Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
E0A07: How may dangerous levels of carbon monoxide from an emergency generator be detected?
By the odor
Only with a carbon monoxide detector
Any ordinary smoke detector can be used
By the yellowish appearance of the gas
E1A13: Who must be in physical control of the station apparatus of an amateur station aboard any vessel or craft that is documented or registered in the United States?
Only a person with an FCC Marine Radio
Any person holding an FCC-issued amateur license or who is authorized for alien reciprocal operation
Only a person named in an amateur station license grant
Any person named in an amateur station license grant or a person holding an unrestricted Radiotelephone Operator Permit
E1B03: Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?
1 mile
3 miles
10 miles
30 miles
E1C06: Which of the following statements concerning remotely controlled amateur stations is true?
Only Extra Class operators may be the control operator of a remote station
A control operator need not be present at the control point
A control operator must be present at the control point
Repeater and auxiliary stations may not be remotely controlled
E1D01: What is the definition of the term telemetry?
One-way transmission of measurements at a distance from the measuring instrument
Two-way radiotelephone transmissions in excess of 1000 feet
Two-way single channel transmissions of data
One-way transmission that initiates, modifies, or terminates the functions of a device at a distance
E1E05: What is the minimum passing score on amateur operator license examinations?
Minimum passing score of 70%
Minimum passing score of 74%
Minimum passing score of 80%
Minimum passing score of 77%
E1F12: Who may be the control operator of an auxiliary station?
Any licensed amateur operator
Only Technician, General, Advanced or Amateur Extra Class operators
Only General, Advanced or Amateur Extra Class operators
Only Amateur Extra Class operators
E2A06: On what band would a satellite receive signals if it were operating in mode U/V?
435-438 MHz
144-146 MHz
50.0-50.2 MHz
29.5 to 29.7 MHz
E2B07: What is the name of the signal component that carries color information in NTSC video?
Luminance
Chroma
Hue
Spectral Intensity
E2C12: What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?
Switch to a higher frequency HF band
Switch to a lower frequency HF band
Wait 90 minutes or so for the signal degradation to pass
Wait 24 hours before attempting another communication on the band
E2D07: Which of the following digital protocols is used by APRS?
PACTOR
802.11
AX.25
AMTOR
E2E08: Which of the following HF digital modes can be used to transfer binary files?
Hellschreiber
PACTOR
RTTY
AMTOR
E3A05: Which of the following describes a method of establishing EME contacts?
Time synchronous transmissions with each station alternating
Storing and forwarding digital messages
Judging optimum transmission times by monitoring beacons from the Moon
High speed CW identification to avoid fading
E3B02: What is the approximate maximum range for signals using transequatorial propagation?
1000 miles
2500 miles
5000 miles
7500 miles
E3C02: What is the cause of Aurora activity?
The interaction between the solar wind and the Van Allen belt
A low sunspot level combined with tropospheric ducting
The interaction of charged particles from the Sun with the Earth's magnetic field and the ionosphere
Meteor showers concentrated in the northern latitudes
E4A03: Which of the following parameters would a spectrum analyzer display on the vertical axis?
Amplitude
Duration
SWR
Q
E4B15: Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?
The inductance to capacitance ratio
The frequency shift
The bandwidth of the circuit's frequency response
The resonant frequency of the circuit
E4C01: What is an effect of excessive phase noise in the local oscillator section of a receiver?
It limits the receiver's ability to receive strong signals
It reduces receiver sensitivity
It decreases receiver third-order intermodulation distortion dynamic range
It can cause strong signals on nearby frequencies to interfere with reception of weak signals
E4D07: Which of the following describes the most significant effect of an off-frequency signal when it is causing cross-modulation interference to a desired signal?
A large increase in background noise
A reduction in apparent signal strength
The desired signal can no longer be heard
The off-frequency unwanted signal is heard in addition to the desired signal
E4E10: What is a common characteristic of interference caused by a touch controlled electrical device?
The interfering signal sounds like AC hum on an AM receiver or a carrier modulated by 60 Hz hum on a SSB or CW receiver
The interfering signal may drift slowly across the HF spectrum
The interfering signal can be several kHz in width and usually repeats at regular intervals across a HF band
All of these choices are correct
E5A10: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 1.8 MHz and a Q of 95?
18.9 kHz
1.89 kHz
94.5 kHz
9.45 kHz
E5B11: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?
14 degrees with the voltage lagging the current
14 degrees with the voltage leading the current
76 degrees with the voltage lagging the current
76 degrees with the voltage leading the current
E5C06: In polar coordinates, what is the impedance of a network consisting of a 100-ohm-reactance capacitor in series with a 100-ohm resistor?
121 ohms at an angle of -25 degrees
191 ohms at an angle of -85 degrees
161 ohms at an angle of -65 degrees
141 ohms at an angle of -45 degrees
E5D01: What is the result of skin effect?
As frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface
As frequency decreases, RF current flows in a thinner layer of the conductor, closer to the surface
Thermal effects on the surface of the conductor increase the impedance
Thermal effects on the surface of the conductor decrease the impedance
E6A07: In Figure E6-1, what is the schematic symbol for a PNP transistor?
1
2
4
5
E6B10: In Figure E6-3, what is the schematic symbol for a light-emitting diode?
1
5
6
7
E6C13: Which of the following is an advantage of BiCMOS logic?
Its simplicity results in much less expensive devices than standard CMOS
It is totally immune to electrostatic damage
It has the high input impedance of CMOS and the low output impedance of bipolar transistors
All of these choices are correct
E6D13: What type of CRT deflection is better when high-frequency waveforms are to be displayed on the screen?
Electromagnetic
Tubular
Radar
Electrostatic
E6E11: Which of the following materials is likely to provide the highest frequency of operation when used in MMICs?
Silicon
Silicon nitride
Silicon dioxide
Gallium nitride
E6F02: What happens to the conductivity of a photoconductive material when light shines on it?
It increases
It decreases
It stays the same
It becomes unstable
E7A06: What is a characteristic of a monostable multivibrator?
It switches momentarily to the opposite binary state and then returns, after a set time, to its original state
It is a clock that produces a continuous square wave oscillating between 1 and 0
It stores one bit of data in either a 0 or 1 state
It maintains a constant output voltage, regardless of variations in the input voltage
E7B02: What is a Class D amplifier?
A type of amplifier that uses switching technology to achieve high efficiency
A low power amplifier using a differential amplifier for improved linearity
An amplifier using drift-mode FETs for high efficiency
A frequency doubling amplifier
E7C13: What is one advantage of a Pi matching network over an L matching network consisting of a single inductor and a single capacitor?
The Q of Pi networks can be varied depending on the component values chosen
L networks cannot perform impedance transformation
Pi networks have fewer components
Pi networks are designed for balanced input and output
E7D07: What is the purpose of C2 in the circuit shown in Figure E7-3?
It bypasses hum around D1
It is a brute force filter for the output
To self-resonate at the hum frequency
To provide fixed DC bias for Q1
E7E12: What is a frequency discriminator stage in a FM receiver?
An FM generator circuit
A circuit for filtering two closely adjacent signals
An automatic band-switching circuit
A circuit for detecting FM signals
E7F06: What is one purpose of a marker generator?
To add audio markers to an oscilloscope
To provide a frequency reference for a phase locked loop
To provide a means of calibrating a receiver's frequency settings
To add time signals to a transmitted signal
E7G15: What is the typical output impedance of an integrated circuit op-amp?
Very low
Very high
100 ohms
1000 ohms
E7H01: What are three oscillator circuits used in Amateur Radio equipment?
Taft, Pierce and negative feedback
Pierce, Fenner and Beane
Taft, Hartley and Pierce
Colpitts, Hartley and Pierce
E8A01: What type of wave is made up of a sine wave plus all of its odd harmonics?
A square wave
A sine wave
A cosine wave
A tangent wave
E8B04: What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2-kHz modulating frequency?
6000
3
2000
1/3
E8C09: Which of these techniques causes a digital signal to appear as wide-band noise to a conventional receiver?
Spread-spectrum
Independent sideband
Regenerative detection
Exponential addition
E8D12: What is the peak voltage of a sinusoidal waveform if an RMS-reading voltmeter reads 34 volts?
123 volts
96 volts
55 volts
48 volts
E9A12: Which of the following factors determines ground losses for a ground-mounted vertical antenna operating in the 3-30 MHz range?
The standing-wave ratio
Distance from the transmitter
Soil conductivity
Take-off angle
E9B14: What type of information can be obtained by submitting the details of a proposed new antenna to a modeling program?
SWR vs. frequency charts
Polar plots of the far-field elevation and azimuth patterns
Antenna gain
All of these choices are correct
E9C11: How is the far-field elevation pattern of a vertically polarized antenna affected by being mounted over seawater versus rocky ground?
The low-angle radiation decreases
The high-angle radiation increases
Both the high- and low-angle radiation decrease
The low-angle radiation increases
E9D04: Why is it desirable for a ground-mounted satellite communications antenna system to be able to move in both azimuth and elevation?
In order to track the satellite as it orbits the Earth
So the antenna can be pointed away from interfering signals
So the antenna can be positioned to cancel the effects of Faraday rotation
To rotate antenna polarization to match that of the satellite
E9E07: What term best describes the interactions at the load end of a mismatched transmission line?
Characteristic impedance
Reflection coefficient
Velocity factor
Dielectric constant
E9F07: How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?
Lower loss
Higher SWR
Smaller reflection coefficient
Lower velocity factor
E9G06: On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?
Prime axis
Reactance axis
Impedance axis
Polar axis
E9H05: What is the main drawback of a wire-loop antenna for direction finding?
It has a bidirectional pattern
It is non-rotatable
It receives equally well in all directions
It is practical for use only on VHF bands
