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!


When using a transceiver that displays the carrier frequency of phone signals, which of the following displayed frequencies represents the highest frequency at which a properly adjusted USB emission will be totally within the band?

The exact upper band edge
300 Hz below the upper band edge
1 kHz below the upper band edge
3 kHz below the upper band edge


Which of the following oscillator circuits are commonly used in VFOs?

Pierce and Zener
Colpitts and Hartley
Armstrong and deForest
Negative feedback and balanced feedback


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 wave meter
By measuring the heating effect in a known resistor


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


Which of the following is a common use of a hot-carrier diode?

As balanced mixers in FM generation
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


What happens to the magnitude of a reactance when it is converted to a susceptance?

It is unchanged
The sign is reversed
It is shifted by 90 degrees
The magnitude of the susceptance is the reciprocal of the magnitude of the reactance


What is the term for the blocking of one FM phone signal by another, stronger FM phone signal?

Cross-modulation interference
Capture effect
Frequency discrimination


How does the gain of an ideal parabolic dish antenna change when the operating frequency is doubled?

Gain does not change
Gain is multiplied by 0.707
Gain increases by 6 dB
Gain increases by 3 dB


What does the abbreviation NEC stand for when applied to antenna modeling programs?

Next Element Comparison
Numerical Electromagnetic Code
National Electrical Code
Numeric Electrical Computation


Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor, a 0.64-microhenry inductor and an 85-picofarad capacitor at 24.900 MHz?

Point 1
Point 3
Point 5
Point 8
Circuit Diagram


What is a characteristic of DIP packaging used for integrated circuits?

Package mounts in a direct inverted position
Low leakage doubly insulated package
Two chips in each package (Dual In Package)
A total of two rows of connecting pins placed on opposite sides of the package (Dual In-line Package)


What is the magnitude of the current at the input of a series RLC circuit as the frequency goes through resonance?



What kind of filter would you use to attenuate an interfering carrier signal while receiving an SSB transmission?

A band-pass filter
A notch filter
A Pi-network filter
An all-pass filter


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?



What signals SSTV receiving equipment to begin a new picture line?

Specific tone frequencies
Elapsed time
Specific tone amplitudes
A two-tone signal


What is the primary effect of extremely short rise or fall time on a CW signal?

More difficult to copy
The generation of RF harmonics
The generation of key clicks
Limits data speed


What impedance does a 1/2 wavelength transmission line present to a generator when the line is shorted 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


Which is the name of a digital code where each preceding or following character changes by only one bit?

Binary Coded Decimal Code
Extended Binary Coded Decimal Interchange Code
Excess 3 code
Gray code


What is a solid state relay?

A relay using transistors to drive the relay coil
A device that uses semiconductors to implement the functions of an electromechanical relay
A mechanical relay that latches in the on or off state each time it is pulsed
A passive delay line


What is one disadvantage of using some types of automatic DSP notch-filters when attempting to copy CW signals?

A DSP filter can remove the desired signal at the same time as it removes interfering signals
Any nearby signal passing through the DSP system will overwhelm the desired signal
Received CW signals will appear to be modulated at the DSP clock frequency
Ringing in the DSP filter will completely remove the spaces between the CW characters


Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?

Zinc oxide
Beryllium Oxide
Uranium Hexafluoride


What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?

The lobes become more perpendicular to the wire
The lobes align more in the direction of the wire
The vertical angle increases
The front-to-back ratio decreases


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 describes a method of establishing EME contacts?

Time synchronous transmissions alternately from each station
Storing and forwarding digital messages
Judging optimum transmission times by monitoring beacons reflected from the Moon
High speed CW identification to avoid fading


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 is saturated
The receiver has drifted 5 kHz from the desired receive frequency
The mark and space signal have been inverted


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


Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?

Larger bypass capacitors are used in CMOS circuit design
The input switching threshold is about two times the power supply voltage
The input switching threshold is about one-half the power supply voltage
Input signals are stronger


Which of the following can divide the frequency of a pulse train by 2?

An XOR gate
A flip-flop
An OR gate
A multiplexer


What is the orbital period of an Earth satellite?

The point of maximum height of a satellite's orbit
The point of minimum height of a satellite's orbit
The time it takes for a satellite to complete one revolution around the Earth
The time it takes for a satellite to travel from perigee to apogee


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


How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?

At half the rate of the highest frequency component of the signal
At twice the rate of the highest frequency component of the signal
At the same rate as the highest frequency component of the signal
At four times the rate of the highest frequency component of the signal


What device is typically used as a stable reference voltage in a linear voltage regulator?

A Zener diode
A tunnel diode
A varactor diode


What is the function of a reactance modulator?

To produce PM signals by using an electrically variable resistance
To produce AM signals by using an electrically variable inductance or capacitance
To produce AM signals by using an electrically variable resistance
To produce PM signals by using an electrically variable inductance or capacitance


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

80 meters
20 meters
10 meters
6 meters


What type of energy is stored in an electromagnetic or electrostatic field?

Electromechanical energy
Potential energy
Thermodynamic energy
Kinetic energy


What is the purpose of the series capacitor in a gamma-type antenna matching network?

To provide DC isolation between the feed line and the antenna
To cancel the inductive reactance of the matching network
To provide a rejection notch that prevents the radiation of harmonics
To transform the antenna impedance to a higher value


How can unwanted ringing and audio instability be prevented in a multi-section 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


Why are switching amplifiers more efficient than linear amplifiers?

Switching amplifiers operate at higher voltages
The power transistor is at saturation or cut off most of the time, resulting in low power dissipation
Linear amplifiers have high gain resulting in higher harmonic content
Switching amplifiers use push-pull circuits


What must the VE team do with the application form if the examinee does not pass the exam?

Return the application document to the examinee
Maintain the application form with the VEC's records
Send the application form to the FCC and inform the FCC of the grade
Destroy the application form


What is the triangulation method of direction finding?

The geometric angles of sky waves from the source are used to determine its position
A fixed receiving station plots three headings to the signal source
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


What core material property determines the inductance of a toroidal inductor?

Thermal impedance


Which of these ranges of frequencies is available for an automatically controlled repeater operating below 30 MHz?

18.110 MHz - 18.168 MHz
24.940 MHz - 24.990 MHz
10.100 MHz - 10.150 MHz
29.500 MHz - 29.700 MHz


Which of the following frequency range is most suited for meteor scatter communications?

1.8 MHz - 1.9 MHz
10 MHz - 14 MHz
28 MHz - 148 MHz
220 MHz - 450 MHz


Why do many MOSFET devices have internally connected Zener diodes on the gates?

To provide a voltage reference for the correct amount of reverse-bias gate voltage
To protect the substrate from excessive voltages
To keep the gate voltage within specifications and prevent the device from overheating
To reduce the chance of the gate insulation being punctured by static discharges or excessive voltages


What does VOACAP software model?

AC voltage and impedance
VHF radio propagation
HF propagation
AC current and impedance


How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 12 dB gain over an isotropic antenna?

6.17 dB
9.85 dB
12.5 dB
14.15 dB


What does a third-order intercept level of 40 dBm mean with respect to receiver performance?

Signals less than 40 dBm will not generate audible third-order intermodulation products
The receiver can tolerate signals up to 40 dB above the noise floor without producing third-order intermodulation products
A pair of 40 dBm signals will theoretically generate a third-order intermodulation product with the same level as the input signals
A pair of 1 mW input signals will produce a third-order intermodulation product which is 40 dB stronger than the input signal


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


What is the effect of aliasing in a digital or computer-based oscilloscope?

False signals are displayed
All signals will have a DC offset
Calibration of the vertical scale is no longer valid
False triggering occurs


What third family of circles is often added to a Smith chart during the process of solving problems?

Standing wave ratio circles
Antenna-length circles
Coaxial-length circles
Radiation-pattern circles