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 difference between direct FSK and audio FSK?
Which of the following amateur stations may transmit one-way communications?
Which is the most common input and output impedance of circuits that use MMICs?
Which of the following methods measures intermodulation distortion in an SSB transmitter?
Which point in Figure E5-1 best represents the impedance of a series circuit consisting of a 300-ohm resistor and an 18-microhenry inductor at 3.505 MHz?
Why is it important to keep lead lengths short for components used in circuits for VHF and above?
What is the purpose of the series capacitor in a gamma-type antenna matching network?
Which of these functions can be performed by a phase-locked loop?
What is the National Radio Quiet Zone?
Which describes a Pi-L-network used for matching a vacuum tube final amplifier to a 50-ohm unbalanced output?
Why can an attenuator be used to reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?
What toxic material may be present in some electronic components such as high voltage capacitors and transformers?
What happens to the conductivity of a photoconductive material when light shines on it?
Which of the following descriptors indicates the greatest solar flare intensity?
In the antenna radiation pattern shown in Figure E9-1, what is the beamwidth?
What is the radiation pattern of two 1/4 wavelength vertical antennas spaced 1/4 wavelength apart and fed 90 degrees out of phase?
What aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a Direct Digital Conversion SDR?
What factors affect the bandwidth of a transmitted CW signal?
What is vestigial sideband modulation?
What is the triangulation method of direction finding?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
What is the term for spurious signals generated by the combination of two or more signals in a non-linear device or circuit?
What is a common cause of overmodulation of AFSK signals?
What is the magnitude of the impedance of a parallel RLC circuit at resonance?
What is the purpose of Q1 in the circuit shown in Figure E7-2?
When scheduling EME contacts, which of these conditions will generally result in the least path loss?
What characteristic of a PIN diode makes it useful as an RF switch?
At what time of day can sporadic E propagation occur?
What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2 kHz modulating frequency?
Which of the following conditions apply when transmitting spread spectrum emissions?
What digital protocol is used by APRS?
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?
What is the function of a DX QSL Manager?
How many flip-flops are required to divide a signal frequency by 4?
Which of the following operating arrangements allows an FCC-licensed U.S. citizen to operate in many European countries, and alien amateurs from many European countries to operate in the U.S.?
What is the radiation resistance of an antenna?
Which of the following can be calculated using a Smith chart?
What is the effect of aliasing on a digital oscilloscope caused by setting the time base too slow?
What may be the penalty for a VE who fraudulently administers or certifies an examination?
What term indicates the frequency at which the grounded-base current gain of a transistor has decreased to 0.7 of the gain obtainable at 1 kHz?
What impedance does a 1/8-wavelength transmission line present to a generator when the line is open at the far end?
What is the relationship between the AC current through an inductor and the voltage across an inductor?
What happens when the level of a comparator's input signal crosses the threshold?
Where must the carrier frequency of a CW signal be set to comply with FCC rules for 60 meter operation?
Which of the following amplifier types reduces even-order harmonics?
What occurs when an excessive amount of signal energy reaches a mixer circuit?
What type of antenna can be used to minimize the effects of spin modulation and Faraday rotation?
What core material property determines the inductance of an inductor?
Which of the following can cause shielded cables to radiate or receive interference?