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 required in order to operate in accordance with CEPT rules in foreign countries where permitted?

You must identify in the official language of the country in which you are operating
The U.S. embassy must approve of your operation
You must bring a copy of FCC Public Notice DA 16-1048
You must append "/CEPT" to your call sign


How is Forward Error Correction implemented?

By the receiving station repeating each block of three data characters
By transmitting a special algorithm to the receiving station along with the data characters
By transmitting extra data that may be used to detect and correct transmission errors
By varying the frequency shift of the transmitted signal according to a predefined algorithm


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


Which of the following digital modes is designed for meteor scatter communications?



What is the advantage of including parity bits in ASCII characters?

Faster transmission rate
The signal can overpower interfering signals
Foreign language characters can be sent
Some types of errors can be detected


What is an operational amplifier?

A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance
A digital audio amplifier whose characteristics are determined by components external to the amplifier
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
A RF amplifier used in the UHF and microwave regions


Which materials are commonly used as a core in an inductor?

Polystyrene and polyethylene
Ferrite and brass
Teflon and Delrin
Cobalt and aluminum


Which of these emission modes is best for auroral propagation?



Which of the following is an advantage of BiCMOS logic?

Its simplicity results in much less expensive devices than standard CMOS
It is immune to electrostatic damage
It has the high input impedance of CMOS and the low output impedance of bipolar transistors
All these choices are correct


What is one of the potential hazards of operating in the amateur radio microwave 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


What is the function of a sense antenna?

It modifies the pattern of a DF antenna array to provide a null in one direction
It increases the sensitivity of a DF antenna array
It allows DF antennas to receive signals at different vertical angles
It provides diversity reception that cancels multipath signals


What type of computer program technique is commonly used for modeling antennas?

Graphical analysis
Method of Moments
Mutual impedance analysis
Calculus differentiation with respect to physical properties


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 factors has the greatest effect on the bandwidth and response shape of a crystal ladder filter?

The relative frequencies of the individual crystals
The DC voltage applied to the quartz crystal
The gain of the RF stage preceding the filter
The amplitude of the signals passing through the filter


What is the purpose of a low-pass filter used in conjunction with a digital-to-analog converter?

Lower the input bandwidth to increase the effective resolution
Improve accuracy by removing out-of-sequence codes from the input
Remove harmonics from the output caused by the discrete analog levels generated
All these choices are correct


What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?

The amateur station must cease operation
The amateur station must cease operation on all frequencies below 30 MHz
The amateur station must cease operation on all frequencies above 30 MHz
The amateur station must avoid transmitting during certain hours on frequencies that cause the interference


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 to the conductivity of a photoconductive material when light shines on it?

It increases
It decreases
It stays the same
It becomes unstable


Why does a PN-junction diode not conduct current when reverse biased?

Only P-type semiconductor material can conduct current
Only N-type semiconductor material can conduct current
Holes in P-type material and electrons in the N-type material are separated by the applied voltage, widening the depletion region
Excess holes in P-type material combine with the electrons in N-type material, converting the entire diode into an insulator


Which of the following improves the efficiency of a ground-mounted quarter-wave vertical antenna?

Installing a radial system
Isolating the coax shield from ground
Shortening the radiating element
All these choices are correct


How is the Q of an RLC parallel resonant circuit calculated?

Reactance of either the inductance or capacitance divided by the resistance
Reactance of either the inductance or capacitance multiplied by the resistance
Resistance divided by the reactance of either the inductance or capacitance
Reactance of the inductance multiplied by the reactance of the capacitance


What is one way to prevent thermal runaway in a bipolar transistor amplifier?

Select transistors with high beta
Use a resistor in series with the emitter
All these choices are correct


Which circuit is bistable?

An AND gate
An OR gate
A flip-flop
A bipolar amplifier


Why is de-emphasis commonly used in FM communications receivers?

For compatibility with transmitters using phase modulation
To reduce impulse noise reception
For higher efficiency
To remove third-order distortion products


Why does the radio-path horizon distance exceed the geometric horizon?

E-region skip
D-region skip
Due to the Doppler effect
Downward bending due to density variations in the atmosphere


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


What is the purpose of the prescaler function on a frequency counter?

It amplifies low-level signals for more accurate counting
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


What is meant by the blocking dynamic range of a receiver?

The difference in dB between the noise floor and the level of an incoming signal that will cause 1 dB of gain compression
The minimum difference in dB between the levels of two FM signals that will cause one signal to block the other
The difference in dB between the noise floor and the third-order intercept point
The minimum difference in dB between two signals which produce third-order intermodulation products greater than the noise floor


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


How can linearly polarized Yagi antennas be used to produce circular polarization?

Stack two Yagis fed 90 degrees out of phase to form an array with the respective elements in parallel planes
Stack two Yagis fed in phase to form an array with the respective elements in parallel planes
Arrange two Yagis perpendicular to each other with the driven elements at the same point on the boom fed 90 degrees out of phase
Arrange two Yagis collinear to each other with the driven elements fed 180 degrees out of phase


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?



What is the noise figure of a receiver?

The ratio of atmospheric noise to phase noise
The ratio of the noise bandwidth in hertz to the theoretical bandwidth of a resistive network
The ratio of thermal noise to atmospheric noise
The ratio in dB of the noise generated by the receiver to the theoretical minimum noise


What is the purpose of digital store-and-forward functions on an amateur radio satellite?

To upload operational software for the transponder
To delay download of telemetry between satellites
To store digital messages in the satellite for later download by other stations
To relay messages between satellites


What is an important characteristic of a Schottky diode as compared to an ordinary silicon diode when used as a power supply rectifier?

Much higher reverse voltage breakdown
More constant reverse avalanche voltage
Longer carrier retention time
Less forward voltage drop


What is transequatorial propagation?

Propagation between two mid-latitude points at approximately the same distance north and south of the magnetic equator
Propagation between points located on the magnetic equator
Propagation between a point on the equator and its antipodal point
Propagation between points at the same latitude


What aspect of an analog slow-scan television signal encodes the brightness of the picture?

Tone frequency
Tone amplitude
Sync amplitude
Sync frequency


Which of the following types of linear voltage regulator usually make the most efficient use of the primary power source?

A series current source
A series regulator
A shunt regulator
A shunt current source


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)


Which of the following describes an Extended Double Zepp antenna?

A wideband vertical antenna constructed from precisely tapered aluminum tubing
A portable antenna erected using two push support poles
A center-fed 1.25-wavelength antenna (two 5/8-wave elements in phase)
An end-fed folded dipole antenna


What is the time constant of a circuit having two 220 microfarad capacitors and two 1 megohm resistors, all in parallel?

55 seconds
110 seconds
440 seconds
220 seconds


What is the function of a DX QSL Manager?

To allocate frequencies for DXpeditions
To handle the receiving and sending of confirmation cards for a DX station
To run a net to allow many stations to contact a rare DX station
To relay calls to and from a DX station


Which of the following components can be used to reduce thermal drift in crystal oscillators?

NP0 capacitors
Toroidal inductors
Wirewound resistors
Non-inductive resistors


What is a common method of generating an SSB signal using digital signal processing?

Mixing products are converted to voltages and subtracted by adder circuits
A frequency synthesizer removes the unwanted sidebands
Varying quartz crystal characteristics emulated in digital form
Signals are combined in quadrature phase relationship


Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?

440 MHz - 450 MHz
53 MHz - 54 MHz
222 MHz - 223 MHz
420 MHz - 430 MHz


On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?

Prime axis
Reactance axis
Impedance axis
Polar axis
Circuit Diagram


What is the difference between direct FSK and audio FSK?

Direct FSK applies the data signal to the transmitter VFO, while AFSK transmits tones via phone
Direct FSK occupies less bandwidth
Direct FSK can transmit faster baud rates
Only direct FSK can be decoded by computer


Which of the following is required in the identification transmissions from a balloon-borne telemetry station?

Call sign
The output power of the balloon transmitter
The station's six-character Maidenhead grid locator
All these choices are correct


In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?

In the same direction as the current
In a direction opposite to the current
In all directions; omni-directional
In a circle around the conductor


What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?

Warn the candidate that continued failure to comply will result in termination of the examination
Immediately terminate the candidate's examination
Allow the candidate to complete the examination, but invalidate the results
Immediately terminate everyone's examination and close the session


Which point on Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and a 19-picofarad capacitor at 21.200 MHz?

Point 1
Point 3
Point 7
Point 8
Circuit Diagram