Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
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
E1B05: What is the maximum bandwidth for a data emission on 60 meters?
60 Hz
170 Hz
1.5 kHz
2.8 kHz
E1C05: When may an automatically controlled station originate third party communications?
Never
Only when transmitting an RTTY or data emissions
When specifically agreed upon by the sending and receiving stations
When approved by the National Telecommunication and Information Administration
E1D10: Which amateur stations are eligible to be telecommand stations?
Any amateur station designated by NASA
Any amateur station so designated by the space station licensee, subject to the privileges of the class of operator license held by the control operator
Any amateur station so designated by the ITU
All of these choices are correct
E1E10: What must the administering VEs do after the administration of a successful examination for an amateur operator license?
They must collect and send the documents to the NCVEC for grading
They must collect and submit the documents to the coordinating VEC for grading
They must submit the application document to the coordinating VEC according to the coordinating VEC instructions
They must collect and send the documents to the FCC according to instructions
E1F10: What is the maximum transmitter power for an amateur station transmitting spread spectrum communications?
1 W
1.5 W
10 W
1.5 kW
E2A05: What do the letters in a satellite's mode designator specify?
Power limits for uplink and downlink transmissions
The location of the ground control station
The polarization of uplink and downlink signals
The uplink and downlink frequency ranges
E2B11: What is the function of the Vertical Interval Signaling (VIS) code transmitted as part of an SSTV transmission?
To lock the color burst oscillator in color SSTV images
To identify the SSTV mode being used
To provide vertical synchronization
To identify the call sign of the station transmitting
E2C02: Which of the following best describes the term "self-spotting" in regards to contest operating?
The generally prohibited practice of posting one's own call sign and frequency on a call sign spotting network
The acceptable practice of manually posting the call signs of stations on a call sign spotting network
A manual technique for rapidly zero beating or tuning to a station's frequency before calling that station
An automatic method for rapidly zero beating or tuning to a station's frequency before calling that station
E2D12: How does JT65 improve EME communications?
It can decode signals many dB below the noise floor using FEC
It controls the receiver to track Doppler shift
It supplies signals to guide the antenna to track the Moon
All of these choices are correct
E2E04: What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?
Selective fading has occurred
One of the signal filters has saturated
The receiver has drifted 5 kHz from the desired receive frequency
The mark and space signal have been inverted
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
E3C09: Which of the following is usually responsible for causing VHF signals to propagate for hundreds of miles?
D-region absorption
Faraday rotation
Tropospheric ducting
Ground wave
E4A04: Which of the following test instruments is used to display spurious signals from a radio transmitter?
A spectrum analyzer
A wattmeter
A logic analyzer
A time-domain reflectometer
E4B02: What is an advantage of using a bridge circuit to measure impedance?
It provides an excellent match under all conditions
It is relatively immune to drift in the signal generator source
The measurement is based on obtaining a signal null, which can be done very precisely
It can display results directly in Smith chart format
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
E5A11: What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?
157.8 Hz
315.6 Hz
47.3 kHz
23.67 kHz
E5B06: How long does it take for an initial charge of 800 V DC to decrease to 294 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
4.50 seconds
9 seconds
450 seconds
900 seconds
E5C01: In polar coordinates, what is the impedance of a network consisting of a 100-ohm-reactance inductor in series with a 100-ohm resistor?
121 ohms at an angle of 35 degrees
141 ohms at an angle of 45 degrees
161 ohms at an angle of 55 degrees
181 ohms at an angle of 65 degrees
E5D18: How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500 VA?
704 W
355 W
252 W
1.42 mW
E6A02: Which of the following semiconductor materials contains excess free electrons?
N-type
P-type
Bipolar
Insulated gate
E6B02: What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?
Much higher reverse voltage breakdown
Controlled reverse avalanche voltage
Enhanced carrier retention time
Less forward voltage drop
E6C12: What is BiCMOS logic?
A logic device with two CMOS circuits per package
An FET logic family based on bimetallic semiconductors
A logic family based on bismuth CMOS devices
An integrated circuit logic family using both bipolar and CMOS transistors
E6D13: What type of CRT deflection is better when high-frequency waveforms are to be displayed on the screen?
Electromagnetic
Tubular
Radar
Electrostatic
E6E06: What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?
The ability to retrieve information from a single signal even in the presence of other strong signals.
Plate current that is controlled by a control grid
Nearly infinite gain, very high input impedance, and very low output impedance
Controlled gain, low noise figure, and constant input and output impedance over the specified frequency range
E6F09: What is the efficiency of a photovoltaic cell?
The output RF power divided by the input dc power
The effective payback period
The open-circuit voltage divided by the short-circuit current under full illumination
The relative fraction of light that is converted to current
E7A14: What is a JK flip-flop?
A flip-flop similar to an RS except that it toggles when both J and K are high
A flip-flop utilizing low power, low temperature Joule-Kelvin devices
A flip-flop similar to a D flip-flop except that it triggers on the negative clock edge
A flip-flop originally developed in Japan and Korea which has very low power consumption
E7B20: What is a parametric amplifier?
A type of bipolar operational amplifier with excellent linearity derived from use of very high voltage on the collector
A low-noise VHF or UHF amplifier relying on varying reactance for amplification
A high power amplifier for HF application utilizing the Miller effect to increase gain
An audio push-pull amplifier using silicon carbide transistors for extremely low noise
E7C01: How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?
Two inductors are in series between the input and output, and a capacitor is connected between the two inductors and ground
Two capacitors are in series between the input and output and an inductor is connected between the two capacitors and ground
An inductor is connected between the input and ground, another inductor is connected between the output and ground, and a capacitor is connected between the input and output
A capacitor is connected between the input and ground, another capacitor is connected between the output and ground, and an inductor is connected between input and output
E7D01: What is one characteristic of a linear electronic voltage regulator?
It has a ramp voltage as its output
It eliminates the need for a pass transistor
The control element duty cycle is proportional to the line or load conditions
The conduction of a control element is varied to maintain a constant output voltage
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
E7G10: What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?
1
0.03
38
76
E7H13: What is the capture range of a phase-locked loop circuit?
The frequency range over which the circuit can lock
The voltage range over which the circuit can lock
The input impedance range over which the circuit can lock
The range of time it takes the circuit to lock
E8A02: What type of wave has a rise time significantly faster than its fall time (or vice versa)?
A cosine wave
A square wave
A sawtooth wave
A sine wave
E8B11: Which of the following describes frequency division multiplexing?
The transmitted signal jumps from band to band at a predetermined rate
Two or more information streams are merged into a "baseband", which then modulates the transmitter
The transmitted signal is divided into packets of information
Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter
E8C02: What are some of the differences between the Baudot digital code and ASCII?
Baudot uses four data bits per character, ASCII uses seven or eight; Baudot uses one character as a shift code, ASCII has no shift code
Baudot uses five data bits per character, ASCII uses seven or eight; Baudot uses two characters as shift codes, ASCII has no shift code
Baudot uses six data bits per character, ASCII uses seven or eight; Baudot has no shift code, ASCII uses two characters as shift codes
Baudot uses seven data bits per character, ASCII uses eight; Baudot has no shift code, ASCII uses two characters as shift codes
E8D03: What input-amplitude parameter is valuable in evaluating the signal-handling capability of a Class A amplifier?
Peak voltage
RMS voltage
Average power
Resting voltage
E9A06: What is included in the total resistance of an antenna system?
Radiation resistance plus space impedance
Radiation resistance plus transmission resistance
Transmission-line resistance plus radiation resistance
Radiation resistance plus ohmic resistance
E9B06: If the boom of a Yagi antenna is lengthened and the elements are properly retuned, what usually occurs?
The gain increases
The SWR decreases
The front-to-back ratio increases
The gain bandwidth decreases rapidly
E9C05: What are the disadvantages of a terminated rhombic antenna for the HF bands?
The antenna has a very narrow operating bandwidth
The antenna produces a circularly polarized signal
The antenna requires a large physical area and 4 separate supports
The antenna is more sensitive to man-made static than any other type
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
E9E11: What is an effective way of matching a feed line to a VHF or UHF antenna when the impedances of both the antenna and feed line are unknown?
Use a 50-ohm 1:1 balun between the antenna and feed line
Use the "universal stub" matching technique
Connect a series-resonant LC network across the antenna feed terminals
Connect a parallel-resonant LC network across the antenna feed terminals
E9F15: What impedance does a 1/2-wavelength transmission line present to a generator when the line is open at the far end?
Very high impedance
Very low impedance
The same as the characteristic impedance of the line
The same as the output impedance of the generator
E9G02: What type of coordinate system is used in a Smith chart?
Voltage circles and current arcs
Resistance circles and reactance arcs
Voltage lines and current chords
Resistance lines and reactance chords
E9H06: What is the triangulation method of direction finding?
The geometric angle of sky waves from the source are used to determine its position
A fixed receiving station plots three headings from the signal source on a map
Antenna headings from several different receiving locations are used to locate the signal source
A fixed receiving station uses three different antennas to plot the location of the signal source
