Amateur Extra Class Practice Test

Select the most correct answer for each question, then submit your practice test to check your score. This practice test randomly pulls one question from each topic in the Amateur Extra pool.

Good Luck!


Which of the following is a common use of a Schottky diode?

As a rectifier in high current power supplies
As a variable capacitance in an automatic frequency control circuit
As a constant voltage reference in a power supply
As a VHF/UHF mixer or detector


Which of the following types of amateur station communications are prohibited?

Communications transmitted for hire or material compensation, except as otherwise provided in the rules
Communications that have political content, except as allowed by the Fairness Doctrine
Communications that have religious content
Communications in a language other than English


Which of the following describes a receiving filter's ability to reject signals occupying an adjacent channel?

Passband ripple
Phase response
Shape factor
Noise factor


What is the primary purpose of phasing lines when used with an antenna having multiple driven elements?

It ensures that each driven element operates in concert with the others to create the desired antenna pattern
It prevents reflected power from traveling back down the feed line and causing harmonic radiation from the transmitter
It allows single-band antennas to operate on other bands
It creates a low-angle radiation pattern


What is the equivalent circuit of a quartz crystal?

Motional capacitance, motional inductance, and loss resistance in series, all in parallel with a shunt capacitor representing electrode and stray capacitance
Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in parallel
Motional capacitance, motional inductance, loss resistance, and a capacitor representing electrode and stray capacitance all in series
Motional inductance and loss resistance in series, paralleled with motional capacitance and a capacitor representing electrode and stray capacitance


What is one way a single-sideband phone signal can be generated?

By using a balanced modulator followed by a filter
By using a reactance modulator followed by a mixer
By using a loop modulator followed by a mixer
By driving a product detector with a DSB signal


What describes Orthogonal Frequency Division Multiplexing?

A frequency modulation technique that uses non-harmonically related frequencies
A bandwidth compression technique using Fourier transforms
A digital mode for narrow-band, slow-speed transmissions
A digital modulation technique using subcarriers at frequencies chosen to avoid intersymbol interference


Which of the following receiver circuits can be effective in eliminating interference from strong out-of-band signals?

A front-end filter or pre-selector
A narrow IF filter
A notch filter
A properly adjusted product detector


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


What is a Pennant antenna?

A four-element, high-gain vertical array invented by George Pennant
A small, vertically oriented receiving antenna consisting of a triangular loop terminated in approximately 900 ohms
A form of rhombic antenna terminated in a variable capacitor to provide frequency diversity
A stealth antenna built to look like a flagpole


In Figure E7-1, what is the purpose of R1 and R2?

Load resistors
Voltage divider bias
Self bias
Circuit Diagram


What must the VE team do if an examinee scores a passing grade on all examination elements needed for an upgrade or new license?

Photocopy all examination documents and forward them to the FCC for processing
Three VEs must certify that the examinee is qualified for the license grant and that they have complied with the administering VE requirements
Issue the examinee the new or upgrade license
All these choices are correct


What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?



Why is the physical length of a coaxial cable transmission line shorter than its electrical length?

Skin effect is less pronounced in the coaxial cable
The characteristic impedance is higher in a parallel feed line
The surge impedance is higher in a parallel feed line
Electrical signals move more slowly in a coaxial cable than in air


What is the half-power bandwidth of a resonant circuit that has a resonant frequency of 3.7 MHz and a Q of 118?

436.6 kHz
218.3 kHz
31.4 kHz
15.7 kHz


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


Which of the following data are used by the APRS network to communicate station location?

Polar coordinates
Time and frequency
Radio direction finding spectrum analysis
Latitude and longitude


What do the letters FEC mean as they relate to digital operation?

Forward Error Correction
First Error Correction
Fatal Error Correction
Final Error Correction


What is indicated by a rising A or K index?

Increasing disruption of the geomagnetic field
Decreasing disruption of the geomagnetic field
Higher levels of solar UV radiation
An increase in the critical frequency


What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?

An adaptive filter
A crystal-lattice filter
A Hilbert-transform filter
A phase-inverting filter


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


What is the main reason to use a charge controller with a solar power system?

Prevention of battery undercharge
Control of electrolyte levels during battery discharge
Prevention of battery damage due to overcharge
Matching of day and night charge rates


What is a Programmable Logic Device (PLD)?

A logic circuit that can be modified during use
A programmable collection of logic gates and circuits in a single integrated circuit
Programmable equipment used for testing digital logic integrated circuits
A type of transistor whose gain can be changed by digital logic circuits


How can unwanted ringing and audio instability be prevented in an op-amp RC audio filter circuit?

Restrict both gain and Q
Restrict gain but increase Q
Restrict Q but increase gain
Increase both gain and Q


Which of the following factors most affects the accuracy of a frequency counter?

Input attenuator accuracy
Time base accuracy
Decade divider accuracy
Temperature coefficient of the logic


What happens as the Q of an antenna increases?

SWR bandwidth increases
SWR bandwidth decreases
Gain is reduced
More common-mode current is present on the feed line


Which of the following represents an inductive reactance in polar coordinates?

A positive magnitude
A negative magnitude
A positive phase angle
A negative phase angle


Which describes an optical shaft encoder?

A device that detects rotation of a control by interrupting a light source with a patterned wheel
A device that measures the strength of a beam of light using analog to digital conversion
A digital encryption device often used to encrypt spacecraft control signals
A device for generating RTTY signals by means of a rotating light source


How is positive feedback supplied in a Pierce oscillator?

Through a tapped coil
Through link coupling
Through a neutralizing capacitor
Through a quartz crystal


What is one type of electrical interference that might be caused by a nearby personal computer?

A loud AC hum in the audio output of your station receiver
A clicking noise at intervals of a few seconds
The appearance of unstable modulated or unmodulated signals at specific frequencies
A whining type noise that continually pulses off and on


Which of the following amateur bands most frequently provides long-path propagation?

80 meters
20 meters
10 meters
6 meters


What is a disadvantage of decreasing the number of wire segments in an antenna model below 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


Which of the following amateur stations may transmit one-way communications?

A space station, beacon station, or telecommand station
A local repeater or linked repeater station
A message forwarding station or automatically controlled digital station
All these choices are correct


Where must the carrier frequency of a CW signal be set to comply with FCC rules for 60 meter operation?

At the lowest frequency of the channel
At the center frequency of the channel
At the highest frequency of the channel
On any frequency where the signal's sidebands are within the channel


Which of the following describes a Zepp antenna?

A dipole constructed from zip cord
An end-fed dipole antenna
An omni-directional antenna commonly used for satellite communications
A vertical array capable of quickly changing the direction of maximum radiation by changing phasing lines


What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historic Places?

A proposal must be submitted to the National Park Service
A letter of intent must be filed with the Environmental Protection Agency
An Environmental Assessment must be submitted to the FCC
A form FSD-15 must be submitted to the Department of the Interior


Why is it important to keep lead lengths short for components used in circuits for VHF and above?

To increase the thermal time constant
To avoid unwanted inductive reactance
To maintain component lifetime
All these choices are correct


What is the relationship between the AC current through an inductor and the voltage across an inductor?

Voltage leads current by 90 degrees
Current leads voltage by 90 degrees
Voltage and current are 180 degrees out of phase
Voltage and current are in phase


What is the bandwidth of a 170-hertz shift, 300-baud ASCII transmission?

0.1 Hz
0.3 kHz
0.5 kHz
1.0 kHz


Which of the following measures SWR?

A spectrum analyzer
A Q meter
An ohmmeter
An antenna analyzer


What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF carrier?

Frequency hopping
Direct sequence
Binary phase-shift keying
Phase compandored spread spectrum


What is vestigial sideband modulation?

Amplitude modulation in which one complete sideband and a portion of the other are transmitted
A type of modulation in which one sideband is inverted
Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation


What logical operation does a NAND gate perform?

It produces logic 0 at its output only when all inputs are logic 0
It produces logic 1 at its output only when all inputs are logic 1
It produces logic 0 at its output if some but not all inputs are logic 1
It produces logic 0 at its output only when all inputs are logic 1


What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?

500 miles, if the moon is at perigee
2000 miles, if the moon is at apogee
5000 miles, if the moon is at perigee
12,000 miles, if the moon is visible by both stations


What is the effective radiated power relative to a dipole of a repeater station with 150 watts transmitter power output, 2 dB feed line loss, 2.2 dB duplexer loss, and 7 dBd antenna gain?

1977 watts
78.7 watts
420 watts
286 watts


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


What is the name of the process that shows that a square wave is made up of a sine wave plus all its odd harmonics?

Fourier analysis
Vector analysis
Numerical analysis
Differential analysis


What type of satellite appears to stay in one position in the sky?



What is the primary function of an external earth connection or ground rod?

Reduce received noise
Lightning protection
Reduce RF current flow between pieces of equipment
Reduce RFI to telephones and home entertainment systems


How is power supplied to the most common type of 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