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!


E9B11:

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

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

E2B05:

Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?

The vestigial sideband carries the audio information
The vestigial sideband contains chroma information
Vestigial sideband reduces bandwidth while allowing for simple video detector circuitry
Vestigial sideband provides high frequency emphasis to sharpen the picture

E3B11:

At what time of day can sporadic E propagation occur?

Only around sunset
Only around sunset and sunrise
Only in hours of darkness
Any time

E7G06:

What is the gain-bandwidth of an operational amplifier?

The maximum frequency for a filter circuit using that type of amplifier
The frequency at which the open-loop gain of the amplifier equals one
The gain of the amplifier at a filter's cutoff frequency
The frequency at which the amplifier's offset voltage is zero

E8A02:

Which of the following is a type of analog-to-digital conversion?

Successive approximation
Harmonic regeneration
Level shifting
Phase reversal

E9F10:

What impedance does a 1/8-wavelength transmission line present to a generator when the line is shorted at the far end?

A capacitive reactance
The same as the characteristic impedance of the line
An inductive reactance
Zero

E3C11:

What does VOACAP software model?

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

E4E11:

What could cause local AM broadcast band signals to combine to generate spurious signals in the MF or HF bands?

One or more of the broadcast stations is transmitting an over-modulated signal
Nearby corroded metal joints are mixing and re-radiating the broadcast signals
You are receiving skywave signals from a distant station
Your station receiver IF amplifier stage is defective

E6D06:

What core material property determines the inductance of an inductor?

Thermal impedance
Resistance
Reactivity
Permeability

E9C12:

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

E5A16:

What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries and C is 10 picofarads?

23.5 MHz
23.5 kHz
7.12 kHz
7.12 MHz

E9G10:

What do the arcs on a Smith chart represent?

Frequency
SWR
Points with constant resistance
Points with constant reactance

E6C04:

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

E8B02:

How does the modulation index of a phase-modulated emission vary with RF carrier frequency?

It increases as the RF carrier frequency increases
It decreases as the RF carrier frequency increases
It varies with the square root of the RF carrier frequency
It does not depend on the RF carrier frequency

E3A04:

What do Hepburn maps predict?

Sporadic E propagation
Locations of auroral reflecting zones
Likelihood of rain scatter along cold or warm fronts
Probability of tropospheric propagation

E0A01:

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

E6B04:

What type of semiconductor device is designed for use as a voltage-controlled capacitor?

Varactor diode
Tunnel diode
Silicon-controlled rectifier
Zener diode

E5B03:

How is impedance in polar form converted to an equivalent admittance?

Take the reciprocal of the angle and change the sign of the magnitude
Take the reciprocal of the magnitude and change the sign of the angle
Take the square root of the magnitude and add 180 degrees to the angle
Square the magnitude and subtract 90 degrees from the angle

E7D07:

What is the purpose of C2 in the circuit shown in Figure E7-2?

It bypasses rectifier output ripple around D1
It is a brute force filter for the output
To self-resonate at the hum frequency
To provide fixed DC bias for Q1
Circuit Diagram

E1F06:

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

E9D07:

What is an advantage of using top loading in a shortened HF vertical antenna?

Lower Q
Greater structural strength
Higher losses
Improved radiation efficiency

E7F12:

Which of the following is an advantage of a Finite Impulse Response (FIR) filter vs an Infinite Impulse Response (IIR) digital filter?

FIR filters can delay all frequency components of the signal by the same amount
FIR filters are easier to implement for a given set of passband rolloff requirements
FIR filters can respond faster to impulses
All these choices are correct

E9E11:

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

E9A06:

What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?

317 watts
2000 watts
126 watts
300 watts

E9H04:

What is an advantage of placing a grounded electrostatic shield around a small loop direction-finding antenna?

It adds capacitive loading, increasing the bandwidth of the antenna
It eliminates unbalanced capacitive coupling to the surroundings, improving the nulls
It eliminates tracking errors caused by strong out-of-band signals
It increases signal strength by providing a better match to the feed line

E5D06:

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

E6F01:

What absorbs the energy from light falling on a photovoltaic cell?

Protons
Photons
Electrons
Holes

E1C13:

What notifications must be given before transmitting on the 630 meter or 2200 meter bands?

A special endorsement must be requested from the FCC
An environmental impact statement must be filed with the Department of the Interior
Operators must inform the Utilities Telecom Council of their call sign and coordinates of the station
Operators must inform the FAA of their intent to operate, giving their call sign and distance to the nearest runway

E4D10:

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 input signals will theoretically generate a third-order intermodulation product that has the same output amplitude as either of the input signals
A pair of 1 mW input signals will produce a third-order intermodulation product that is 40 dB stronger than the input signal

E1D12:

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

E1B03:

Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?

1 mile
3 miles
10 miles
30 miles

E5C01:

Which of the following represents capacitive reactance in rectangular notation?

-jX
+jX
Delta
Omega

E2C04:

Which of the following frequencies are sometimes used for amateur radio mesh networks?

HF frequencies where digital communications are permitted
Frequencies shared with various unlicensed wireless data services
Cable TV channels 41 through 43
The 60 meter band channel centered on 5373 kHz

E7E09:

What occurs when an excessive amount of signal energy reaches a mixer circuit?

Spurious mixer products are generated
Mixer blanking occurs
Automatic limiting occurs
A beat frequency is generated

E7B15:

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

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

E7H10:

What information is contained in the lookup table of a direct digital synthesizer (DDS)?

The phase relationship between a reference oscillator and the output waveform
Amplitude values that represent the desired waveform
The phase relationship between a voltage-controlled oscillator and the output waveform
Frequently used receiver and transmitter frequencies

E6E02:

Which of the following device packages is a through-hole type?

DIP
PLCC
Ball grid array
SOT

E1A05:

What is the maximum power output permitted on the 60 meter band?

50 watts PEP effective radiated power relative to an isotropic radiator
50 watts PEP effective radiated power relative to a dipole
100 watts PEP effective radiated power relative to the gain of a half-wave dipole
100 watts PEP effective radiated power relative to an isotropic radiator

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 these choices are correct

E7A05:

Which of the following is a circuit that continuously alternates between two states without an external clock?

Monostable multivibrator
J-K flip-flop
T flip-flop
Astable multivibrator

E4B06:

How much power is being absorbed by the load when a directional power meter connected between a transmitter and a terminating load reads 100 watts forward power and 25 watts reflected power?

100 watts
125 watts
25 watts
75 watts

E4C10:

What is an advantage of having a variety of receiver IF bandwidths from which to select?

The noise figure of the RF amplifier can be adjusted to match the modulation type, thus increasing receiver sensitivity
Receiver power consumption can be reduced when wider bandwidth is not required
Receive bandwidth can be set to match the modulation bandwidth, maximizing signal-to-noise ratio and minimizing interference
Multiple frequencies can be received simultaneously if desired

E2E02:

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

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

E7C05:

Which filter type is described as having ripple in the passband and a sharp cutoff?

A Butterworth filter
An active LC filter
A passive op-amp filter
A Chebyshev filter

E8C08:

How does ARQ accomplish error correction?

Special binary codes provide automatic correction
Special polynomial codes provide automatic correction
If errors are detected, redundant data is substituted
If errors are detected, a retransmission is requested

E1E02:

Who does Part 97 task with maintaining the pools of questions for all U.S. amateur license examinations?

The VEs
The FCC
The VECs
The ARRL

E8D02:

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

E2D06:

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

E2A03:

How is the signal inverted by an inverting linear transponder?

The signal is detected and remodulated on the reverse sideband
The signal is passed through a non-linear filter
The signal is reduced to I and Q components and the Q component is filtered out
The signal is passed through a mixer and the difference rather than the sum is transmitted