Current Ham Radio Test Pools
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.
What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency when the modulating frequency is 1000 Hz?
Which of the following factors most affects the accuracy of a frequency counter?
On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?
What is one type of electrical interference that might be caused by a nearby personal computer?
Which of the following describes an emitter follower (or common collector) amplifier?
By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?
Which VHF amateur bands have frequencies authorized for space stations?
Who is responsible for the proper conduct and necessary supervision during an amateur operator license examination session?
Which of these materials is most commonly used to create photoconductive devices?
What kind of digital signal processing audio filter is used to remove unwanted noise from a received SSB signal?
Which of the following component package types would be most suitable for use at frequencies above the HF range?
What is considered an acceptable maximum IMD level for an idling PSK signal?
What is the principle of a Method of Moments analysis?
Which of the following types of linear voltage regulator places a constant load on the unregulated voltage source?
What is the bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
What frequencies are authorized to an amateur station operating under RACES rules?
When evaluating RF exposure levels from your station at a neighbor's home, what must you do?
Where is the impedance of a pure resistance plotted on rectangular coordinates?
Which of the following geographic descriptions approximately describes "Line A"?
Which of the following HF digital modes uses variable-length coding for bandwidth efficiency?
How does ladder line compare to small-diameter coaxial cable such as RG-58 at 50 MHz?
A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?
Why are short connections used at microwave frequencies?
What is the term for the long path opening that exists between two points on the Earth which are simultaneously near sunrise and sunset?
Which of the following describes an Extended Double Zepp antenna?
What type of equipment is commonly used to implement an amateur radio mesh network?
Which of the following techniques is normally used by low Earth orbiting digital satellites to relay messages around the world?
Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
What is the term for spurious signals generated by the combination of two or more signals in a non-linear device or circuit?
If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?
What happens to the magnitude of a pure reactance when it is converted to a susceptance?
How does an impedance-matching circuit transform a complex impedance to a resistive impedance?
Which of the following is a type of analog-to-digital conversion?
What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?
Where should a high Q loading coil be placed to minimize losses in a shortened vertical antenna?
How can an APRS station be used to help support a public service communications activity?
What is the highest modulation index permitted at the highest modulation frequency for angle modulation below 29.0 MHz?
What is a characteristic of a monostable multivibrator?
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?
What core material property determines the inductance of an inductor?
What is the name of the signal component that carries color information in NTSC video?
Why is RF attenuation used when direction-finding?
How is positive feedback supplied in a Hartley oscillator?
Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
Which of the following is a common use of a Schottky diode?
What characterizes libration fading of an EME signal?
Which of the following increases Q for inductors and capacitors?
Which of the following semiconductor materials contains excess free electrons?
What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?
How does a diode envelope detector function?