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
E1B02: Which of the following factors might cause the physical location of an amateur station apparatus or antenna structure to be restricted?
The location is near an area of political conflict
The location is of geographical or horticultural importance
The location is in an ITU zone designated for coordination with one or more foreign governments
The location is of environmental importance or significant in American history, architecture, or culture
E1C07: What is meant by local control?
Controlling a station through a local auxiliary link
Automatically manipulating local station controls
Direct manipulation of the transmitter by a control operator
Controlling a repeater using a portable handheld transceiver
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
E1E01: What is the minimum number of qualified VEs required to administer an Element 4 amateur operator license examination?
5
2
4
3
E1F06: What is the National Radio Quiet Zone?
An area in Puerto Rico surrounding the Aricebo Radio Telescope
An area in New Mexico surrounding the White Sands Test Area
An area surrounding the National Radio Astronomy Observatory
An area in Florida surrounding Cape Canaveral
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
E2B17: What is the approximate bandwidth of a slow-scan TV signal?
600 Hz
3 kHz
2 MHz
6 MHz
E2C07: What is the Cabrillo format?
A standard for submission of electronic contest logs
A method of exchanging information during a contest QSO
The most common set of contest rules
The rules of order for meetings between contest sponsors
E2D08: Which of the following types of packet frames is used to transmit APRS beacon data?
Unnumbered Information
Disconnect
Acknowledgement
Connect
E2E08: Which of the following HF digital modes can be used to transfer binary files?
Hellschreiber
PACTOR
RTTY
AMTOR
E3A09: Which of the following frequency ranges is well suited for meteor-scatter communications?
1.8 - 1.9 MHz
10 - 14 MHz
28 - 148 MHz
220 - 450 MHz
E3B08: What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?
Transequatorial
Sporadic-E
Long-path
Gray-line
E3C12: How does the maximum distance of ground-wave propagation change when the signal frequency is increased?
It stays the same
It increases
It decreases
It peaks at roughly 14 MHz
E4A07: Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?
Antenna analyzers automatically tune your antenna for resonance
Antenna analyzers do not need an external RF source
Antenna analyzers display a time-varying representation of the modulation envelope
All of these choices are correct
E4B13: How is the compensation of an oscilloscope probe typically adjusted?
A square wave is displayed and the probe is adjusted until the horizontal portions of the displayed wave are as nearly flat as possible
A high frequency sine wave is displayed and the probe is adjusted for maximum amplitude
A frequency standard is displayed and the probe is adjusted until the deflection time is accurate
A DC voltage standard is displayed and the probe is adjusted until the displayed voltage is accurate
E4C07: What does the MDS of a receiver represent?
The meter display sensitivity
The minimum discernible signal
The multiplex distortion stability
The maximum detectable spectrum
E4D05: What transmitter frequencies would cause an intermodulation-product signal in a receiver tuned to 146.70 MHz when a nearby station transmits on 146.52 MHz?
146.34 MHz and 146.61 MHz
146.88 MHz and 146.34 MHz
146.10 MHz and 147.30 MHz
173.35 MHz and 139.40 MHz
E4E06: What is a major cause of atmospheric static?
Solar radio frequency emissions
Thunderstorms
Geomagnetic storms
Meteor showers
E5A14: What is the resonant frequency of a series RLC circuit if R is 22 ohms, L is 50 microhenrys and C is 40 picofarads?
44.72 MHz
22.36 MHz
3.56 MHz
1.78 MHz
E5B03: The capacitor in an RC circuit is discharged to what percentage of the starting voltage after two time constants?
86.5%
63.2%
36.8%
13.5%
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
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
E6A04: What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
Insulator impurity
N-type impurity
Acceptor impurity
Donor impurity
E6B08: Which of the following describes a type of semiconductor diode?
Metal-semiconductor junction
Electrolytic rectifier
CMOS-field effect
Thermionic emission diode
E6C09: In Figure E6-5, what is the schematic symbol for an OR gate?
2
3
4
6
E6D15: What is the principle advantage of liquid-crystal display (LCD) devices over other types of display devices?
They consume less power
They can display changes instantly
They are visible in all light conditions
They can be easily interchanged with other display devices
E6E05: Which of the following noise figure values is typical of a low-noise UHF preamplifier?
2 dB
-10 dB
44 dBm
-20 dBm
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
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
E7B01: For what portion of a signal cycle does a Class AB amplifier operate?
More than 180 degrees but less than 360 degrees
Exactly 180 degrees
The entire cycle
Less than 180 degrees
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
E7D10: What is the purpose of C3 in the circuit shown in Figure E7-3?
It prevents self-oscillation
It provides brute force filtering of the output
It provides fixed bias for Q1
It clips the peaks of the ripple
E7E10: How does a diode detector function?
By rectification and filtering of RF signals
By breakdown of the Zener voltage
By mixing signals with noise in the transition region of the diode
By sensing the change of reactance in the diode with respect to frequency
E7F10: What alternate method of determining frequency, other than by directly counting input pulses, is used by some counters?
GPS averaging
Period measurement plus mathematical computation
Prescaling
D/A conversion
E7G15: What is the typical output impedance of an integrated circuit op-amp?
Very low
Very high
100 ohms
1000 ohms
E7H04: How is positive feedback supplied in a Colpitts oscillator?
Through a tapped coil
Through link coupling
Through a capacitive divider
Through a neutralizing capacitor
E8A14: Which of these methods is commonly used to convert analog signals to digital signals?
Sequential sampling
Harmonic regeneration
Level shifting
Phase reversal
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
E8C03: What is one advantage of using the ASCII code for data communications?
It includes built-in error-correction features
It contains fewer information bits per character than any other code
It is possible to transmit both upper and lower case text
It uses one character as a shift code to send numeric and special characters
E8D13: Which of the following is a typical value for the peak voltage at a standard U.S. household electrical outlet?
240 volts
170 volts
120 volts
340 volts
E9A03: Which of the following antennas has no gain in any direction?
Quarter-wave vertical
Yagi
Half-wave dipole
Isotropic antenna
E9B11: What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength?
Ground conductivity will not be accurately modeled
The resulting design will favor radiation of harmonic energy
The computed feed point impedance may be incorrect
The antenna will become mechanically unstable
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
E9D07: What is a disadvantage of using a multiband trapped antenna?
It might radiate harmonics
It radiates the harmonics and fundamental equally well
It is too sharply directional at lower frequencies
It must be neutralized
E9E13: What is the purpose of a Wilkinson divider?
It divides the operating frequency of a transmitter signal so it can be used on a lower frequency band
It is used to feed high-impedance antennas from a low-impedance source
It divides power equally among multiple loads while preventing changes in one load from disturbing power flow to the others
It is used to feed low-impedance loads from a high-impedance source
E9F04: What is the typical velocity factor for a coaxial cable with solid polyethylene dielectric?
2.70
0.66
0.30
0.10
E9G04: What are the two families of circles and arcs that make up a Smith chart?
Resistance and voltage
Reactance and voltage
Resistance and reactance
Voltage and impedance
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
