Ham Extra License Practice Quiz
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E0A06: Why are there separate electric (E) and magnetic (H) field MPE limits?
The body reacts to electromagnetic radiation from both the E and H fields
Ground reflections and scattering make the field impedance vary with location
E field and H field radiation intensity peaks can occur at different locations
All of these choices are correct
E1A09: What is the first action you should take if your digital message forwarding station inadvertently forwards a communication that violates FCC rules?
Discontinue forwarding the communication as soon as you become aware of it
Notify the originating station that the communication does not comply with FCC rules
Notify the nearest FCC Field Engineer's office
Discontinue forwarding all messages
E1B09: Which amateur stations may be operated in RACES?
Only those club stations licensed to Amateur Extra class operators
Any FCC-licensed amateur station except a Technician class operator's station
Any FCC-licensed amateur station certified by the responsible civil defense organization for the area served
Any FCC-licensed amateur station participating in the Military Affiliate Radio System (MARS)
E1C08: What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?
30 seconds
3 minutes
5 minutes
10 minutes
E1D04: What is an Earth station in the amateur satellite service?
An amateur station within 50 km of the Earth's surface intended for communications with amateur stations by means of objects in space
An amateur station that is not able to communicate using amateur satellites
An amateur station that transmits telemetry consisting of measurement of upper atmosphere data from space
Any amateur station on the surface of the Earth
E1E02: Where are the questions for all written US amateur license examinations listed?
In FCC Part 97
In a question pool maintained by the FCC
In a question pool maintained by all the VECs
In the appropriate FCC Report and Order
E1F03: Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?
It was purchased in used condition from an amateur operator and is sold to another amateur operator for use at that operator's station
The equipment dealer assembled it from a kit
It was imported from a manufacturer in a country that does not require certification of RF power amplifiers
It was imported from a manufacturer in another country, and it was certificated by that country's government
E2A12: What is one way to predict the location of a satellite at a given time?
By means of the Doppler data for the specified satellite
By subtracting the mean anomaly from the orbital inclination
By adding the mean anomaly to the orbital inclination
By calculations using the Keplerian elements for the specified satellite
E2B10: Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?
3 KHz
10 KHz
15 KHz
20 KHz
E2C09: How does the spread-spectrum technique of frequency hopping work?
If interference is detected by the receiver it will signal the transmitter to change frequencies
If interference is detected by the receiver it will signal the transmitter to wait until the frequency is clear
A pseudo-random binary bit stream is used to shift the phase of an RF carrier very rapidly in a particular sequence
The frequency of the transmitted signal is changed very rapidly according to a particular sequence also used by the receiving station
E2D05: Which of the following techniques is normally used by low Earth orbiting digital satellites to relay messages around the world?
Digipeating
Store-and-forward
Multi-satellite relaying
Node hopping
E2E09: Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?
RTTY
PACTOR
MT63
PSK31
E3A02: What characterizes libration fading of an Earth-Moon-Earth signal?
A slow change in the pitch of the CW signal
A fluttery irregular fading
A gradual loss of signal as the Sun rises
The returning echo is several Hertz lower in frequency than the transmitted signal
E3B05: Which amateur bands typically support long-path propagation?
160 to 40 meters
30 to 10 meters
160 to 10 meters
6 meters to 2 meters
E3C10: How does the performance of a horizontally polarized antenna mounted on the side of a hill compare with the same antenna mounted on flat ground?
The main lobe takeoff angle increases in the downhill direction
The main lobe takeoff angle decreases in the downhill direction
The horizontal beam width decreases in the downhill direction
The horizontal beam width increases in the uphill direction
E4A01: How does a spectrum analyzer differ from an oscilloscope?
A spectrum analyzer measures ionospheric reflection; an oscilloscope displays electrical signals
A spectrum analyzer displays the peak amplitude of signals; an oscilloscope displays the average amplitude of signals
A spectrum analyzer displays signals in the frequency domain; an oscilloscope displays signals in the time domain
A spectrum analyzer displays radio frequencies; an oscilloscope displays audio frequencies
E4B11: How should a portable antenna analyzer be connected when measuring antenna resonance and feed point impedance?
Loosely couple the analyzer near the antenna base
Connect the analyzer via a high-impedance transformer to the antenna
Connect the antenna and a dummy load to the analyzer
Connect the antenna feed line directly to the analyzer's connector
E4C05: What does a value of -174 dBm/Hz represent with regard to the noise floor of a receiver?
The minimum detectable signal as a function of receive frequency
The theoretical noise at the input of a perfect receiver at room temperature
The noise figure of a 1 Hz bandwidth receiver
The galactic noise contribution to minimum detectable signal
E4D02: Which of the following describes two problems caused by poor dynamic range in a communications receiver?
Cross-modulation of the desired signal and desensitization from strong adjacent signals
Oscillator instability requiring frequent retuning and loss of ability to recover the opposite sideband
Cross-modulation of the desired signal and insufficient audio power to operate the speaker
Oscillator instability and severe audio distortion of all but the strongest received signals
E4E04: How can conducted and radiated noise caused by an automobile alternator be suppressed?
By installing filter capacitors in series with the DC power lead and by installing a blocking capacitor in the field lead
By installing a noise suppression resistor and a blocking capacitor in both leads
By installing a high-pass filter in series with the radio's power lead and a low-pass filter in parallel with the field lead
By connecting the radio's power leads directly to the battery and by installing coaxial capacitors in line with the alternator leads
E5A01: What can cause the voltage across reactances in series to be larger than the voltage applied to them?
Resonance
Capacitance
Conductance
Resistance
E5B05: How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
0.02 seconds
0.04 seconds
20 seconds
40 seconds
E5C07: In polar coordinates, what is the impedance of a network comprised of a 100-ohm-reactance capacitor in parallel with a 100-ohm resistor?
31 ohms at an angle of -15 degrees
51 ohms at an angle of -25 degrees
71 ohms at an angle of -45 degrees
91 ohms at an angle of -65 degrees
E5D16: What is the power factor of an RL circuit having a 30 degree phase angle between the voltage and the current?
1.73
0.5
0.866
0.577
E6A08: What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
Corner frequency
Alpha rejection frequency
Beta cutoff frequency
Alpha cutoff frequency
E6B04: What type of semiconductor device is designed for use as a voltage-controlled capacitor?
Varactor diode
Tunnel diode
Silicon-controlled rectifier
Zener diode
E6C09: In Figure E6-5, what is the schematic symbol for an OR gate?
2
3
4
6
E6D07: What is the usable frequency range of inductors that use toroidal cores, assuming a correct selection of core material for the frequency being used?
From a few kHz to no more than 30 MHz
From less than 20 Hz to approximately 300 MHz
From approximately 10 Hz to no more than 3000 kHz
From about 100 kHz to at least 1000 GHz
E6E01: What is a crystal lattice filter?
A power supply filter made with interlaced quartz crystals
An audio filter made with four quartz crystals that resonate at 1-kHz intervals
A filter with wide bandwidth and shallow skirts made using quartz crystals
A filter with narrow bandwidth and steep skirts made using quartz crystals
E6F08: Why are optoisolators often used in conjunction with solid state circuits when switching 120 VAC?
Optoisolators provide a low impedance link between a control circuit and a power circuit
Optoisolators provide impedance matching between the control circuit and power circuit
Optoisolators provide a very high degree of electrical isolation between a control circuit and the circuit being switched
Optoisolators eliminate the effects of reflected light in the control circuit
E7A05: Which of the following is a circuit that continuously alternates between two states without an external clock?
Monostable multivibrator
J-K flip-flop
T flip-flop
Astable multivibrator
E7B09: Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a pi-network output circuit?
The loading capacitor is set to maximum capacitance and the tuning capacitor is adjusted for minimum allowable plate current
The tuning capacitor is set to maximum capacitance and the loading capacitor is adjusted for minimum plate permissible current
The loading capacitor is adjusted to minimum plate current while alternately adjusting the tuning capacitor for maximum allowable plate current
The tuning capacitor is adjusted for minimum plate current, while the loading capacitor is adjusted for maximum permissible plate current
E7C09: What type of digital signal processing filter might be used to generate an SSB signal?
An adaptive filter
A notch filter
A Hilbert-transform filter
An elliptical filter
E7D04: Which of the following types of linear voltage regulator usually make the most efficient use of the primary power source?
A series current source
A series regulator
A shunt regulator
A shunt current source
E7E06: Why is de-emphasis commonly used in FM communications receivers?
For compatibility with transmitters using phase modulation
To reduce impulse noise reception
For higher efficiency
To remove third-order distortion products
E7F02: Which of the following would be used to reduce a signal's frequency by a factor of ten?
A preamp
A prescaler
A marker generator
A flip-flop
E7G02: What is the effect of ringing in a filter?
An echo caused by a long time delay
A reduction in high frequency response
Partial cancellation of the signal over a range of frequencies
Undesired oscillations added to the desired signal
E7H06: Which of the following oscillator circuits are commonly used in VFOs?
Pierce and Zener
Colpitts and Hartley
Armstrong and deForest
Negative feedback and balanced feedback
E8A04: What is equivalent to the root-mean-square value of an AC voltage?
The AC voltage found by taking the square of the average value of the peak AC voltage
The DC voltage causing the same amount of heating in a given resistor as the corresponding peak AC voltage
The DC voltage causing the same amount of heating in a resistor as the corresponding RMS AC voltage
The AC voltage found by taking the square root of the average AC value
E8B07: When using a pulse-width modulation system, why is the transmitter's peak power greater than its average power?
The signal duty cycle is less than 100%
The signal reaches peak amplitude only when voice modulated
The signal reaches peak amplitude only when voltage spikes are generated within the modulator
The signal reaches peak amplitude only when the pulses are also amplitude modulated
E8C10: What spread-spectrum communications technique alters the center frequency of a conventional carrier many times per second in accordance with a pseudo-random list of channels?
Frequency hopping
Direct sequence
Time-domain frequency modulation
Frequency compandored spread-spectrum
E8D09: What is meant by circularly polarized electromagnetic waves?
Waves with an electric field bent into a circular shape
Waves with a rotating electric field
Waves that circle the Earth
Waves produced by a loop antenna
E9A08: What is meant by antenna gain?
The ratio relating the radiated signal strength of an antenna in the direction of maximum radiation to that of a reference antenna
The ratio of the signal in the forward direction to that in the opposite direction
The ratio of the amount of power radiated by an antenna compared to the transmitter output power
The final amplifier gain minus the transmission-line losses, including any phasing lines present
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
E9C04: Which of the following describes a basic unterminated rhombic antenna?
Unidirectional; four-sides, each side one quarter-wavelength long; terminated in a resistance equal to its characteristic impedance
Bidirectional; four-sides, each side one or more wavelengths long; open at the end opposite the transmission line connection
Four-sides; an LC network at each corner except for the transmission connection;
Four-sides, each of a different physical length
E9D12: What is one advantage of using a trapped antenna?
It has high directivity in the higher-frequency bands
It has high gain
It minimizes harmonic radiation
It may be used for multiband operation
E9E09: Which of these matching systems is an effective method of connecting a 50-ohm coaxial cable feed line to a grounded tower so it can be used as a vertical antenna?
Double-bazooka match
Hairpin match
Gamma match
All of these choices are correct
E9F11: What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?
The same as the characteristic impedance of the line
An inductive reactance
A capacitive reactance
The same as the input impedance of the final generator stage
E9G01: Which of the following can be calculated using a Smith chart?
Impedance along transmission lines
Radiation resistance
Antenna radiation pattern
Radio propagation
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
