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 describes frequency division multiplexing?
How does the beamwidth of an antenna vary as the gain is increased?
Which of the following parameters determines the bandwidth of a digital or computer-based oscilloscope?
What is the typical input impedance of an integrated circuit op-amp?
How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?
Which of the following can divide the frequency of a pulse train by 2?
Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?
What is the relationship between the current through an inductor and the voltage across an inductor?
What do the terms L band and S band specify with regard to satellite communications?
What is meant by automatic control of a station?
What special operating frequency restrictions are imposed on slow scan TV transmissions?
How is positive feedback supplied in a Pierce oscillator?
What is an effective way of matching a feed line to a VHF or UHF antenna when the impedances of both the antenna and feed line are unknown?
Which of the following constitutes a spurious emission?
Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?
What characteristic of a PIN diode makes it useful as an RF switch or attenuator?
What is the maximum bandwidth for a data emission on 60 meters?
What is the effect of intermodulation products in a linear power amplifier?
Where should a high Q loading coil be placed to minimize losses in a shortened vertical antenna?
Which of the following semiconductor materials contains excess free electrons?
What is the approximate open-circuit voltage produced by a fully-illuminated silicon photovoltaic cell?
Where are the questions for all written U.S. amateur license examinations listed?
What is the primary advantage of using a Programmable Gate Array (PGA) in a logic circuit?
What type of transmission is most often used for a ham radio mesh network?
What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?
What transmit frequency might generate an image response signal in a receiver tuned to 14.300 MHz and which uses a 455 kHz IF frequency?
What impedance does a 1/2 wavelength transmission line present to a generator when the line is open at the far end?
How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?
Which type of detector is used for demodulating SSB signals?
In the antenna radiation pattern shown in Figure E9-1, what is the front-to-back ratio?
Which of the following types of linear voltage regulator usually make the most efficient use of the primary power source?
If you plot the impedance of a circuit using the rectangular coordinate system and find the impedance point falls on the right side of the graph on the horizontal axis, what do you know about the circuit?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
What is the half-power bandwidth of a parallel resonant circuit that has a resonant frequency of 7.1 MHz and a Q of 150?
When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?
What is the effect of a terminating resistor on a rhombic antenna?
What type of chart is shown in Figure E9-3?
What is the most common method of reducing key clicks?
What do the letters FEC mean as they relate to digital operation?
Which of the following best describes electromagnetic waves traveling in free space?
Who may be the control operator of an auxiliary station?
What advantage does a Pi-L-network have over a regular Pi-network for impedance matching between the final amplifier of a vacuum-tube transmitter and an antenna?
What three test loads are used to calibrate a standard RF vector network analyzer?
Which is the most common input and output impedance of circuits that use MMICs?
What is one of the potential hazards of using microwaves in the amateur radio bands?
How can an APRS station be used to help support a public service communications activity?
What class of licensee is authorized to be the control operator of a space station?
Which of the following types of receiver noise can often be reduced with a DSP noise filter?
What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
What is one reason for using ferrite cores rather than powdered-iron in an inductor?