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.
Which of the following injuries can result from using high-power UHF or microwave transmitters?
What type of coordinate system is used in a Smith chart?
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?
Which of the following oscillator circuits are commonly used in VFOs?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
What sets the minimum detectable signal level for an SDR in the absence of atmospheric or thermal noise?
Why might a DX station state that they are listening on another frequency?
Why do CMOS digital integrated circuits have high immunity to noise on the input signal or power supply?
Which of the following is a common use of a hot-carrier diode?
What happens to the conductivity of a photoconductive material when light shines on it?
Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?
What happens if a dip meter is too tightly coupled to a tuned circuit being checked?
Which materials are commonly used as a slug core in a variable inductor?
When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?
Which amateur band requires transmission on specific channels rather than on a range of frequencies?
How does ARQ accomplish error correction?
Which of the following is a circuit that continuously alternates between two states without an external clock?
How is the Q of an RLC parallel resonant circuit calculated?
What is the maximum permitted transmitter peak envelope power for an amateur station transmitting spread spectrum communications?
How does JT65 improve EME communications?
What is meant by automatic control of a station?
What impedance does a 1/8 wavelength transmission line present to a generator when the line is shorted at the far end?
Which type of digital mode does not support keyboard-to-keyboard operation?
How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?
How does a diode detector function?
Which of the following choices is a good reason for selecting a high frequency for the design of the IF in a conventional HF or VHF communications receiver?
Which of the following describes how the loading and tuning capacitors are to be adjusted when tuning a vacuum tube RF power amplifier that employs a Pi-network output circuit?
Which of the following is a requirement of a space station?
What is a crystal lattice filter?
What is the National Radio Quiet Zone?
On which of the following frequencies is one likely to find FM ATV transmissions?
What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?
What is meant by deviation ratio?
What is the name of the diagram used to show the phase relationship between impedances at a given frequency?
What is the primary purpose of a phasing line when used with an antenna having multiple driven elements?
What is one advantage of using ASCII code for data communications?
What is the purpose of the preselector in a communications receiver?
What is the effect of aliasing in a digital or computer-based oscilloscope?
Which of these choices is an acceptable method for monitoring the applicants if a VEC opts to conduct an exam session remotely?
What type of satellite appears to stay in one position in the sky?
What might be the cause of a loud roaring or buzzing AC line interference that comes and goes at intervals?
What might a sudden rise in radio background noise indicate?
What is a depletion-mode FET?
In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?
What is meant by antenna bandwidth?
What is reactive power?
What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the applied voltage?
What is the radiation pattern of two 1/4 wavelength vertical antennas spaced a 1/2 wavelength apart and fed in phase?
What happens as the Q of an antenna increases?
Which of the following is required for microwave propagation via rain scatter?