauds
19.6 kilobauds
1200 bauds
;38. B 3A-14.3
#Under what circumstances, if any, may an amateur station engage in some form of broadcasting?
Under no circumstances
During severe storms, amateurs may broadcast weather information for people with scanners
If power levels under one watt are used, amateur stations may broadcast information bulletins, but not music
Amateur broadcasting is permissible above 10 GHz
;39. A 3A-14.6
#What protection, if any, is afforded an amateur station transmission against retransmission by a broadcast station?
No protection whatsoever
The broadcaster must secure permission for retransmission from the control operator of the amateur station
The broadcaster must petition the FCC for retransmission rights 30 days in advance
Retransmissions may only be made during a declared emergency
;40. D 3A-15.1
#Under what circumstances, if any, may the playing of a violin be transmitted by an amateur station?
Transmitting music is not permitted in the Amateur Service
When the music played produces no dissonances or spurious emissions
When it is used to jam an illegal transmission
Only above 1215 MHz
;41. C 3A-15.3
#Under what circumstances, if any, may the playing of a piano be transmitted by an amateur station?
Transmitting music is not permitted in the Amateur Service
When it is used to jam an illegal transmission
Only above 1215 MHz
When the music played produces no dissonances or spurious emissions
;42. B 3A-15.4
#Under what circumstances, if any, may the playing of a harmonica be transmitted by an amateur station?
Transmitting music is not permitted in the Amateur Service
When the music played produces no dissonances or spurious emissions
When it is used to jam an illegal transmission
Only above 1215 MHz
;43. C 3A-16.1
#Under what circumstances, if any, may an amateur station transmit a message in a secret code in order to obscure the meaning?
Never
Only above 450 MHz
Only on Field Day
Only during a declared communications emergency
;44. B 3A-16.2
#What types of abbreviations or signals are not considered codes or ciphers?
Abbreviations and signals established by regulation or custom and usage and whose intent is to facilitate communication and not to obscure meaning
Abbreviations and signals certified by the ARRL
No abbreviations are permitted, as they tend to obscure the meaning of the message to FCC monitoring stations
Only "10-codes" are permitted
;45. A 3A-16.3
#When, if ever, are codes and ciphers permitted in domestic amateur radiocommunications?
Codes and ciphers are prohibited under all circumstances
Codes and ciphers are permitted during ARRL-sponsored contests
Codes and ciphers are permitted during nationally declared emergencies
Codes and ciphers are permitted above 2.3 GHz
;46. A 3A-16.4
#When, if ever, are codes and ciphers permitted in international amateur radiocommunications?
Codes and ciphers are prohibited under all circumstances
Codes and ciphers are permitted during ITU-sponsored DX contests
Codes and ciphers are permitted during internationally declared emergencies
Codes and ciphers are permitted only on frequencies above 2.3 GHz
#What is meant by the term flattopping in an emission J3E transmission?
Signal distortion caused by excessive drive
Signal distortion caused by insufficient collector current
The transmitter's automatic level control is properly adjusted
The transmitter's carrier is properly suppressed
;48. B 3B-1.5
#How should the microphone gain control be adjusted on an emission J3E transmitter?
For slight movement of the ALC meter on modulation peaks
For full deflection of the ALC meter on modulation peaks
For 100% frequency deviation on modulation peaks
For a dip in plate current
;49. B 3B-2.1
#In which segment of the 20 meter band do most emission F1B transmissions take place?
Between 14.075 and 14.100 MHz
Between 14.000 and 14.050 MHz
Between 14.150 and 14.225 MHz
Between 14.275 and 14.350 MHz
;50. A 3B-2.2
#In which segment of the 80 meter band do most emission F1B transmissions take place?
3.610 to 3.630 MHz
3500 to 3525 kHz
3700 to 3750 kHz
3.775 to 3.825 MHz
;51. C 3B-2.3
#What is meant by the term Baudot?
Baudot is a 5-bit code, with additional start and stop bits
Baudot is a 7-bit code, with start, stop and parity bits
Baudot is a 7-bit code in which each character has four mark and three space bits
Baudot is a 6-bit code, with additional start, stop and parity bits
;52. A 3B-2.4
#What is meant by the term ASCII?
ASCII is a 7-bit code, with additional start, stop and parity bits
ASCII is a 7-bit code in which each character has four mark and three space bits
ASCII is a 5-bit code, with additional start and stop bits
ASCII is a 5-bit code in which each character has three mark and two space bits
;53. B 3B-2.6
#What is the most common frequency shift for emission F1B transmissions in the amateur HF bands?
170 Hz
85 Hz
425 Hz
850 Hz
;54. C 3B-2.10
#What are the two subset modes of AMTOR?
ARQ and FEC
A mark of 2125 Hz and a space of 2295 Hz
Baudot and ASCII
USB and LSB
;55. D 3B-2.11
#What is the meaning of the term ARQ?
Automatic Repeat Request
Automatic Repeater Queue
Automatic Receiver Quieting
Automatically Resend Quickly
;56. B 3B-2.12
#What is the meaning of the term FEC?
Forward Error Correction
Frame Error Check
Frequency Envelope Control
Frequency Encoded Connection
;57. A 3B-3.8
#What is a band plan?
An outline adopted by Amateur Radio operators for operating within a specific portion of radio spectrum
An arrangement for deviating from FCC Rules and Regulations
A schedule for operating devised by the Federal Communications Commission
A plan devised for a club on how best to use a band during a contest
;58. A 3B-3.12
#What is the usual input/output frequency separation for a 10 meter station in repeater operation?
100 kHz
600 kHz
1.6 MHz
170 Hz
;59. A 3B-4.1
#What is meant by the term VOX transmitter control?
Circuitry that causes the transmitter to transmit automatically when the operator speaks into the microphone
Circuitry that shifts the frequency of the transmitter when the operator switches from radiotelegraphy to radiotelephony
Circuitry that activates the receiver incremental tuning in a transceiver
Circuitry that isolates the microphone from the ambient noise level
;60. B 3B-4.2
#What is the common name for the circuit that causes a transmitter to automatically transmit when a person speaks into the microphone?
VOX
VXO
VCO
VFO
;61. D 3B-5.1
#What is meant by the term full break-in telegraphy?
A system of radiotelegraph communication in which the receiver is sensitive to incoming signals between transmitted key pulses
A system of radiotelegraph communication in which the breaking station sends the Morse Code symbol BK
A system of radiotelegraph communication in which only automatic keyers can be used
A system of radiotelegraph communication in which the operator must activate the send-receive switch after completing a transmission
;62. C 3B-5.2
#What Q signal is used to indicate full break-in telegraphy capability?
QSK
QSB
QSF
QSV
;63. B 3B-6.1
#When selecting an emission A1A transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference?
150 to 500 Hz
5 to 50 Hz
Approximately 3 kHz
Approximately 6 kHz
;64. B 3B-6.2
#When selecting an emission J3E transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference?
Approximately 3 kHz between suppressed carriers
150 to 500 Hz between suppressed carriers
Approximately 6 kHz between suppressed carriers
Approximately 10 kHz between suppressed carriers
;65. B 3B-6.3
#When selecting an emission F1B RTTY transmitting frequency, what is the minimum frequency separation from a QSO in progress that should be allowed in order to minimize interference?
Approximately 250 to 500 Hz center to center
Approximately 45 Hz center to center
Approximately 3 kHz center to center
Approximately 6 kHz center to center
;66. B 3B-7.1
#What is an azimuthal map?
A map projection, centered on a particular location, that determines the shortest path between two points on the surface of the earth
A map projection that is always centered on the North Pole
A map that shows the angle at which an amateur satellite crosses the equator
A map that shows the number of degrees longitude that an amateur satellite appears to move westward at the equator with each orbit
;67. A 3B-7.2
#How can an azimuthal map be helpful in conducting international HF radiocommunications?
It is used to determine the proper beam heading for the shortest path to a DX station
It is used to determine the most efficient transmitting antenna height to conduct the desired communication
It is used to determine the angle at which an amateur satellite crosses the equator
It is used to determine the maximum usable frequency (MUF)
;68. A 3B-7.3
#What is the most useful type of map when orienting a directional antenna toward a station 5,000 miles distant?
Azimuthal
Mercator
Polar projection
Topographical
;69. C 3B-7.4
#A directional antenna pointed in the long-path direction to another station is generally oriented how many degrees from the short-path heading?
180 degrees
45 degrees
90 degrees
270 degrees
;70. C 3B-7.5
#What is the short-path heading to Antarctica?
Approximately 180 degrees
Approximately 0 degrees
Approximately 90 degrees
Approximately 270 degrees
;71. C 3B-8.1
#When permitted, transmissions to amateur stations in another country must be limited to only what type of messages?
Messages of a technical nature or remarks of a personal character of relative unimportance
Messages of any type are permitted
Messages that compete with public telecommunications services
Such transmissions are never permitted
;72. B 3B-8.2
#In which International Telecommunication Union Region is the continental United States?
Region 2
Region 1
Region 3
Region 4
;73. B 3B-8.3
#In which International Telecommunication Union Region is Alaska?
Region 2
Region 1
Region 3
Region 4
;74. C 3B-8.4
#In which International Telecommunication Union Region is American Samoa?
Region 3
Region 1
Region 2
Region 4
;75. C 3B-8.5
#For uniformity in international radiocommunication, what time measurement standard should amateur radio operators worldwide use?
Coordinated Universal Time
Eastern Standard Time
Uniform Calibrated Time
Universal Time Control
;76. C 3B-8.6
#In which International Telecommunication Union Region is Hawaii?
Region 3
Region 1
Region 2
Region 4
;77. C 3B-8.7
#In which International Telecommunication Union Region are the Northern Mariana Islands?
Region 3
Region 1
Region 2
Region 4
;78. C 3B-8.8
#In which International Telecommunication Union Region is Guam?
Region 3
Region 1
Region 2
Region 4
;79. C 3B-8.9
#In which International Telecommunication Union Region is Wake Island?
Region 3
Region 1
Region 2
Region 4
;80. A 3B-10.1
#What is the Amateur Auxiliary to the FCC's Field Operations Bureau?
Amateur Volunteers formally enlisted to monitor the airwaves for rules violations
Amateur Volunteers who conduct Amateur Radio licensing examinations
Amateur Volunteers who conduct frequency coordination for amateur VHF repeaters
Amateur Volunteers who determine height above average terrain measurements for repeater installations
;81. B 3B-10.2
#What are the objectives of the Amateur Auxiliary to the FCC's Field Operations Bureau?
To foster amateur self-regulation and compliance with the rules
To enforce amateur self-regulation and compliance with the rules
To promote efficient and orderly spectrum usage in the repeater subbands
To provide emergency and public safety communications
#What is the maximum distance along the earth's surface that can normally be covered in one hop using the F2 layer?
Approximately 2500 miles
Approximately 180 miles
Approximately 1200 miles
No distance; this layer does not support radio communication
;83. B 3C-1.7
#What is the maximum distance along the earth's surface that can be covered in one hop using the E layer?
Approximately 1200 miles
Approximately 180 miles
Approximately 2500 miles
No distance; this layer does not support radio communication
;84. B 3C-1.9
#What is the average height of maximum ionization of the E layer?
70 miles
45 miles
200 miles
1200 miles
;85. A 3C-1.10
#During what part of the day, and in what season of the year can the F2 layer be expected to reach its maximum height?
At noon during the summer
At midnight during the summer
At dusk in the spring and fall
At noon during the winter
;86. D 3C-1.13
#What is the critical angle, as used in radio wave propagation?
The highest take off angle that will return a radio wave to earth during specific ionospheric conditions
The lowest take off angle that will return a radio wave to earth under specific ionospheric conditions
The compass direction of the desired DX station from your location
The 180-degree-inverted compass direction of the desired DX station from your location
;87. C 3C-2.3
#What is the main reason that the 160, 80, and 40 meter amateur bands tend to be useful for only short-distance communications during daylight hours?
Because of D-layer absorption
Because of a lack of activity
Because of auroral propagation
Because of magnetic flux
;88. C 3C-2.4
#What is the principal reason the 160 meter through 40 meter bands are useful for only short-distance radiocommunications during daylight hours?
D-layer absorption
F-layer bending
Gamma radiation
Tropospheric ducting
;89. B 3C-3.3
#If the maximum usable frequency on the path from Minnesota to Africa is 22-MHz, which band should offer the best chance for a successful QSO?
15 meters
10 meters
20 meters
40 meters
;90. C 3C-3.4
#If the maximum usable frequency on the path from Ohio to West Germany is 17-MHz, which band should offer the best chance for a successful QSO?
20 meters
80 meters
40 meters
2 meters
;91. B 3C-5.1
#Over what periods of time do sudden ionospheric disturbances normally last?
A few minutes to a few hours
The entire day
A few hours to a few days
Approximately one week
;92. A 3C-5.2
#What can be done at an amateur station to continue radiocommunications during a sudden ionospheric disturbance?
Try a higher frequency
Try the other sideband
Try a different antenna polarization
Try a different frequency shift
;93. B 3C-5.3
#What effect does a sudden ionospheric disturbance have on the daylight ionospheric propagation of HF radio waves?
Disrupts transmissions on lower frequencies more than those on higher frequencies
Disrupts higher-latitude paths more than lower-latitude paths
Disrupts communications via satellite more than direct communications
None. Only dark (as in nighttime) areas of the globe are affected
;94. C 3C-5.4
#How long does it take a solar disturbance that increases the sun's ultraviolet radiation to cause ionospheric disturbances on earth?
8 minutes
Instantaneously
1.5 seconds
20 to 40 hours
;95. A 3C-5.5
#Sudden ionospheric disturbances cause increased radio wave absorption in which layer of the ionosphere?
D layer
E layer
F1 layer
F2 layer
;96. B 3C-6.2
#What is a characteristic of backscatter signals?
A wavering sound
High intelligibility
Reversed modulation
Reversed sidebands
;97. D 3C-6.4
#What makes backscatter signals often sound distorted?
The small part of the signal's energy scattered back to the transmitter skip zone through several radio-wave paths
Auroral activity and changes in the earth's magnetic field
The propagation through ground waves that absorb much of the signal's clarity
The earth's E-layer at the point of radio wave refraction
;98. B 3C-6.5
#What is the radio wave propagation phenomenon that allows a signal to be detected at a distance too far for ground wave propagation but too near for normal sky wave propagation?
Scatter
Ground wave
Sporadic-E skip
Short path skip
;99. A 3C-6.6
#When does ionospheric scatter propagation on the HF bands most often occur?
When the sunspot cycle is at a minimum
At night
When the F1 and F2 layers are combined
At frequencies above the maximum usable frequency
;100. B 3C-7.1
#What is solar flux?
The radio energy emitted by the sun
The density of the sun's magnetic field
The number of sunspots on the side of the sun facing the earth
A measure of the tilt of the earth's ionosphere on the side toward the sun
;101. D 3C-7.2
#What is the solar-flux index?
A measure of solar activity that is taken daily
A measure of past measurements of solar activity
A measurement of solar activity that compares daily readings with results from the last six months
Another name for the American sunspot number
;102. A 3C-7.3
#What is a timely indicator of solar activity?
The 2800-MHz solar flux index
The mean Canadian sunspot number
A clock set to Coordinated Universal Time
Van Allen radiation measurements taken at Boulder, Colorado
;103. D 3C-7.4
#What type of propagation conditions on the 15 meter band are indicated by a solar-flux index value of 60 to 70?
Poor ionospheric propagation
Unpredictable ionospheric propagation
No ionospheric propagation is possible
Excellent ionospheric propagation
;104. D 3C-7.5
#A solar flux index in the range of 90 to 110 indicates what type of propagation conditions on the 15 meter band?
Good ionospheric propagation
Poor ionospheric propagation
No ionospheric propagation is possible
Unpredictable ionospheric propagation
;105. A 3C-7.6
#A solar flux index of greater than 120 would indicate what type of propagation conditions on the 10 meter band?
Good ionospheric propagation
Poor ionospheric propagation
No ionospheric propagation is possible
Unpredictable ionospheric propagation
;106. D 3C-7.7
#For widespread long distance openings on the 6 meter band, what solar-flux index values would be required?
Greater than 250
Less than 50
Approximately 75
Greater than 100
;107. C 3C-7.8
#If the MUF is high and HF radiocommunications are generally good for several days, a similar condition can usually be expected how many days later?
28 days
7 days
14 days
90 days
;108. D 3C-10.1
#What is a geomagnetic disturbance?
A dramatic change in the earth's magnetic field over a short period of time
A sudden drop in the solar-flux index
A shifting of the earth's magnetic pole
Ripples in the ionosphere
;109. A 3C-10.2
#Which latitude paths are more susceptible to geomagnetic disturbances?
Those greater than 45 degrees latitude
Those less than 45 degrees latitude
Equatorial paths
All paths are affected equally
;110. B 3C-10.3
#What can be the effect of a major geomagnetic storm on radiocommunications?
Degraded high-latitude HF communications
Improved high-latitude HF communications
Improved ground-wave propagation
Improved chances of ducting at UHF
;111. D 3C-10.4
#How long does it take a solar disturbance that increases the sun's radiation of charged particles to affect radio wave propagation on earth?
20 to 40 hours
The effect is instantaneous
1.5 seconds
8 minutes
! 4 ;SUBELEMENT 3BD -- Amateur Radio Practice (5 questions)
;112. A 3D-1.5
#Which wires in a four conductor line cord should be attached to fuses in a 234-VAC primary (single phase) power supply?
Only the "hot" (black and red) wires
Only the "neutral" (white) wire
Only the ground (bare) wire
All wires
;113. A 3D-1.6
#What size wire is normally used on a 15-ampere, 117-VAC household lighting circuit?
AWG number 14
AWG number 16
AWG number 18
AWG number 22
;114. D 3D-1.7
#What size wire is normally used on a 20-ampere, 117-VAC household appliance circuit?
AWG number 12
AWG number 20
AWG number 16
AWG number 14
;115. C 3D-1.8
#What could be a cause of the room lights dimming when the transmitter is keyed?
A drop in AC line voltage
RF in the AC pole transformer
High resistance in the key contacts
The line cord is wired incorrectly
;116. D 3D-1.9
#What size fuse should be used on a #12 wire household appliance circuit?
Maximum of 20 amperes
Maximum of 100 amperes
Maximum of 60 amperes
Maximum of 30 amperes
;117. B 3D-2.4
#What safety feature is provided by a bleeder resistor in a power supply?
It discharges the filter capacitors
It improves voltage regulation
It removes shock hazards from the induction coils
It eliminates ground-loop current
;118. C 3D-3.1
#What kind of input signal is used to test the amplitude linearity of an emission J3E transmitter while viewing the output on an oscilloscope?
Two audio-frequency sine waves
Normal speech
An audio-frequency sine wave
An audio-frequency square wave
;119. C 3D-3.2
#To test the amplitude linearity of an emission J3E transmitter with an oscilloscope, what should the audio input to the transmitter be?
Two audio-frequency sine waves
Normal speech
An audio-frequency sine wave
An audio-frequency square wave
;120. C 3D-3.3
#How are two-tones used to test the amplitude linearity of an emission J3E transmitter?
Two non-harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on an oscilloscope
Two harmonically related audio tones are fed into the microphone input of a J3E transmitter, and the output is observed on an oscilloscope
Two harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on a distortion analyzer
Two non-harmonically related audio tones are fed into the microphone input of the transmitter, and the output is observed on a wattmeter
;121. D 3D-3.4
#What audio frequencies are used in a two-tone test of the linearity of an emission J3E transmitter?
Any two audio tones may be used, but they must be within the transmitter audio passband, and should not be harmonically related
20 Hz and 20,000 Hz tones must be used
1200 Hz and 2400 Hz tones must be used
Any two audio tones may be used, if they are harmonically related
;122. D 3D-3.5
#What can be determined by making a two-tone test using an oscilloscope?
The amplifier linearity
The percent of frequency modulation
The percent of carrier phase shift
The frequency deviation
;123. A 3D-4.1
#How can the grid-current meter in a power amplifier be used as a neutralizing indicator?
Tune for minimum change in grid current as the output circuit is changed
Tune for maximum change in grid current as the output circuit is changed
Tune for minimum grid current
Tune for maximum grid current
;124. D 3D-4.2
#Why is neutralization in some vacuum tube amplifiers necessary?
To cancel oscillation caused by the effects of interelectrode capacitance
To reduce the limits of loaded Q in practical tuned circuits
To reduce grid to cathode leakage
To cancel acid build-up caused by thorium oxide gas
;125. C 3D-4.3
#How is neutralization of an RF amplifier accomplished?
By supplying energy from the amplifier output to the input shifted 180 degrees out of phase
By supplying energy from the amplifier output to the input on alternate half cycles
By supplying energy from the amplifier output to the input shifted 360 degrees out of phase
By supplying energy from the amplifier output to the input with a proper DC bias
;126. B 3D-4.4
#What purpose does a neutralizing circuit serve in an RF amplifier?
It cancels the effects of positive feedback
It controls differential gain
It eliminates circulating currents
It reduces incidental grid modulation
;127. B 3D-4.5
#What is the reason for neutralizing the final amplifier stage of a transmitter?
To eliminate parasitic oscillations
To limit the modulation index
To cut off the final amplifier during standby periods
To keep the carrier on frequency
;128. B 3D-5.1
#How can the output PEP of a transmitter be determined with an oscilloscope?
Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(0.707 PEV)(0.707 PEV)]/RL
Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(Vp)(Vp)]/(RL)
Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = (Vp)(Vp)(RL)
Measure peak load voltage across a resistive load with an oscilloscope, and calculate, using PEP = [(1.414 PEV)(1.414 PEV)]/RL
;129. A 3D-5.5
#What is the output PEP from a transmitter when an oscilloscope shows 200-volts peak-to-peak across a 50 ohm resistor connected to the transmitter output terminals?
100 watts
200 watts
400 watts
1000 watts
;130. B 3D-5.6
#What is the output PEP from a transmitter when an oscilloscope shows 500-volts peak-to-peak across a 50 ohm resistor connected to the transmitter output terminals?
625 watts
500 watts
1250 watts
2500 watts
;131. B 3D-5.7
#What is the output PEP from an N0N transmitter when an average-reading wattmeter connected to the transmitter output terminals indicates 1060 watts?
1060 watts
530 watts
1500 watts
2120 watts
;132. D 3D-6.1
#What item of test equipment contains horizontal and vertical channel amplifiers?
The oscilloscope
The ohmmeter
The signal generator
The ammeter
;133. A 3D-6.2
#What types of signals can an oscilloscope measure?
Any time-dependent signal within the bandwidth capability of the instrument
Blinker-light signals from ocean-going vessels
International nautical flag signals
Signals created by aeronautical flares
;134. D 3D-6.3
#What is an oscilloscope?
An instrument that displays signal waveforms
An instrument that displays the radiation resistance of an antenna
An instrument that displays the SWR on a feed line
An instrument that displays the resistance in a circuit
;135. B 3D-6.4
#What can cause phosphor damage to an oscilloscope cathode ray tube?
Too high an intensity setting
Directly connecting deflection electrodes to the cathode ray tube
Overdriving the vertical amplifier
Improperly adjusted focus
;136. C 3D-9.1
#What is a signal tracer?
A device for detecting signals in a circuit
A direction-finding antenna
An aid for following schematic diagrams
A device for drawing signal waveforms
;137. A 3D-9.2
#How is a signal tracer used?
To detect the presence of a signal in the various stages of a receiver
To locate a source of interference
To trace the path of a radio signal through the ionosphere
To draw a waveform on paper
;138. D 3D-9.3
#What is a signal tracer normally used for?
To identify an inoperative stage in a radio receiver
To identify the source of radio transmissions
To make exact replicas of signals
To give a visual indication of standing waves on open-wire feed lines
;139. B 3D-10.1
#What is the most effective way to reduce or eliminate audio frequency interference to home entertainment systems?
Install bypass capacitors
Install bypass inductors
Install metal oxide varistors
Install bypass resistors
;140. B 3D-10.2
#What should be done when a properly-operating amateur station is the source of interference to a nearby telephone?
Contact a phone service representative about installing RFI filters
Make internal adjustments to the telephone equipment
Nothing can be done to cure the interference
Ground and shield the local telephone distribution amplifier
;141. C 3D-10.3
#What sound is heard from a public address system when audio rectification occurs in response to a nearby emission J3E transmission?
Distorted speech from the transmitter's signals
A steady hum that persists while the transmitter's carrier is on the air
On-and-off humming or clicking
Clearly audible speech from the transmitter's signals
;142. C 3D-10.4
#How can the possibility of audio rectification occurring be minimized?
By ensuring all station equipment is properly grounded
By using a solid state transmitter
By using CW emission only
By using AM emission only
;143. A 3D-10.5
#What sound is heard from a public address system when audio rectification occurs in response to a nearby emission A3E transmission?
Audible, possibly distorted speech from the transmitter signals
On-and-off humming or clicking
Muffled, distorted speech from the transmitter's signals
Extremely loud, severely distorted speech from the transmitter's signals
;144. D 3D-12.2
#What is the reason for using a speech processor with an emission J3E transmitter?
A properly adjusted speech processor improves signal intelligibility at the receiver
A properly adjusted speech processor reduces average transmitter power requirements
A properly adjusted speech processor reduces unwanted noise pickup from the microphone
A properly adjusted speech processor improves voice frequency fidelity
;145. B 3D-12.3
#When a transmitter is 100% modulated, will a speech processor increase the output PEP?
No
Yes
It will decrease the transmitter's peak power output
It will decrease the transmitter's average power output
;146. C 3D-12.4
#Under which band conditions should a speech processor not be used?
When the frequency in use is clear
When there is high atmospheric noise on the band
When the band is crowded
When the sunspot count is relatively high
;147. D 3D-12.5
#What effect can result from using a speech processor with an emission J3E transmitter?
A properly adjusted speech processor improves signal intelligibility at the receiver
A properly adjusted speech processor reduces average transmitter power requirements
A properly adjusted speech processor reduces unwanted noise pickup from the microphone
A properly adjusted speech processor improves voice frequency fidelity
;148. A 3D-13.1
#At what point in a coaxial line should an electronic T-R switch be installed?
Between the transmitter and low-pass filter
Between the low-pass filter and antenna
At the antenna feed point
Right after the low-pass filter
;149. C 3D-13.2
#Why is an electronic T-R switch preferable to a mechanical one?
Higher operating speed
Greater receiver sensitivity
Circuit simplicity
Cleaner output signals
;150. D 3D-13.3
#What station accessory facilitates QSK operation?
Electronic TR switch
Oscilloscope
Audio CW filter
Antenna relay
;151. B 3D-14.6
#What is an antenna noise bridge?
An instrument for measuring the impedance of an antenna or other electrical circuit
An instrument for measuring the noise figure of an antenna or other electrical circuit
An instrument for measuring solar flux
An instrument for tuning out noise in a receiver
;152. C 3D-14.7
#How is an antenna noise bridge used?
It is connected between a receiver and an unknown impedance and tuned for minimum noise
It is connected at the antenna feed point, and the noise is read directly
It is connected between a transmitter and an antenna and tuned for minimum SWR
It is connected between an antenna and a Transmatch and adjusted for minimum SWR
;153. B 3D-15.1
#How does the emitted waveform from a properly-adjusted emission J3E transmitter appear on a monitoring oscilloscope?
A waveform that mirrors the input waveform
A vertical line
A square wave
Two loops at right angles
;154. A 3D-15.2
#What is the best instrument for checking transmitted signal quality from an emissions A1A/J3E transmitter?
A monitor oscilloscope
A field strength meter
A sidetone monitor
A diode probe and an audio amplifier
;155. B 3D-15.3
#What is a monitoring oscilloscope?
A device used to observe the waveform of a transmitted signal
A device used by the FCC to detect out-of-band signals
A device used to display SSTV signals
A device used to display signals in a receiver IF stage
;156. D 3D-15.4
#How is a monitoring oscilloscope connected in a station in order to check the quality of the transmitted signal?
Connect the transmitter output to the vertical-deflection plates of the oscilloscope
Connect the receiver IF output to the vertical-deflection plates of the oscilloscope
Connect the transmitter audio input to the oscilloscope vertical input
Connect a receiving antenna directly to the oscilloscope vertical input
;157. A 3D-17.2
#What is the most appropriate instrument to use when determining antenna horizontal radiation patterns?
A field strength meter
A grid-dip meter
A wave meter
A vacuum-tube voltmeter
;158. C 3D-17.3
#What is a field-strength meter?
A device for monitoring relative RF output
A device for determining the standing-wave ratio on a transmission line
A device for checking modulation on the output of a transmitter
A device for increasing the average transmitter output
;159. A 3D-17.4
#What is a simple instrument that can be useful for monitoring relative RF output during antenna and transmitter adjustments?
A field-strength meter
An antenna noise bridge
A multimeter
A Transmatch
;160. B 3D-17.5
#When the power output from a transmitter is increased by four times, how should the S-meter reading on a nearby receiver change?
Increase by approximately one S-unit
Decrease by approximately one S-unit
Increase by approximately four S-units
Decrease by approximately four S-units
;161. C 3D-17.6
#By how many times must the power output from a transmitter be increased to raise the S-meter reading on a nearby receiver from S-8 to S-9?
The opposition to the flow of AC in a circuit containing only capacitance
The force of repulsion presented to an electric field by another field with the same charge
;163. C 3E-1.2
#What is the opposition to the flow of AC in a circuit containing both resistance and reactance called?
Impedance
Ohm
Joule
Watt
;164. B 3E-3.1
#What is meant by the term reactance?
Opposition to AC caused by inductors and capacitors
Opposition to DC caused by resistors
A property of ideal resistors in AC circuits
A large spark produced at switch contacts when an inductor is de-energized
;165. D 3E-3.2
#What is the opposition to the flow of AC caused by an inductor called?
Reactance
Resistance
Reluctance
Admittance
;166. D 3E-3.3
#What is the opposition to the flow of AC caused by a capacitor called?
Reactance
Resistance
Reluctance
Admittance
;167. D 3E-3.4
#How does a coil react to AC?
As the frequency of the applied AC increases, the reactance also increases
As the frequency of the applied AC increases, the reactance decreases
As the amplitude of the applied AC increases, the reactance also increases
As the amplitude of the applied AC increases, the reactance decreases
;168. A 3E-3.5
#How does a capacitor react to AC?
As the frequency of the applied AC increases, the reactance decreases
As the frequency of the applied AC increases, the reactance increases
As the amplitude of the applied AC increases, the reactance also increases
As the amplitude of the applied AC increases, the reactance decreases
;169. A 3E-6.1
#When will a power source deliver maximum output?
When the impedance of the load is equal to the impedance of the source
When the SWR has reached a maximum value
When the power supply fuse rating equals the primary winding current
When air wound transformers are used instead of iron core transformers
;170. D 3E-6.2
#What is meant by impedance matching?
To make the load impedance equal the source impedance
To make the load impedance much greater than the source impedance
To make the load impedance much less than the source impedance
To use a balun at the antenna feed point
;171. D 3E-6.3
#What occurs when the impedance of an electrical load is equal to the internal impedance of the power source?
The source delivers maximum power to the load
The source delivers minimum power to the load
There will be a high SWR condition
No current can flow through the circuit
;172. A 3E-6.4
#Why is impedance matching important in radio work?
So the source can deliver maximum power to the load
So the load will draw minimum power from the source
To ensure that there is less resistance than reactance in the circuit
To ensure that the resistance and reactance in the circuit are equal
;173. B 3E-7.2
#What is the unit measurement of reactance?
Ohm
Mho
Ampere
Siemen
;174. A 3E-7.4
#What is the unit measurement of impedance?
Ohm
Volt
Ampere
Watt
;175. A 3E-10.1
#What is a bel?
The basic unit used to describe a change in power levels
The basic unit used to describe a change in inductances
The basic unit used to describe a change in capacitances
The basic unit used to describe a change in resistances
;176. A 3E-10.2
#What is a decibel?
A unit used to describe a change in power levels, equal to 0.1 bel
A unit used to describe a change in power levels, equal to 0.01 bel
A unit used to describe a change in power levels, equal to 10 bels
A unit used to describe a change in power levels, equal to 100 bels
;177. D 3E-10.3
#Under ideal conditions, a barely detectable change in loudness is approximately how many dB?
1 dB
12 dB
6 dB
3 dB
;178. B 3E-10.4
#A two-times increase in power results in a change of how many dB?
Multiplying the original power by 2 gives a new power that is 3 dB higher
Multiplying the original power by 2 gives a new power that is 1 dB higher
Multiplying the original power by 2 gives a new power that is 6 dB higher
Multiplying the original power by 2 gives a new power that is 12 dB higher
;179. D 3E-10.5
#An increase of 6 dB results from raising the power by how many times?
Multiply the original power by 4 to get the new power
Multiply the original power by 1.5 to get the new power
Multiply the original power by 2 to get the new power
Multiply the original power by 3 to get the new power
;180. B 3E-10.6
#A decrease of 3 dB results from lowering the power by how many times?
Divide the original power by 2 to get the new power
Divide the original power by 1.5 to get the new power
Divide the original power by 3 to get the new power
Divide the original power by 4 to get the new power
;181. C 3E-10.7
#A signal strength report is "10 dB over S9". If the transmitter power is reduced from 1500 watts to 150 watts, what should be the new signal strength report?
S9
S5
S7
S9 plus 5 dB
;182. D 3E-10.8
#A signal strength report is "20 dB over S9". If the transmitter power is reduced from 1500 watts to 150 watts, what should be the new signal strength report?
S9 plus 10 dB
S5
S7
S9
;183. C 3E-10.9
#A signal strength report is "20 dB over S9". If the transmitter power is reduced from 1500 watts to 15 watts, what should be the new signal strength report?
S9
S5
S7
S9 plus 10 dB
;184. D 3E-12.1
#If a 1.0-ampere current source is connected to two parallel-connected 10 ohm resistors, how much current passes through each resistor?
0.5 ampere
10 amperes
2 amperes
1 ampere
;185. B 3E-12.3
#In a parallel circuit with a voltage source and several branch resistors, what relationship does the total current have to the current in the branch circuits?
The total current equals the sum of the branch current through each resistor
The total current equals the average of the branch current through each resistor
The total current decreases as more parallel resistors are added to the circuit
The total current is calculated by adding the voltage drops across each resistor and multiplying the sum by the total number of all circuit resistors
;186. B 3E-13.1
#How many watts of electrical power are being used when a 400-VDC power source supplies an 800 ohm load?
200 watts
0.5 watt
400 watts
320,000 watts
;187. D 3E-13.2
#How many watts of electrical power are being consumed by a 12-VDC pilot light which draws 0.2-amperes?
2.4 watts
60 watts
24 watts
6 watts
;188. A 3E-13.3
#How many watts are being dissipated when 7.0-milliamperes flows through 1.25 kilohms?
Approximately 61 milliwatts
Approximately 39 milliwatts
Approximately 11 milliwatts
Approximately 9 milliwatts
;189. C 3E-14.1
#How is the total resistance calculated for several resistors in series?
The total resistance is found by adding the individual resistances together
The total resistance must be divided by the number of resistors to ensure accurate measurement of resistance
The total resistance is always the lowest-rated resistance
The tolerance of each resistor must be raised proportionally to the number of resistors
;190. D 3E-14.2
#What is the total resistance of two equal, parallel-connected resistors?
Half the resistance of either resistor
Twice the resistance of either resistance
The sum of the two resistances
The total resistance cannot be determined without knowing the exact resistances
;191. A 3E-14.3
#What is the total inductance of two equal, parallel-connected inductors?
Half the inductance of either inductor, assuming no mutual coupling
Twice the inductance of either inductor, assuming no mutual coupling
The sum of the two inductances, assuming no mutual coupling
The total inductance cannot be determined without knowing the exact inductances
;192. B 3E-14.4
#What is the total capacitance of two equal, parallel-connected capacitors?
Twice the capacitance of either capacitor
Half the capacitance of either capacitor
The value of either capacitor
The total capacitance cannot be determined without knowing the exact capacitances
;193. B 3E-14.5
#What is the total resistance of two equal, series-connected resistors?
Twice the resistance of either resistor
Half the resistance of either resistor
The value of either resistor
The total resistance cannot be determined without knowing the exact resistances
;194. B 3E-14.6
#What is the total inductance of two equal, series-connected inductors?
Twice the inductance of either inductor, assuming no mutual coupling
Half the inductance of either inductor, assuming no mutual coupling
The value of either inductor, assuming no mutual coupling
The total inductance cannot be determined without knowing the exact inductances
;195. A 3E-14.7
#What is the total capacitance of two equal, series-connected capacitors?
Half the capacitance of either capacitor
Twice the capacitance of either capacitor
The value of either capacitor
The total capacitance cannot be determined without knowing the exact capacitances
;196. C 3E-15.1
#What is the voltage across a 500 turn secondary winding in a transformer when the 2250 turn primary is connected to 117-VAC?
26 volts
2369 volts
526.5 volts
5.8 volts
;197. A 3E-15.2
#What is the turns ratio of a transformer to match an audio amplifier having an output impedance of 200 ohms to a speaker having an impedance of 10 ohms?
4.47 to 1
14.14 to 1
20 to 1
400 to 1
;198. A 3E-15.3
#What is the turns ratio of a transformer to match an audio amplifier having an output impedance of 600 ohms to a speaker having an impedance of 4 ohms?
12.2 to 1
24.4 to 1
150 to 1
300 to 1
;199. D 3E-15.4
#What is the impedance of a speaker which requires a transformer with a turns ratio of 24 to 1 to match an audio amplifier having an output impedance of 2000 ohms?
3.5 ohms
576 ohms
83.3 ohms
7.0 ohms
;200. B 3E-16.1
#What is the voltage that would produce the same amount of heat over time in a resistive element as would an applied sine wave AC voltage?
A DC voltage equal to the RMS value of the AC voltage
A DC voltage equal to the peak-to-peak value of the AC voltage
A DC voltage equal to the average value of the AC voltage
A DC voltage equal to the peak value of the AC voltage
;201. D 3E-16.2
#What is the peak-to-peak voltage of a sine wave which has an RMS voltage of 117-volts?
330.9 volts
82.7 volts
165.5 volts
183.9 volts
;202. B 3E-16.3
#A sine wave of 17-volts peak is equivalent to how many volts RMS?
#Why is a Yagi antenna often used for radiocommunications on the 20 meter band?
It discriminates against interference from other stations off to the side or behind
It provides excellent omnidirectional coverage in the horizontal plane
It is smaller, less expensive and easier to erect than a dipole or vertical antenna
It provides the highest possible angle of radiation for the HF bands
;247. D 3I-1.7
#What method is best suited to match an unbalanced coaxial feed line to a Yagi antenna?
Gamma match
T" match
Delta match
Hairpin match
;248. A 3I-1.9
#How can the bandwidth of a parasitic beam antenna be increased?
Use larger diameter elements
Use closer element spacing
Use traps on the elements
Use tapered-diameter elements
;249. C 3I-2.1
#How much gain over a half-wave dipole can a two-element cubical quad antenna provide?
Approximately 6 dB
Approximately 0.6 dB
Approximately 2 dB
Approximately 12 dB
;250. B 3I-3.1
#How long is each side of a cubical quad antenna driven element for 21.4-MHz?
11.7 feet
1.17 feet
47 feet
469 feet
;251. B 3I-3.2
#How long is each side of a cubical quad antenna driven element for 14.3-MHz?
17.6 feet
1.75 feet
23.4 feet
70.3 feet
;252. B 3I-3.3
#How long is each side of a cubical quad antenna reflector element for 29.6-MHz?
8.7 feet
8.23 feet
9.7 feet
34.8 feet
;253. C 3I-3.4
#How long is each leg of a symmetrical delta loop antenna driven element for 28.7-MHz?
11.7 feet
8.75 feet
11.32 feet
35 feet
;254. C 3I-3.5
#How long is each leg of a symmetrical delta loop antenna driven element for 24.9-MHz?
13.45 feet
10.09 feet
13.05 feet
40.36 feet
;255. C 3I-3.6
#How long is each leg of a symmetrical delta loop antenna reflector element for 14.1-MHz?
24.35 feet
18.26 feet
23.76 feet
73.05 feet
;256. B 3I-3.7
#How long is the driven element of a Yagi antenna for 14.0-MHz?
Approximately 33 feet
Approximately 17 feet
Approximately 35 feet
Approximately 66 feet
;257. B 3I-3.8
#How long is the director element of a Yagi antenna for 21.1-MHz?
Approximately 21 feet
Approximately 42 feet
Approximately 17 feet
Approximately 10.5 feet
;258. C 3I-3.9
#How long is the reflector element of a Yagi antenna for 28.1-MHz?
Approximately 17.5 feet
Approximately 8.75 feet
Approximately 16.6 feet
Approximately 35 feet
;259. D 3I-5.1
#What is the feed-point impedance for a half-wavelength dipole HF antenna suspended horizontally one-quarter wavelength or more above the ground?
Approximately 73 ohms, resistive
Approximately 50 ohms, resistive
Approximately 73 ohms, resistive and inductive
Approximately 50 ohms, resistive and capacitive
;260. B 3I-5.2
#What is the feed-point impedance of a quarter-wavelength vertical HF antenna with a horizontal ground plane?
Approximately 36 ohms
Approximately 18 ohms
Approximately 52 ohms
Approximately 72 ohms
;261. D 3I-5.3
#What is an advantage of downward sloping radials on a ground-plane antenna?
Sloping the radials downward brings the feed-point impedance closer to 50 ohms
Sloping the radials downward lowers the radiation angle
Sloping the radials downward brings the feed-point impedance close to 300 ohms
Sloping the radials downward allows rainwater to run off the antenna
;262. B 3I-5.4
#What happens to the feed-point impedance of a ground-plane antenna when the radials slope downward from the base of the antenna?
The feed-point impedance increases
The feed-point impedance decreases
The feed-point impedance stays the same
The feed-point impedance becomes purely capacitive
;263. C 3I-6.1
#Compared to a dipole antenna, what are the directional radiation characteristics of a cubical quad HF antenna?
The quad has more directivity in both horizontal and vertical planes
The quad has more directivity in the horizontal plane but less directivity in the vertical plane
The quad has less directivity in the horizontal plane but more directivity in the vertical plane
The quad has less directivity in both horizontal and vertical planes
;264. A 3I-6.2
#What is the radiation pattern of an ideal half-wavelength dipole HF antenna?
If it is installed parallel to the earth, it radiates well in a figure-eight pattern at right angles to the antenna wire
If it is installed parallel to the earth, it radiates well in a figure-eight pattern off both ends of the antenna wire
If it is installed parallel to the earth, it radiates equally well in all directions
If it is installed parallel to the earth, the pattern will have two lobes on one side of the antenna wire, and one larger lobe on the other side
;265. B 3I-6.3
#How does proximity to the ground affect the radiation pattern of a horizontal dipole HF antenna?
If the antenna is too far from the ground, the pattern becomes unpredictable
If the antenna is less than one-half wavelength from the ground, reflected radio waves from the ground distort the radiation pattern of the antenna
A dipole antenna's radiation pattern is unaffected by its distance to the ground
If the antenna is less than one-half wavelength from the ground, radiation off the ends of the wire is reduced
;266. C 3I-6.4
#What does the term antenna front-to-back ratio mean?
The power radiated in the major radiation lobe compared to the power radiated in exactly the opposite direction
The number of directors versus the number of reflectors
The relative position of the driven element with respect to the reflectors and directors
The power radiated in the major radiation lobe compared to the power radiated 90 degrees away from that direction
;267. D 3I-6.5
#What effect upon the radiation pattern of an HF dipole antenna will a slightly smaller parasitic parallel element located a few feet away in the same horizontal plane have?
If the spacing is greater than 0.1 wavelength, a major lobe will develop in the horizontal plane to the side of the driven element toward the parasitic element
The radiation pattern will not change appreciably
A major lobe will develop in the horizontal plane, parallel to the two elements
A major lobe will develop in the vertical plane, away from the ground
;268. C 3I-6.6
#What is the meaning of the term main lobe as used in reference to a directional antenna?
The direction of maximum radiated field strength from a radiating antenna
The direction of least radiation from an antenna
The point of maximum current in a radiating antenna element
The maximum voltage standing wave point on a radiating element
;269. A 3I-7.1
#Upon what does the characteristic impedance of a parallel-conductor antenna feed line depend?
The distance between the centers of the conductors and the radius of the conductors
The distance between the centers of the conductors and the length of the line
The radius of the conductors and the frequency of the signal
The frequency of the signal and the length of the line
;270. B 3I-7.2
#What is the characteristic impedance of various coaxial cables commonly used for antenna feed lines at amateur stations?
Around 50 and 75 ohms
Around 25 and 30 ohms
Around 80 and 100 ohms
Around 500 and 750 ohms
;271. A 3I-7.3
#What effect, if any, does the length of a coaxial cable have upon its characteristic impedance?
The length has no effect on the characteristic impedance
The length affects the characteristic impedance primarily above 144 MHz
The length affects the characteristic impedance primarily below 144 MHz
The length affects the characteristic impedance at any frequency
;272. D 3I-7.4
#What is the characteristic impedance of flat-ribbon TV-type twinlead?
300 ohms
50 ohms
75 ohms
100 ohms
;273. C 3I-8.4
#What is the cause of power being reflected back down an antenna feed line?
A difference between feed line impedance and antenna feed-point impedance
Operating an antenna at its resonant frequency
Using more transmitter power than the antenna can handle
Feeding the antenna with unbalanced feed line
;274. A 3I-9.3
#What will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 200 ohm feed-point impedance?
4:1
1:4
2:1
1:2
;275. D 3I-9.4
#What will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 10 ohm feed-point impedance?
5:1
2:1
50:1
1:5
;276. C 3I-9.5
#What will be the standing wave ratio when a 50 ohm feed line is connected to a resonant antenna having a 50 ohm feed-point impedance?
1:1
2:1
50:50
0:0
;277. C 3I-11.1
#How does the characteristic impedance of a coaxial cable affect the amount of attenuation to the RF signal passing through it?
The attenuation related to the characteristic impedance is about the same at all amateur frequencies below 1.5 GHz
The attenuation is affected more by the characteristic impedance at frequencies above 144 MHz than at frequencies below 144 MHz
The attenuation is affected less by the characteristic impedance at frequencies above 144 MHz than at frequencies below 144 MHz
The difference in attenuation depends on the emission type in use
;278. A 3I-11.2
#How does the amount of attenuation to a 2 meter signal passing through a coaxial cable differ from that to a 160 meter signal?
The attenuation is greater at 2 meters
The attenuation is less at 2 meters
The attenuation is the same at both frequencies
The difference in attenuation depends on the emission type in use
;279. D 3I-11.4
#What is the effect on its attenuation when flat-ribbon TV-type twinlead is wet?
Attenuation increases
Attenuation decreases slightly
Attenuation remains the same
Attenuation decreases sharply
;280. B 3I-11.7
#Why might silicone grease or automotive car wax be applied to flat-ribbon TV-type twinlead?
To reduce the buildup of dirt and moisture on the feed line
To reduce "skin effect" losses on the conductors
To increase the velocity factor of the feed line
To help dissipate heat during high-SWR operation
;281. D 3I-11.8
#In what values are RF feed line losses usually expressed?
dB/100 ft
Bels/1000 ft
dB/1000 ft
Bels/100 ft
;282. D 3I-11.10
#As the operating frequency increases, what happens to the dielectric losses in a feed line?
The losses increase
The losses decrease
The losses decrease to zero
The losses remain the same
;283. A 3I-11.12
#As the operating frequency decreases, what happens to the dielectric losses in a feed line?
The losses decrease
The losses increase
The losses remain the same
The losses become infinite
;284. D 3I-12.1
#What condition must be satisfied to prevent standing waves of voltage and current on an antenna feed line?
The antenna feed-point impedance must be matched to the characteristic impedance of the feed line
The antenna feed point must be at DC ground potential
The feed line must be an odd number of electrical quarter wavelengths long
The feed line must be an even number of physical half wavelengths long
;285. A 3I-12.2
#How is an inductively-coupled matching network used in an antenna system consisting of a center-fed resonant dipole and coaxial feed line?
An inductively coupled matching network is not normally used in a resonant antenna system
An inductively coupled matching network is used to increase the SWR to an acceptable level
An inductively coupled matching network can be used to match the unbalanced condition at the transmitter output to the balanced condition required by the coaxial line
An inductively coupled matching network can be used at the antenna feed point to tune out the radiation resistance
;286. D 3I-12.5
#What is an antenna-transmission line mismatch?
A condition where the characteristic impedance of the feed line does not equal the feed-point impedance of the antenna
A condition where the feed-point impedance of the antenna does not equal the output impedance of the transmitter
A condition where the output impedance of the transmitter does not equal the characteristic impedance of the feed line
A condition where a half-wavelength antenna is being fed with a transmission line of some length other than one-quarter wavelength at the operating frequency
