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
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
E1B06: Which of the following additional rules apply if you are installing an amateur station antenna at a site at or near a public use airport?
You may have to notify the Federal Aviation Administration and register it with the FCC as required by Part 17 of FCC rules
No special rules apply if your antenna structure will be less than 300 feet in height
You must file an Environmental Impact Statement with the EPA before construction begins
You must obtain a construction permit from the airport zoning authority
E1C10: What types of amateur stations may automatically retransmit the radio signals of other amateur stations?
Only beacon, repeater or space stations
Only auxiliary, repeater or space stations
Only earth stations, repeater stations or model craft
Only auxiliary, beacon or space stations
E1D06: Which of the following special provisions must a space station incorporate in order to comply with space station requirements?
The space station must be capable of terminating transmissions by telecommand when directed by the FCC
The space station must cease all transmissions after 5 years
The space station must be capable of changing its orbit whenever such a change is ordered by NASA
All of these choices are correct
E1E03: What is a Volunteer Examiner Coordinator?
A person who has volunteered to administer amateur operator license examinations
A person who has volunteered to prepare amateur operator license examinations
An organization that has entered into an agreement with the FCC to coordinate amateur operator license examinations
The person who has entered into an agreement with the FCC to be the VE session manager
E1F14: Under what circumstances might the FCC issue a "Special Temporary Authority" (STA) to an amateur station?
To provide for experimental amateur communications
To allow regular operation on Land Mobile channels
To provide additional spectrum for personal use
To provide temporary operation while awaiting normal licensing
E2A11: What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?
A linearly polarized antenna
A circularly polarized antenna
An isotropic antenna
A log-periodic dipole array
E2B01: How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?
30
60
90
120
E2C06: During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?
At the top of each band, usually in a segment reserved for contests
In the middle of each band, usually on the national calling frequency
In the weak signal segment of the band, with most of the activity near the calling frequency
In the middle of the band, usually 25 kHz above the national calling frequency
E2D09: Under clear communications conditions, which of these digital communications modes has the fastest data throughput?
AMTOR
170-Hz shift, 45 baud RTTY
PSK31
300-baud packet
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
E3A08: When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
The E layer
The F1 layer
The F2 layer
The D layer
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
E4A12: Which of the following procedures is an important precaution to follow when connecting a spectrum analyzer to a transmitter output?
Use high quality double shielded coaxial cables to reduce signal losses
Attenuate the transmitter output going to the spectrum analyzer
Match the antenna to the load
All of these choices are correct
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
E4D03: How can intermodulation interference between two repeaters occur?
When the repeaters are in close proximity and the signals cause feedback in the final amplifier of one or both transmitters
When the repeaters are in close proximity and the signals mix in the final amplifier of one or both transmitters
When the signals from the transmitters are reflected out of phase from airplanes passing overhead
When the signals from the transmitters are reflected in phase from airplanes passing overhead
E4E13: What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?
Arcing contacts in a thermostatically controlled device
A defective doorbell or doorbell transformer inside a nearby residence
A malfunctioning illuminated advertising display
All of these choices are correct
E5A03: What is the magnitude of the impedance of a series RLC circuit at resonance?
High, as compared to the circuit resistance
Approximately equal to capacitive reactance
Approximately equal to inductive reactance
Approximately equal to circuit resistance
E5B12: What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 75 ohms, R is 100 ohms, and XL is 50 ohms?
76 degrees with the voltage lagging the current
14 degrees with the voltage leading the current
14 degrees with the voltage lagging the current
76 degrees with the voltage leading the current
E5C16: In polar coordinates, what is the impedance of a circuit that has an admittance of 7.09 millisiemens at 45 degrees?
5.03 E-06 ohms at an angle of 45 degrees
141 ohms at an angle of -45 degrees
19,900 ohms at an angle of -45 degrees
141 ohms at an angle of 45 degrees
E5D04: What unit measures electrical energy stored in an electrostatic field?
Coulomb
Joule
Watt
Volt
E6A11: In Figure E6-2, what is the schematic symbol for a P-channel junction FET?
1
2
3
6
E6B05: What characteristic of a PIN diode makes it useful as an RF switch or attenuator?
Extremely high reverse breakdown voltage
Ability to dissipate large amounts of power
Reverse bias controls its forward voltage drop
A large region of intrinsic material
E6C04: Which of the following is the primary advantage of tri-state logic?
Low power consumption
Ability to connect many device outputs to a common bus
High speed operation
More efficient arithmetic operations
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
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
E7A08: What logical operation does an OR gate perform?
It produces a logic "1" at its output if any or all inputs are logic "1"
It produces a logic "0" at its output if all inputs are logic "1"
It only produces a logic "0" at its output when all inputs are logic "1"
It produces a logic "1" at its output if all inputs are logic "0"
E7B05: What can be done to prevent unwanted oscillations in an RF power amplifier?
Tune the stage for maximum SWR
Tune both the input and output for maximum power
Install parasitic suppressors and/or neutralize the stage
Use a phase inverter in the output filter
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
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
E7E13: Which of the following describes a common means of generating an SSB signal when using digital signal processing?
Mixing products are converted to voltages and subtracted by adder circuits
A frequency synthesizer removes the unwanted sidebands
Emulation of quartz crystal filter characteristics
The quadrature method
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
E7G04: Which of the following is a type of capacitor best suited for use in high-stability op-amp RC active filter circuits?
Electrolytic
Disc ceramic
Polystyrene
Paper
E7H12: Which of the following is a principal component of a direct digital synthesizer (DDS)?
Phase splitter
Hex inverter
Chroma demodulator
Phase accumulator
E8A05: What would be the most accurate way of measuring the RMS voltage of a complex waveform?
By using a grid dip meter
By measuring the voltage with a D'Arsonval meter
By using an absorption wavemeter
By measuring the heating effect in a known resistor
E8B05: What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?
60
0.167
0.6
1.67
E8C01: Which one of the following digital codes consists of elements having unequal length?
ASCII
AX.25
Baudot
Morse code
E8D04: What is the PEP output of a transmitter that develops a peak voltage of 30 volts into a 50-ohm load?
4.5 watts
9 watts
16 watts
18 watts
E9A10: How is antenna efficiency calculated?
(radiation resistance / transmission resistance) x 100%
(radiation resistance / total resistance) x 100%
(total resistance / radiation resistance) x 100%
(effective radiated power / transmitter output) x 100%
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
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
E9D11: What is the function of a loading coil as used with an HF mobile antenna?
To increase the SWR bandwidth
To lower the losses
To lower the Q
To cancel capacitive reactance
E9E10: Which of these choices is an effective way to match an antenna with a 100-ohm feed point impedance to a 50-ohm coaxial cable feed line?
Connect a 1/4-wavelength open stub of 300-ohm twin-lead in parallel with the coaxial feed line where it connects to the antenna
Insert a 1/2 wavelength piece of 300-ohm twin-lead in series between the antenna terminals and the 50-ohm feed cable
Insert a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series between the antenna terminals and the 50-ohm feed cable
Connect 1/2 wavelength shorted stub of 75-ohm cable in parallel with the 50-ohm cable where it attaches to the antenna
E9F05: What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 14.1 MHz?
20 meters
2.3 meters
3.5 meters
0.2 meters
E9G08: What is the process of normalization with regard to a Smith chart?
Reassigning resistance values with regard to the reactance axis
Reassigning reactance values with regard to the resistance axis
Reassigning impedance values with regard to the prime center
Reassigning prime center with regard to the reactance axis
E9H12: What is an advantage of using a shielded loop antenna for direction finding?
It automatically cancels ignition noise pickup in mobile installations
It is electro-statically balanced against ground, giving better nulls
It eliminates tracking errors caused by strong out-of-band signals
It allows stations to communicate without giving away their position
