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 phase angle between the voltage across and the current through a series RLC circuit if XC is 500 ohms, R is 1 kilohm, and XL is 250 ohms?
Which of the following describes an extended double Zepp antenna?
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 digital process is applied to I and Q signals in order to recover the baseband modulation information?
How much gain does an antenna have compared to a 1/2-wavelength dipole when it has 6 dB gain over an isotropic antenna?
In the antenna radiation pattern shown in Figure E9-1, what is the front-to-side ratio?
What might be an advantage of a digital vs an analog oscilloscope?
With your transceiver displaying the carrier frequency of phone signals, you hear a station calling CQ on 14.349 MHz USB. Is it legal to return the call using upper sideband on the same frequency?
Which of the following represents a capacitive reactance in polar coordinates?
How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere?
What do the arcs on a Smith chart represent?
What is the resonant frequency of a parallel RLC circuit if R is 33 ohms, L is 50 microhenrys and C is 10 picofarads?
During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?
What is the main reason to use a charge controller with a solar power system?
What is the primary advantage of using a Programmable Gate Array (PGA) in a logic circuit?
In Figure E7-2, what is the purpose of R?
What is a Jones filter as used as part of an HF receiver IF stage?
Why is de-emphasis commonly used in FM communications receivers?
How can conducted and radiated noise caused by an automobile alternator be suppressed?
When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
Which of the following can be used as a relative measurement of the Q for a series-tuned circuit?
How many flip-flops are required to divide a signal frequency by 4?
What is meant by deviation ratio?
Who may be the control operator of an auxiliary station?
Which of the following additional rules apply if you are installing an amateur station antenna at a site at or near a public use airport?
Why is the physical length of a coaxial cable transmission line shorter than its electrical length?
What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?
What usually occurs if a Yagi antenna is designed solely for maximum forward gain?
What is an advantage of using a shielded loop antenna for direction finding?
How does ARQ accomplish error correction?
Which of the following is the most appropriate use of an op-amp active filter?
When may an automatically controlled station originate third party communications?
What does VOACAP software model?
What is the most common data rate used for HF packet?
What is the definition of the term telemetry?
Which is the most common input and output impedance of circuits that use MMICs?
What is the equivalent circuit of a quartz crystal?
How many levels can an analog-to-digital converter with 8 bit resolution encode?
Which of the following is a common use of a hot-carrier diode?
Which of the following indicates likely overmodulation of an AFSK signal such as PSK or MFSK?
What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?
What is a Volunteer Examiner Coordinator?
Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?
How may dangerous levels of carbon monoxide from an emergency generator be detected?
Which of these digital modes has the fastest data throughput under clear communication conditions?
What is the primary characteristic of chordal hop propagation?
How does a narrow-band roofing filter affect receiver performance?
Which of the following indicates that a silicon NPN junction transistor is biased on?
Which of these materials is affected the most by photoconductivity?
What technology is used to track, in real time, balloons carrying amateur radio transmitters?