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Continued from file GEN-1.ASC...
3E-1.1 What is meant by the term ++++impedance++++?
A. The electric charge stored by a capacitor
B. The opposition to the flow of AC in a circuit containing
only capacitance
C. The opposition to the flow of AC in a circuit
D. The force of repulsion presented to an electric field by
another field with the same charge
3E-1.2 What is the opposition to the flow of AC in a circuit
containing both resistance and reactance called?
A. Ohm
B. Joule
C. Impedance
D. Watt
3E-3.1 What is meant by the term ++++reactance++++?
A. Opposition to DC caused by resistors
B. Opposition to AC caused by inductors and capacitors
C. A property of ideal resistors in AC circuits
D. A large spark produced at switch contacts when an
inductor is de-energized
3E-3.2 What is the opposition to the flow of AC caused by an
inductor called?
A. Resistance
B. Reluctance
C. Admittance
D. Reactance
3E-3.3 What is the opposition to the flow of AC caused by a
capacitor called?
A. Resistance
B. Reluctance
C. Admittance
D. Reactance
3E-3.4 How does a coil react to AC?
A. As the frequency of the applied AC increases, the
reactance decreases
B. As the amplitude of the applied AC increases, the
reactance also increases
C. As the amplitude of the applied AC increases, the
reactance decreases
D. As the frequency of the applied AC increases, the
reactance also increases
3E-3.5 How does a capacitor react to AC?
A. As the frequency of the applied AC increases, the
reactance decreases
B. As the frequency of the applied AC increases, the
reactance increases
C. As the amplitude of the applied AC increases, the
reactance also increases
D. As the amplitude of the applied AC increases, the
reactance decreases
3E-6.1 When will a power source deliver maximum output?
A. When the impedance of the load is equal to the impedance
of the source
B. When the SWR has reached a maximum value
C. When the power supply fuse rating equals the primary
winding current
D. When air wound transformers are used instead of iron core
transformers
3E-6.2 What is meant by ++++impedance matching++++?
A. To make the load impedance much greater than the source
impedance
B. To make the load impedance much less than the source
impedance
C. To use a balun at the antenna feed point
D. To make the load impedance equal the source impedance
3E-6.3 What occurs when the impedance of an electrical load is
equal to the internal impedance of the power source?
A. The source delivers minimum power to the load
B. There will be a high SWR condition
C. No current can flow through the circuit
D. The source delivers maximum power to the load
3E-6.4 Why is ++++impedance matching++++ important in radio work?
A. So the source can deliver maximum power to the load
B. So the load will draw minimum power from the source
C. To ensure that there is less resistance than reactance in
the circuit
D. To ensure that the resistance and reactance in the
circuit are equal
3E-7.2 What is the unit measurement of reactance?
A. Mho
B. Ohm
C. Ampere
D. Siemens
3E-7.4 What is the unit measurement of impedance?
A. Ohm
B. Volt
C. Ampere
D. Watt
3E-10.1 What is a ++++bel++++?
A. The basic unit used to describe a change in power levels
B. The basic unit used to describe a change in inductances
C. The basic unit used to describe a change in capacitances
D. The basic unit used to describe a change in resistances
3E-10.2 What is a ++++decibel++++?
A. A unit used to describe a change in power levels, equal
to 0.1 bel
B. A unit used to describe a change in power levels, equal
to 0.01 bel
C. A unit used to describe a change in power levels, equal
to 10 bels
D. A unit used to describe a change in power levels, equal
to 100 bels
3E-10.3 Under ideal conditions, a barely detectable change in
loudness is approximately how many dB?
A. 12 dB
B. 6 dB
C. 3 dB
D. 1 dB
3E-10.4 A two-times increase in power results in a change of how
many dB?
A. Multiplying the original power by 2 gives a new power
that is 1 dB higher
B. Multiplying the original power by 2 gives a new power
that is 3 dB higher
C. Multiplying the original power by 2 gives a new power
that is 6 dB higher
D. Multiplying the original power by 2 gives a new power
that is 12 dB higher
3E-10.5 An increase of 6 dB results from raising the power by how
many times?
A. Multiply the original power by 1.5 to get the new power
B. Multiply the original power by 2 to get the new power
C. Multiply the original power by 3 to get the new power
D. Multiply the original power by 4 to get the new power
3E-10.6 A decrease of 3 dB results from lowering the power by how
many times?
A. Divide the original power by 1.5 to get the new power
B. Divide the original power by 2 to get the new power
C. Divide the original power by 3 to get the new power
D. Divide the original power by 4 to get the new power
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?
A. S5
B. S7
C. S9
D. S9 plus 5 dB
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?
A. S5
B. S7
C. S9
D. S9 plus 10 dB
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?
A. S5
B. S7
C. S9
D. S9 plus 10 dB
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?
A. 10 amperes
B. 2 amperes
C. 1 ampere
D. 0.5 ampere
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?
A. The total current equals the average of the branch
current through each resistor
B. The total current equals the sum of the branch current
through each resistor
C. The total current decreases as more parallel resistors
are added to the circuit
D. 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
3E-13.1 How many watts of electrical power are being used when a
400-VDC power source supplies an 800 ohm load?
A. 0.5 watt
B. 200 watts
C. 400 watts
D. 320,000 watts
3E-13.2 How many watts of electrical power are being consumed by
a 12-VDC pilot light which draws 0.2-amperes?
A. 60 watts
B. 24 watts
C. 6 watts
D. 2.4 watts
3E-13.3 How many watts are being dissipated when 7.0-milliamperes
flows through 1.25 kilohms?
A. Approximately 61 milliwatts
B. Approximately 39 milliwatts
C. Approximately 11 milliwatts
D. Approximately 9 milliwatts
3E-14.1 How is the total resistance calculated for several
resistors in series?
A. The total resistance must be divided by the number of
resistors to ensure accurate measurement of resistance
B. The total resistance is always the lowest-rated
resistance
C. The total resistance is found by adding the individual
resistances together
D. The tolerance of each resistor must be raised
proportionally to the number of resistors
3E-14.2 What is the total resistance of two equal, parallel-
connected resistors?
A. Twice the resistance of either resistance
B. The sum of the two resistances
C. The total resistance cannot be determined without knowing
the exact resistances
D. Half the resistance of either resistor
3E-14.3 What is the total inductance of two equal, parallel-
connected inductors?
A. Half the inductance of either inductor, assuming no
mutual coupling
B. Twice the inductance of either inductor, assuming no
mutual coupling
C. The sum of the two inductances, assuming no mutual
coupling
D. The total inductance cannot be determined without knowing
the exact inductances
3E-14.4 What is the total capacitance of two equal, parallel-
connected capacitors?
A. Half the capacitance of either capacitor
B. Twice the capacitance of either capacitor
C. The value of either capacitor
D. The total capacitance cannot be determined without
knowing the exact capacitances
3E-14.5 What is the total resistance of two equal, series-
connected resistors?
A. Half the resistance of either resistor
B. Twice the resistance of either resistor
C. The value of either resistor
D. The total resistance cannot be determined without knowing
the exact resistances
3E-14.6 What is the total inductance of two equal, series-
connected inductors?
A. Half the inductance of either inductor, assuming no
mutual coupling
B. Twice the inductance of either inductor, assuming no
mutual coupling
C. The value of either inductor, assuming no mutual coupling
D. The total inductance cannot be determined without knowing
the exact inductances
3E-14.7 What is the total capacitance of two equal, series-
connected capacitors?
A. Half the capacitance of either capacitor
B. Twice the capacitance of either capacitor
C. The value of either capacitor
D. The total capacitance cannot be determined without
knowing the exact capacitances
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?
A. 2369 volts
B. 526.5 volts
C. 26 volts
D. 5.8 volts
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?
A. 4.47 to 1
B. 14.14 to 1
C. 20 to 1
D. 400 to 1
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?
A. 12.2 to 1
B. 24.4 to 1
C. 150 to 1
D. 300 to 1
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?
A. 576 ohms
B. 83.3 ohms
C. 7.0 ohms
D. 3.5 ohms
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. A DC voltage equal to the peak-to-peak value of the AC
voltage
B. A DC voltage equal to the RMS value of the AC voltage
C. A DC voltage equal to the average value of the AC voltage
D. A DC voltage equal to the peak value of the AC voltage
3E-16.2 What is the peak-to-peak voltage of a sine wave which has
an RMS voltage of 117-volts?
A. 82.7 volts
B. 165.5 volts
C. 183.9 volts
D. 330.9 volts
3E-16.3 A sine wave of 17-volts peak is equivalent to how many
volts RMS?
A. 8.5 volts
B. 12 volts
C. 24 volts
D. 34 volts
3F-1.5 What is the effect of an increase in ambient temperature
on the resistance of a carbon resistor?
A. The resistance will increase by 20% for every 10 degrees
centigrade that the temperature increases
B. The resistance stays the same
C. The resistance change depends on the resistor's
temperature coefficient rating
D. The resistance becomes time dependent
3F-2.6 What type of capacitor is often used in power supply
circuits to filter the rectified AC?
A. Disc ceramic
B. Vacuum variable
C. Mica
D. Electrolytic
3F-2.7 What type of capacitor is used in power supply circuits to
filter transient voltage spikes across the transformer secondary
winding?
A. High-value
B. Trimmer
C. Vacuum variable
D. Suppressor
3F-3.5 How do inductors become self-resonant?
A. Through distributed electromagnetism
B. Through eddy currents
C. Through distributed capacitance
D. Through parasitic hysteresis
3F-4.1 What circuit component can change 120-VAC to 400-VAC?
A. A transformer
B. A capacitor
C. A diode
D. An SCR
3F-4.2 What is the source of energy connected to in a
transformer?
A. To the secondary winding
B. To the primary winding
C. To the core
D. To the plates
3F-4.3 When there is no load attached to the secondary winding of
a transformer, what is current in the primary winding called?
A. Magnetizing current
B. Direct current
C. Excitation current
D. Stabilizing current
3F-4.4 In what terms are the primary and secondary windings
ratings of a power transformer usually specified?
A. Joules per second
B. Peak inverse voltage
C. Coulombs per second
D. Volts or volt-amperes
3F-5.1 What is the peak-inverse-voltage rating of a power supply
rectifier?
A. The highest transient voltage the diode will handle
B. 1.4 times the AC frequency
C. The maximum voltage to be applied in the non-conducting
direction
D. 2.8 times the AC frequency
3F-5.2 Why must silicon rectifier diodes be thermally protected?
A. Because of their proximity to the power transformer
B. Because they will be destroyed if they become too hot
C. Because of their susceptibility to transient voltages
D. Because of their use in high-voltage applications
3F-5.4 What are the two major ratings for silicon diode
rectifiers of the type used in power supply circuits which must
not be exceeded?
A. Peak load impedance; peak voltage
B. Average power; average voltage
C. Capacitive reactance; avalanche voltage
D. Peak inverse voltage; average forward current
3G-1.1 Why should a resistor and capacitor be wired in parallel
with power supply rectifier diodes?
A. To equalize voltage drops and guard against transient
voltage spikes
B. To ensure that the current through each diode is about
the same
C. To smooth the output waveform
D. To decrease the output voltage
3G-1.2 What function do capacitors serve when resistors and
capacitors are connected in parallel with high voltage power
supply rectifier diodes?
A. They double or triple the output voltage
B. They block the alternating current
C. They protect those diodes that develop back resistance
faster than other diodes
D. They regulate the output voltage
3G-1.3 What is the output waveform of an unfiltered full-wave
rectifier connected to a resistive load?
A. A steady DC voltage
B. A sine wave at half the frequency of the AC input
C. A series of pulses at the same frequency as the AC input
D. A series of pulses at twice the frequency of the AC input
3G-1.4 How many degrees of each cycle does a half-wave rectifier
utilize?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
3G-1.5 How many degrees of each cycle does a full-wave rectifier
utilize?
A. 90 degrees
B. 180 degrees
C. 270 degrees
D. 360 degrees
3G-1.6 Where is a power supply bleeder resistor connected?
A. Across the filter capacitor
B. Across the power-supply input
C. Between the transformer primary and secondary
D. Across the inductor in the output filter
3G-1.7 What components comprise a power supply filter network?
A. Diodes
B. Transformers and transistors
C. Quartz crystals
D. Capacitors and inductors
3G-1.8 What should be the peak-inverse-voltage rating of the
rectifier in a full-wave power supply?
A. One-quarter the normal output voltage of the power supply
B. Half the normal output voltage of the power supply
C. Equal to the normal output voltage of the power supply
D. Double the normal peak output voltage of the power supply
3G-1.9 What should be the peak-inverse-voltage rating of the
rectifier in a half-wave power supply?
A. One-quarter to one-half the normal peak output voltage of
the power supply
B. Half the normal output voltage of the power supply
C. Equal to the normal output voltage of the power supply
D. One to two times the normal peak output voltage of the
power supply
3G-2.8 What should the impedance of a low-pass filter be as
compared to the impedance of the transmission line into which it
is inserted?
A. Substantially higher
B. About the same
C. Substantially lower
D. Twice the transmission line impedance
3H-2.1 What is the term for alteration of the amplitude of an RF
wave for the purpose of conveying information?
A. Frequency modulation
B. Phase modulation
C. Amplitude rectification
D. Amplitude modulation
3H-2.3 What is the term for alteration of the phase of an RF wave
for the purpose of conveying information?
A. Pulse modulation
B. Phase modulation
C. Phase rectification
D. Amplitude modulation
3H-2.4 What is the term for alteration of the frequency of an RF
wave for the purpose of conveying information?
A. Phase rectification
B. Frequency rectification
C. Amplitude modulation
D. Frequency modulation
3H-3.1 In what emission type does the instantaneous amplitude
(envelope) of the RF signal vary in accordance with the
modulating AF?
A. Frequency shift keying
B. Pulse modulation
C. Frequency modulation
D. Amplitude modulation
3H-3.2 What determines the spectrum space occupied by each group
of sidebands generated by a correctly operating double-sideband
phone transmitter?
A. The audio frequencies used to modulate the transmitter
B. The phase angle between the audio and radio frequencies
being mixed
C. The radio frequencies used in the transmitter's VFO
D. The CW keying speed
3H-4.1 How much is the carrier suppressed in a single-sideband
phone transmission?
A. No more than 20 dB below peak output power
B. No more than 30 dB below peak output power
C. At least 40 dB below peak output power
D. At least 60 dB below peak output power
3H-4.2 What is one advantage of carrier suppression in a double-
sideband phone transmission?
A. Only half the bandwidth is required for the same
information content
B. Greater modulation percentage is obtainable with lower
distortion
C. More power can be put into the sidebands
D. Simpler equipment can be used to receive a double-
sideband suppressed-carrier signal
3H-5.1 Which one of the telephony emissions popular with amateurs
occupies the narrowest band of frequencies?
A. Single-sideband emission
B. Double-sideband emission
C. Phase-modulated emission
D. Frequency-modulated emission
3H-5.2 Which emission type is produced by a telephony transmitter
having a balanced modulator followed by a 2.5-kHz bandpass
filter?
A. PM
B. AM
C. SSB
D. FM
3H-7.2 What emission is produced by a reactance modulator
connected to an RF power amplifier?
A. Multiplex modulation
B. Phase modulation
C. Amplitude modulation
D. Pulse modulation
3H-8.1 What purpose does the carrier serve in a double-sideband
phone transmission?
A. The carrier separates the sidebands so they don't cancel
in the receiver
B. The carrier contains the modulation information
C. The carrier maintains symmetry of the sidebands to
prevent distortion
D. The carrier serves as a reference signal for demodulation
by an envelope detector
3H-8.2 What signal component appears in the center of the
frequency band of a double-sideband phone transmission?
A. The lower sidebands
B. The subcarrier
C. The carrier
D. The pilot tone
3H-9.1 What sidebands are generated by a double-sideband phone
transmitter with a 7250-kHz carrier when it is modulated less
than 100% by an 800-Hz pure sine wave?
A. 7250.8 kHz and 7251.6 kHz
B. 7250.0 kHz and 7250.8 kHz
C. 7249.2 kHz and 7250.8 kHz
D. 7248.4 kHz and 7249.2 kHz
3H-10.1 How many times over the maximum deviation is the
bandwidth of an FM-phone transmission?
A. 1.5
B. At least 2.0
C. At least 4.0
D. The bandwidth cannot be determined without knowing the
exact carrier and modulating frequencies involved
3H-10.2 What is the total bandwidth of an FM-phone transmission
having a 5-kHz deviation and a 3-kHz modulating frequency?
A. 3 kHz
B. 5 kHz
C. 8 kHz
D. 16 kHz
3H-11.1 What happens to the shape of the RF envelope, as viewed
on an oscilloscope, during double-sideband phone transmission?
A. The amplitude of the envelope increases and decreases in
proportion to the modulating signal
B. The amplitude of the envelope remains constant
C. The brightness of the envelope increases and decreases in
proportion to the modulating signal
D. The frequency of the envelope increases and decreases in
proportion to the amplitude of the modulating signal
3H-13.1 What results when a single-sideband phone transmitter is
overmodulated?
A. The signal becomes louder with no other effects
B. The signal occupies less bandwidth with poor high
frequency response
C. The signal has higher fidelity and improved signal-to-
noise ratio
D. The signal becomes distorted and occupies more bandwidth
3H-13.2 What results when a double-sideband phone transmitter is
overmodulated?
A. The signal becomes louder with no other effects
B. The signal becomes distorted and occupies more bandwidth
C. The signal occupies less bandwidth with poor high
frequency response
D. The transmitter's carrier frequency deviates
3H-15.1 What is the frequency deviation for a 12.21-MHz
reactance-modulated oscillator in a 5-kHz deviation, 146.52-MHz
FM-phone transmitter?
A. 41.67 Hz
B. 416.7 Hz
C. 5 kHz
D. 12 kHz
3H-15.2 What stage in a transmitter would translate a 5.3-MHz
input signal to 14.3-MHz?
A. A mixer
B. A beat frequency oscillator
C. A frequency multiplier
D. A linear translator stage
3H-16.4 How many frequency components are in the signal from an
AF shift keyer at any instant?
A. One
B. Two
C. Three
D. Four
3H-16.5 How is frequency shift related to keying speed in an FSK
signal?
A. The frequency shift in hertz must be at least four times
the keying speed in WPM
B. The frequency shift must not exceed 15 Hz per WPM of
keying speed
C. Greater keying speeds require greater frequency shifts
D. Greater keying speeds require smaller frequency shifts
3I-1.3 Why is a Yagi antenna often used for radio communications
on the 20-meter wavelength band?
A. It provides excellent omnidirectional coverage in the
horizontal plane
B. It is smaller, less expensive and easier to erect than a
dipole or vertical antenna
C. It discriminates against interference from other stations
off to the side or behind
D. It provides the highest possible angle of radiation for
the HF bands
3I-1.7 What method is best suited to match an unbalanced coaxial
feed line to a Yagi antenna?
A. "T" match
B. Delta match
C. Hairpin match
D. Gamma match
3I-1.9 How can the bandwidth of a parasitic beam antenna be
increased?
A. Use larger diameter elements
B. Use closer element spacing
C. Use traps on the elements
D. Use tapered-diameter elements
3I-2.1 How much gain over a half-wave dipole can a two-element
cubical quad antenna provide?
A. Approximately 0.6 dB
B. Approximately 2 dB
C. Approximately 6 dB
D. Approximately 12 dB
3I-3.1 How long is each side of a cubical quad antenna driven
element for 21.4-MHz?
A. 1.17 feet
B. 11.7 feet
C. 47 feet
D. 469 feet
3I-3.2 How long is each side of a cubical quad antenna driven
element for 14.3-MHz?
A. 1.75 feet
B. 17.6 feet
C. 23.4 feet
D. 70.3 feet
3I-3.3 How long is each side of a cubical quad antenna reflector
element for 29.6-MHz?
A. 8.23 feet
B. 8.7 feet
C. 9.7 feet
D. 34.8 feet
3I-3.4 How long is each leg of a symmetrical delta loop antenna
driven element for 28.7-MHz?
A. 8.75 feet
B. 11.32 feet
C. 11.7 feet
D. 35 feet
3I-3.5 How long is each leg of a symmetrical delta loop antenna
driven element for 24.9-MHz?
A. 10.09 feet
B. 13.05 feet
C. 13.45 feet
D. 40.36 feet
3I-3.6 How long is each leg of a symmetrical delta loop antenna
reflector element for 14.1-MHz?
A. 18.26 feet
B. 23.76 feet
C. 24.35 feet
D. 73.05 feet
3I-3.7 How long is the driven element of a Yagi antenna for 14.0-
MHz?
A. Approximately 17 feet
B. Approximately 33 feet
C. Approximately 35 feet
D. Approximately 66 feet
3I-3.8 How long is the director element of a Yagi antenna for
21.1-MHz?
A. Approximately 42 feet
B. Approximately 21 feet
C. Approximately 17 feet
D. Approximately 10.5 feet
3I-3.9 How long is the reflector element of a Yagi antenna for
28.1-MHz?
A. Approximately 8.75 feet
B. Approximately 16.6 feet
C. Approximately 17.5 feet
D. Approximately 35 feet
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?
A. Approximately 50 ohms, resistive
B. Approximately 73 ohms, resistive and inductive
C. Approximately 50 ohms, resistive and capacitive
D. Approximately 73 ohms, resistive
3I-5.2 What is the feed-point impedance of a quarter-wavelength
vertical HF antenna with a horizontal ground plane?
A. Approximately 18 ohms
B. Approximately 36 ohms
C. Approximately 52 ohms
D. Approximately 72 ohms
3I-5.3 What is an advantage of downward sloping radials on a
ground-plane antenna?
A. Sloping the radials downward lowers the radiation angle
B. Sloping the radials downward brings the feed-point
impedance close to 300 ohms
C. Sloping the radials downward allows rainwater to run off
the antenna
D. Sloping the radials downward brings the feed-point
impedance closer to 50 ohms
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?
A. The feed-point impedance decreases
B. The feed-point impedance increases
C. The feed-point impedance stays the same
D. The feed-point impedance becomes purely capacitive
3I-6.1 Compared to a dipole antenna, what are the directional
radiation characteristics of a cubical quad HF antenna?
A. The quad has more directivity in the horizontal plane but
less directivity in the vertical plane
B. The quad has less directivity in the horizontal plane but
more directivity in the vertical plane
C. The quad has more directivity in both horizontal and
vertical planes
D. The quad has less directivity in both horizontal and
vertical planes
3I-6.2 What is the radiation pattern of an ideal half-wavelength
dipole HF antenna?
A. If it is installed parallel to the earth, it radiates
well in a figure-eight pattern at right angles to the antenna
wire
B. If it is installed parallel to the earth, it radiates
well in a figure-eight pattern off both ends of the antenna wire
C. If it is installed parallel to the earth, it radiates
equally well in all directions
D. 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
3I-6.3 How does proximity to the ground affect the radiation
pattern of a horizontal dipole HF antenna?
A. If the antenna is too far from the ground, the pattern
becomes unpredictable
B. 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
C. A dipole antenna's radiation pattern is unaffected by its
distance to the ground
D. If the antenna is less than one-half wavelength from the
ground, radiation off the ends of the wire is reduced
3I-6.4 What does the term ++++antenna front-to-back ratio++++ mean?
A. The number of directors versus the number of reflectors
B. The relative position of the driven element with respect
to the reflectors and directors
C. The power radiated in the major radiation lobe compared
to the power radiated in exactly the opposite direction
D. The power radiated in the major radiation lobe compared
to the power radiated 90 degrees away from that direction
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?
A. The radiation pattern will not change appreciably
B. A major lobe will develop in the horizontal plane,
parallel to the two elements
C. A major lobe will develop in the vertical plane, away
from the ground
D. 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
3I-6.6 What is the meaning of the term ++++main lobe++++ as used in
reference to a directional antenna?
A. The direction of least radiation from an antenna
B. The point of maximum current in a radiating antenna
element
C. The direction of maximum radiated field strength from a
radiating antenna
D. The maximum voltage standing wave point on a radiating
element
3I-7.1 Upon what does the characteristic impedance of a parallel-
conductor antenna feed line depend?
A. The distance between the centers of the conductors and
the radius of the conductors
B. The distance between the centers of the conductors and
the length of the line
C. The radius of the conductors and the frequency of the
signal
D. The frequency of the signal and the length of the line
3I-7.2 What is the characteristic impedance of various coaxial
cables commonly used for antenna feed lines at amateur stations?
A. Around 25 and 30 ohms
B. Around 50 and 75 ohms
C. Around 80 and 100 ohms
D. Around 500 and 750 ohms
3I-7.3 What effect, if any, does the length of a coaxial cable
have upon its characteristic impedance?
A. The length has no effect on the characteristic impedance
B. The length affects the characteristic impedance primarily
above 144 MHz
C. The length affects the characteristic impedance primarily
below 144 MHz
D. The length affects the characteristic impedance at any
frequency
3I-7.4 What is the characteristic impedance of flat-ribbon TV-
type twinlead?
A. 50 ohms
B. 75 ohms
C. 100 ohms
D. 300 ohms
3I-8.4 What is the cause of power being reflected back down an
antenna feed line?
A. Operating an antenna at its resonant frequency
B. Using more transmitter power than the antenna can handle
C. A difference between feed line impedance and antenna
feed-point impedance
D. Feeding the antenna with unbalanced feed line
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?
A. 4:1
B. 1:4
C. 2:1
D. 1:2
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?
A. 2:1
B. 50:1
C. 1:5
D. 5:1
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?
A. 2:1
B. 50:50
C. 1:1
D. 0:0
3I-11.1 How does the characteristic impedance of a coaxial cable
affect the amount of attenuation to the RF signal passing through
it?
A. The attenuation is affected more by the characteristic
impedance at frequencies above 144 MHz than at frequencies below
144 MHz
B. The attenuation is affected less by the characteristic
impedance at frequencies above 144 MHz than at frequencies below
144 MHz
C. The attenuation related to the characteristic impedance
is about the same at all amateur frequencies below 1.5 GHz
D. The difference in attenuation depends on the emission
type in use
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?
A. The attenuation is greater at 2 meters
B. The attenuation is less at 2 meters
C. The attenuation is the same at both frequencies
D. The difference in attenuation depends on the emission
type in use
3I-11.4 What is the effect on its attenuation when flat-ribbon
TV-type twinlead is wet?
A. Attenuation decreases slightly
B. Attenuation remains the same
C. Attenuation decreases sharply
D. Attenuation increases
3I-11.7 Why might silicone grease or automotive car wax be
applied to flat-ribbon TV-type twinlead?
A. To reduce "skin effect" losses on the conductors
B. To reduce the buildup of dirt and moisture on the feed
line
C. To increase the velocity factor of the feed line
D. To help dissipate heat during high-SWR operation
3I-11.8 In what values are RF feed line losses usually expressed?
A. Bels/1000 ft
B. dB/1000 ft
C. Bels/100 ft
D. dB/100 ft
3I-11.10 As the operating frequency increases, what happens to
the dielectric losses in a feed line?
A. The losses decrease
B. The losses decrease to zero
C. The losses remain the same
D. The losses increase
3I-11.12 As the operating frequency decreases, what happens to
the dielectric losses in a feed line?
A. The losses decrease
B. The losses increase
C. The losses remain the same
D. The losses become infinite
3I-12.1 What condition must be satisfied to prevent standing
waves of voltage and current on an antenna feed line?
A. The antenna feed point must be at DC ground potential
B. The feed line must be an odd number of electrical quarter
wavelengths long
C. The feed line must be an even number of physical half
wavelengths long
D. The antenna feed-point impedance must be matched to the
characteristic impedance of the feed line
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?
A. An inductively coupled matching network is not normally
used in a resonant antenna system
B. An inductively coupled matching network is used to
increase the SWR to an acceptable level
C. 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
D. An inductively coupled matching network can be used at
the antenna feed point to tune out the radiation resistance
3I-12.5 What is an antenna-transmission line ++++mismatch++++?
A. A condition where the feed-point impedance of the antenna
does not equal the output impedance of the transmitter
B. A condition where the output impedance of the transmitter
does not equal the characteristic impedance of the feed line
C. 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
D. A condition where the characteristic impedance of the
feed line does not equal the feed-point impedance of the antenna
Answers
3A-3.2 A
3A-3.3 A
3A-3.4 C
3A-3.5 C
3A-3.7 A
3A-4.1 C
3A-4.3 C
3A-6.1 B
3A-6.2 C
3A-6.6 A
3A-8.6 D
3A-9.1 C
3A-9.2 A
3A-9.3 D
3A-9.4 A
3A-9.5 B
3A-9.6 C
3A-9.7 A
3A-9.8 A
3A-9.9 C
3A-9.10 B
3A-9.11 C
3A-9.12 A
3A-9.13 B
3A-9.14 C
3A-9.15 C
3A-9.16 C
3A-10.1 A
3A-10.2 C
3A-10.3 D
3A-10.4 C
3A-10.5 B
3A-10.6 C
3A-10.7 C
3A-10.8 C
3A-13.1 C
3A-13.2 D
3A-14.3 B
3A-14.6 A
3A-15.1 D
3A-15.3 C
3A-15.4 B
3A-16.1 C
3A-16.2 B
3A-16.3 A
3A-16.4 A
3B-1.4 C
3B-1.5 B
3B-2.1 B
3B-2.2 A
3B-2.3 C
3B-2.4 A
3B-2.6 B
3B-2.10 C
3B-2.11 D
3B-2.12 B
3B-3.8 A
3B-3.12 A
3B-4.1 A
3B-4.2 B
3B-5.1 D
3B-5.2 C
3B-6.1 B
3B-6.2 B
3B-6.3 B
3B-7.1 B
3B-7.2 A
3B-7.3 A
3B-7.4 C
3B-7.5 C
3B-8.1 C
3B-8.2 B
3B-8.3 B
3B-8.4 C
3B-8.5 C
3B-8.6 B
3B-8.7 C
3B-8.8 C
3B-8.9 C
3B-10.1 A
3B-10.2 B
3C-1.6 C
3C-1.7 B
3C-1.9 B
3C-1.10 A
3C-1.13 D
3C-2.3 C
3C-2.4 C
3C-3.3 B
3C-3.4 C
3C-5.1 B
3C-5.2 A
3C-5.3 B
3C-5.4 C
3C-5.5 A
3C-6.2 B
3C-6.4 D
3C-6.5 B
3C-6.6 D
3C-7.1 B
3C-7.2 D
3C-7.3 A
3C-7.4 D
3C-7.5 D
3C-7.6 A
3C-7.7 D
3C-7.8 C
3C-10.1 D
3C-10.2 A
3C-10.3 B
3C-10.4 D
3D-1.5 A
3D-1.6 A
3D-1.7 D
3D-1.8 C
3D-1.9 D
3D-2.4 B
3D-3.1 C
3D-3.2 C
3D-3.3 C
3D-3.4 D
3D-3.5 D
3D-4.1 A
3D-4.2 D
3D-4.3 C
3D-4.4 B
3D-4.5 B
3D-5.1 B
3D-5.5 A
3D-5.6 B
3D-5.7 B
3D-6.1 D
3D-6.2 A
3D-6.3 D
3D-6.4 B
3D-9.1 C
3D-9.2 A
3D-9.3 D
3D-10.1 B
3D-10.2 B
3D-10.3 C
3D-10.4 C
3D-10.5 A
3D-12.2 D
3D-12.3 B
3D-12.4 C
3D-12.5 D
3D-13.1 A
3D-13.2 C
3D-13.3 D
3D-14.6 B
3D-14.7 C
3D-15.1 B
3D-15.2 A
3D-15.3 B
3D-15.4 D
3D-17.2 A
3D-17.3 C
3D-17.4 A
3D-17.5 B
3D-17.6 C
3E-1.1 C
3E-1.2 C
3E-3.1 B
3E-3.2 D
3E-3.3 D
3E-3.4 D
3E-3.5 A
3E-6.1 A
3E-6.2 D
3E-6.3 D
3E-6.4 A
3E-7.2 B
3E-7.4 A
3E-10.1 A
3E-10.2 A
3E-10.3 D
3E-10.4 B
3E-10.5 D
3E-10.6 B
3E-10.7 C
3E-10.8 D
3E-10.9 C
3E-12.1 D
3E-12.3 B
3E-13.1 B
3E-13.2 D
3E-13.3 A
3E-14.1 C
3E-14.2 D
3E-14.3 A
3E-14.4 B
3E-14.5 B
3E-14.6 B
3E-14.7 A
3E-15.1 C
3E-15.2 A
3E-15.3 A
3E-15.4 D
3E-16.1 B
3E-16.2 D
3E-16.3 B
3F-1.5 C
3F-2.6 D
3F-2.7 D
3F-3.5 C
3F-4.1 A
3F-4.2 B
3F-4.3 A
3F-4.4 D
3F-5.1 C
3F-5.2 B
3F-5.4 D
3G-1.1 A
3G-1.2 C
3G-1.3 D
3G-1.4 B
3G-1.5 D
3G-1.6 A
3G-1.7 D
3G-1.8 D
3G-1.9 D
3G-2.8 B
3H-2.1 D
3H-2.3 B
3H-2.4 D
3H-3.1 D
3H-3.2 A
3H-4.1 C
3H-4.2 C
3H-5.1 A
3H-5.2 C
3H-7.2 B
3H-8.1 D
3H-8.2 C
3H-9.1 C
3H-10.1 B
3H-10.2 D
3H-11.1 A
3H-13.1 D
3H-13.2 B
3H-15.1 B
3H-15.2 A
3H-16.4 A
3H-16.5 C
3I-1.3 C
3I-1.7 D
3I-1.9 A
3I-2.1 C
3I-3.1 B
3I-3.2 B
3I-3.3 B
3I-3.4 C
3I-3.5 C
3I-3.6 C
3I-3.7 B
3I-3.8 B
3I-3.9 C
3I-5.1 D
3I-5.2 B
3I-5.3 D
3I-5.4 B
3I-6.1 C
3I-6.2 A
3I-6.3 B
3I-6.4 C
3I-6.5 D
3I-6.6 C
3I-7.1 A
3I-7.2 B
3I-7.3 A
3I-7.4 D
3I-8.4 C
3I-9.3 A
3I-9.4 D
3I-9.5 C
3I-11.1 C
3I-11.2 A
3I-11.4 D
3I-11.7 B
3I-11.8 D
3I-11.10 D
3I-11.12 A
3I-12.1 D
3I-12.2 A
3I-12.5 D