Ham Extra License Practice Quiz
• Percentage: 0%; Correct: 0; Total: 0 of 50
E0A05: What is one of the potential hazards of using microwaves in the amateur radio bands?
Microwaves are ionizing radiation
The high gain antennas commonly used can result in high exposure levels
Microwaves often travel long distances by ionospheric reflection
The extremely high frequency energy can damage the joints of antenna structures
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
E1B12: What is the highest modulation index permitted at the highest modulation frequency for angle modulation?
.5
1.0
2.0
3.0
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
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
E1E13: What are the consequences of failing to appear for re-administration of an examination when so directed by the FCC?
The licensee's license will be cancelled
The person may be fined or imprisoned
The licensee is disqualified from any future examination for an amateur operator license grant
All these choices are correct
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
E2A09: What do the terms L band and S band specify with regard to satellite communications?
The 23 centimeter and 13 centimeter bands
The 2 meter and 70 centimeter bands
FM and Digital Store-and-Forward systems
Which sideband to use
E2B17: What is the approximate bandwidth of a slow-scan TV signal?
600 Hz
3 kHz
2 MHz
6 MHz
E2C08: Why are received spread-spectrum signals resistant to interference?
Signals not using the spectrum-spreading algorithm are suppressed in the receiver
The high power used by a spread-spectrum transmitter keeps its signal from being easily overpowered
The receiver is always equipped with a digital blanker circuit
If interference is detected by the receiver it will signal the transmitter to change frequencies
E2D06: Which of the following is a commonly used 2-meter APRS frequency?
144.39 MHz
144.20 MHz
145.02 MHz
146.52 MHz
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
E3B03: What is the best time of day for transequatorial propagation?
Morning
Noon
Afternoon or early evening
Late at night
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
E4A03: Which of the following parameters would a spectrum analyzer display on the vertical axis?
Amplitude
Duration
SWR
Q
E4B14: What happens if a dip meter is too tightly coupled to a tuned circuit being checked?
Harmonics are generated
A less accurate reading results
Cross modulation occurs
Intermodulation distortion occurs
E4C09: Which of the following choices is a good reason for selecting a high frequency for the design of the IF in a conventional HF or VHF communications receiver?
Fewer components in the receiver
Reduced drift
Easier for front-end circuitry to eliminate image responses
Improved receiver noise figure
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
E4E07: How can you determine if line noise interference is being generated within your home?
By checking the power line voltage with a time domain reflectometer
By observing the AC power line waveform with an oscilloscope
By turning off the AC power line main circuit breaker and listening on a battery operated radio
By observing the AC power line voltage with a spectrum analyzer
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
E5B01: What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage?
An exponential rate of one
One time constant
One exponential period
A time factor of one
E5C19: Which point on Figure E5-2 best represents that impedance of a series circuit consisting of a 400 ohm resistor and a 38 picofarad capacitor at 14 MHz?
Point 2
Point 4
Point 5
Point 6
E5D07: What determines the strength of a magnetic field around a conductor?
The resistance divided by the current
The ratio of the current to the resistance
The diameter of the conductor
The amount of current
E6A07: In Figure E6-1, what is the schematic symbol for a PNP transistor?
1
2
4
5
E6B09: What is a common use for point contact diodes?
As a constant current source
As a constant voltage source
As an RF detector
As a high voltage rectifier
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
E6D01: What is cathode ray tube (CRT) persistence?
The time it takes for an image to appear after the electron beam is turned on
The relative brightness of the display under varying conditions of ambient light
The ability of the display to remain in focus under varying conditions
The length of time the image remains on the screen after the beam is turned off
E6E08: How is power-supply voltage normally furnished to the most common type of monolithic microwave integrated circuit (MMIC)?
Through a resistor and/or RF choke connected to the amplifier output lead
MMICs require no operating bias
Through a capacitor and RF choke connected to the amplifier input lead
Directly to the bias-voltage (VCC IN) lead
E6F06: Which of these materials is affected the most by photoconductivity?
A crystalline semiconductor
An ordinary metal
A heavy metal
A liquid semiconductor
E7A01: Which of the following is a bistable circuit?
An "AND" gate
An "OR" gate
A flip-flop
A clock
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
E7C02: A T-network with series capacitors and a parallel shunt inductor has which of the following properties?
It is a low-pass filter
It is a band-pass filter
It is a high-pass filter
It is a notch filter
E7D09: What is the purpose of C1 in the circuit shown in Figure E7-3?
It resonates at the ripple frequency
It provides fixed bias for Q1
It decouples the output
It filters the supply voltage
E7E08: What are the principal frequencies that appear at the output of a mixer circuit?
Two and four times the original frequency
The sum, difference and square root of the input frequencies
The two input frequencies along with their sum and difference frequencies
1.414 and 0.707 times the input frequency
E7F01: What is the purpose of a prescaler circuit?
It converts the output of a JK flip flop to that of an RS flip-flop
It multiplies a higher frequency signal so a low-frequency counter can display the operating frequency
It prevents oscillation in a low-frequency counter circuit
It divides a higher frequency signal so a low-frequency counter can display the input frequency
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
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
E8A12: What type of information can be conveyed using digital waveforms?
Human speech
Video signals
Data
All of these choices are correct
E8B06: What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?
2.14
0.214
0.47
47
E8C06: What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
0.1 Hz
0.3 kHz
0.5 kHz
1.0 kHz
E8D08: Which of the following best describes electromagnetic waves traveling in free space?
Electric and magnetic fields become aligned as they travel
The energy propagates through a medium with a high refractive index
The waves are reflected by the ionosphere and return to their source
Changing electric and magnetic fields propagate the energy
E9A09: What is meant by antenna bandwidth?
Antenna length divided by the number of elements
The frequency range over which an antenna satisfies a performance requirement
The angle between the half-power radiation points
The angle formed between two imaginary lines drawn through the element ends
E9B01: In the antenna radiation pattern shown in Figure E9-1, what is the 3-dB beamwidth?
75 degrees
50 degrees
25 degrees
30 degrees
E9C06: What is the effect of a terminating resistor on a rhombic antenna?
It reflects the standing waves on the antenna elements back to the transmitter
It changes the radiation pattern from bidirectional to unidirectional
It changes the radiation pattern from horizontal to vertical polarization
It decreases the ground loss
E9D08: What happens to the bandwidth of an antenna as it is shortened through the use of loading coils?
It is increased
It is decreased
No change occurs
It becomes flat
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
E9G10: What do the arcs on a Smith chart represent?
Frequency
SWR
Points with constant resistance
Points with constant reactance
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
