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!


What type of bias is required for an LED to emit light?

Reverse bias
Forward bias
Zero bias
Inductive bias


What three test loads are used to calibrate a standard RF vector network analyzer?

50 ohms, 75 ohms, and 90 ohms
Short circuit, open circuit, and 50 ohms
Short circuit, open circuit, and resonant circuit
50 ohms through 1/8 wavelength, 1/4 wavelength, and 1/2 wavelength of coaxial cable


What is one advantage of using ASCII code for data communications?

It includes built in error correction features
It contains fewer information bits per character than any other code
It is possible to transmit both upper and lower case text
It uses one character as a shift code to send numeric and special characters


What is the best time of day for transequatorial propagation?

Afternoon or early evening
Late at night


What type of chart is shown in Figure E9-3?

Smith chart
Free space radiation directivity chart
Elevation angle radiation pattern chart
Azimuth angle radiation pattern chart
Circuit Diagram


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


Which of the following statements concerning remotely controlled amateur stations is true?

Only Extra Class operators may be the control operator of a remote station
A control operator need not be present at the control point
A control operator must be present at the control point
Repeater and auxiliary stations may not be remotely controlled


What is the name of the matching system that uses a section of transmission line connected in parallel with the feed line at or near the feed point?

The gamma match
The delta match
The omega match
The stub match


Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

Mountain ranges
Bodies of water
Urban areas


Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?

High speed digital modes
Extremely low-power contacts
OFDM signals are not allowed on amateur bands


Which of the following amplifier types reduces or eliminates even order harmonics?

Class C
Class AB


What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission?

15.36 kHz
9.6 kHz
4.8 kHz
5.76 kHz


What is the maximum permitted transmitter peak envelope power for an amateur station transmitting spread spectrum communications?

1 W
1.5 W
10 W
1.5 kW


Which of these methods is commonly used to convert analog signals to digital signals?

Sequential sampling
Harmonic regeneration
Level shifting
Phase reversal


What is the most common data rate used for HF packet?

48 baud
110 baud
300 baud
1200 baud


What does the MDS of a receiver represent?

The meter display sensitivity
The minimum discernible signal
The multiplex distortion stability
The maximum detectable spectrum


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 Historical Places?

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


What type of signal is picked up by electrical wiring near a radio antenna?

A common-mode signal at the frequency of the radio transmitter
An electrical-sparking signal
A differential-mode signal at the AC power line frequency
Harmonics of the AC power line frequency


What is a crystal lattice filter?

A power supply filter made with interlaced quartz crystals
An audio filter made with four quartz crystals that resonate at 1kHz intervals
A filter with wide bandwidth and shallow skirts made using quartz crystals
A filter with narrow bandwidth and steep skirts made using quartz crystals


What is the primary reason that a high-frequency switching type high voltage power supply can be both less expensive and lighter in weight than a conventional power supply?

The inverter design does not require any output filtering
It uses a diode bridge rectifier for increased output
The high frequency inverter design uses much smaller transformers and filter components for an equivalent power output
It uses a large power factor compensation capacitor to create free power from the unused portion of the AC cycle


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 of the following can cause receiver desensitization?

Audio gain adjusted too low
Strong adjacent channel signals
Audio bias adjusted too high
Squelch gain misadjusted


What letter is commonly used to represent susceptance?



Why are there separate electric (E) and magnetic (H) field MPE limits?

The body reacts to electromagnetic radiation from both the E and H fields
Ground reflections and scattering make the field impedance vary with location
E field and H field radiation intensity peaks can occur at different locations
All of these choices are correct


Which of the following is an aspect of the piezoelectric effect?

Mechanical deformation of material by the application of a voltage
Mechanical deformation of material by the application of a magnetic field
Generation of electrical energy in the presence of light
Increased conductivity in the presence of light


What is a disadvantage of using a multiband trapped antenna?

It might radiate harmonics
It radiates the harmonics and fundamental equally well
It is too sharply directional at lower frequencies
It must be neutralized


What does the value of Bz (B sub Z) represent?

Geomagnetic field stability
Critical frequency for vertical transmissions
Direction and strength of the interplanetary magnetic field
Duration of long-delayed echoes


What is meant by the term op-amp input offset voltage?

The output voltage of the op-amp minus its input voltage
The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
The differential input voltage needed to bring the open loop output voltage to zero
The potential between the amplifier input terminals of the op-amp in an open loop condition


In the antenna radiation pattern shown in Figure E9-1, what is the front-to-back ratio?

36 dB
18 dB
24 dB
14 dB
Circuit Diagram


What might help to restore contact when DX signals become too weak to copy across an entire HF band a few hours after sunset?

Switch to a higher frequency HF band
Switch to a lower frequency HF band
Wait 90 minutes or so for the signal degradation to pass
Wait 24 hours before attempting another communication on the band


What are the majority charge carriers in N-type semiconductor material?

Free electrons
Free protons
Free neutrons


Which of the following is good practice when using an oscilloscope probe?

Keep the signal ground connection of the probe as short as possible
Never use a high impedance probe to measure a low impedance circuit
Never use a DC-coupled probe to measure an AC circuit
All of these choices are correct


What 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


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

Ball grid array


How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?

200 watts
1000 watts
1600 watts
600 watts


What is a vector?

The value of a quantity that changes over time
A quantity with both magnitude and an angular component
The inverse of the tangent function
The inverse of the sine function


What is the direction of a descending pass for an amateur satellite?

From north to south
From west to east
From east to west
From south to north


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"


How can an oscillator's microphonic responses be reduced?

Use of NP0 capacitors
Eliminating noise on the oscillator's power supply
Using the oscillator only for CW and digital signals
Mechanically isolating the oscillator circuitry from its enclosure


How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?

3.85 dB
6.0 dB
8.15 dB
2.79 dB


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


To which of the following examinees may a VE not administer an examination?

Employees of the VE
Friends of the VE
Relatives of the VE as listed in the FCC rules
All of these choices are correct


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


Which of the following is a requirement of a space station?

The space station must be capable of terminating transmissions by telecommand when directed by the FCC
The space station must cease all transmissions after 5 years
The space station must be capable of changing its orbit whenever such a change is ordered by NASA
All of these choices are correct


With your transceiver displaying the carrier frequency of CW signals, you hear a DX station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same frequency?

Yes, the DX station initiated the contact
Yes, the displayed frequency is within the 80 meter CW band segment
No, one of the sidebands of the CW signal will be out of the band
No, U.S. stations are not permitted to use CW emissions below 3.525 MHz


How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?



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


Which of these materials is affected the most by photoconductivity?

A crystalline semiconductor
An ordinary metal
A heavy metal
A liquid semiconductor


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 is one advantage of using JT65 coding?

Uses only a 65 Hz bandwidth
The ability to decode signals which have a very low signal to noise ratio
Easily copied by ear if necessary
Permits fast-scan TV transmissions over narrow bandwidth