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 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?
What does the value of Bz (B sub Z) represent?
What determines the upper frequency limit for a computer soundcard-based oscilloscope program?
Which of the following digital modes is especially designed for use for meteor scatter signals?
What is a frequency discriminator stage in a FM receiver?
What is the maximum permitted transmitter peak envelope power for an amateur station transmitting spread spectrum communications?
Which of the following signals might a receiver noise blanker be able to remove from desired signals?
What third family of circles is often added to a Smith chart during the process of solving problems?
What is the radiation pattern of two 1/4-wavelength vertical antennas spaced 1/2-wavelength apart and fed 180 degrees out of phase?
Which of the following represents an inductive reactance in polar coordinates?
What is meant by antenna bandwidth?
What is an Earth station in the amateur satellite service?
What is the approximate bandwidth of a slow-scan TV signal?
How does an impedance-matching circuit transform a complex impedance to a resistive impedance?
What type of equipment is commonly used to implement a ham radio mesh network?
What is one way to predict the location of a satellite at a given time?
How does the total amount of radiation emitted by a directional gain antenna compare with the total amount of radiation emitted from an isotropic antenna, assuming each is driven by the same amount of power?
Which of these choices is an effective way to match an antenna with a 100 ohm feed point impedance to a 50 ohm coaxial cable feed line?
What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?
What impedance does a 1/4 wavelength transmission line present to a generator when the line is shorted at the far end?
Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?
Which of the following components can be used to reduce thermal drift in crystal oscillators?
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?
Which of the following would provide the best RF ground for your station?
What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?
How many flip-flops are required to divide a signal frequency by 4?
Which of the following best describes the Volunteer Examiner accreditation process?
What is a Programmable Logic Device (PLD)?
What is the purpose of the preselector in a communications receiver?
Which type of slug material decreases inductance when inserted into a coil?
What is the maximum bandwidth for a data emission on 60 meters?
In Figure E6-3, what is the schematic symbol for a light-emitting diode?
Which of these ranges of frequencies is available for an automatically controlled repeater operating below 30 MHz?
What is the function of a sense antenna?
What is the necessary bandwidth of a 4800-Hz frequency shift, 9600-baud ASCII FM transmission?
What are the majority charge carriers in N-type semiconductor material?
What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
Which of the following could account for hearing an echo on the received signal of a distant station?
What is one advantage of using ASCII code for data communications?
What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?
What is a solid state relay?
What is a Class D amplifier?
What is indicated when one of the ellipses in an FSK crossed-ellipse display suddenly disappears?
What happens to the phase angle of a reactance when it is converted to a susceptance?
Which of the following injuries can result from using high-power UHF or microwave transmitters?
What digital process is applied to I and Q signals in order to recover the baseband modulation information?
Which type of atmospheric structure can create a path for microwave propagation?
How does a narrow-band roofing filter affect receiver performance?
How can the true power be determined in an AC circuit where the voltage and current are out of phase?