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 a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?
What is the name given to an impurity atom that adds holes to a semiconductor crystal structure?
Which of the following describes the use of vestigial sideband in analog fast-scan TV transmissions?
At what time of day can sporadic E propagation occur?
What is the gain-bandwidth of an operational amplifier?
Which of the following is a type of analog-to-digital conversion?
What impedance does a 1/8-wavelength transmission line present to a generator when the line is shorted at the far end?
What does VOACAP software model?
What could cause local AM broadcast band signals to combine to generate spurious signals in the MF or HF bands?
What core material property determines the inductance of an inductor?
Which of the following describes an Extended Double Zepp antenna?
What is the resonant frequency of an RLC circuit if R is 33 ohms, L is 50 microhenries and C is 10 picofarads?
What do the arcs on a Smith chart represent?
Which of the following is an advantage of BiCMOS logic?
How does the modulation index of a phase-modulated emission vary with RF carrier frequency?
What do Hepburn maps predict?
What is the primary function of an external earth connection or ground rod?
What type of semiconductor device is designed for use as a voltage-controlled capacitor?
How is impedance in polar form converted to an equivalent admittance?
What is the purpose of C2 in the circuit shown in Figure E7-2?
Under what circumstances might the FCC issue a Special Temporary Authority (STA) to an amateur station?
What is an advantage of using top loading in a shortened HF vertical antenna?
Which of the following is an advantage of a Finite Impulse Response (FIR) filter vs an Infinite Impulse Response (IIR) digital filter?
What is the primary purpose of phasing lines when used with an antenna having multiple driven elements?
What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
What is an advantage of placing a grounded electrostatic shield around a small loop direction-finding antenna?
In what direction is the magnetic field oriented about a conductor in relation to the direction of electron flow?
What absorbs the energy from light falling on a photovoltaic cell?
What notifications must be given before transmitting on the 630 meter or 2200 meter bands?
What does a third-order intercept level of 40 dBm mean with respect to receiver performance?
Which of the following amateur stations may transmit one-way communications?
Within what distance must an amateur station protect an FCC monitoring facility from harmful interference?
Which of the following represents capacitive reactance in rectangular notation?
Which of the following frequencies are sometimes used for amateur radio mesh networks?
What occurs when an excessive amount of signal energy reaches a mixer circuit?
What is one way to prevent thermal runaway in a bipolar transistor amplifier?
What information is contained in the lookup table of a direct digital synthesizer (DDS)?
Which of the following device packages is a through-hole type?
What is the maximum power output permitted on the 60 meter band?
Which of the following is an advantage of using an antenna analyzer compared to an SWR bridge to measure antenna SWR?
Which of the following is a circuit that continuously alternates between two states without an external clock?
How much power is being absorbed by the load when a directional power meter connected between a transmitter and a terminating load reads 100 watts forward power and 25 watts reflected power?
What is an advantage of having a variety of receiver IF bandwidths from which to select?
What do the letters FEC mean as they relate to digital operation?
Which filter type is described as having ripple in the passband and a sharp cutoff?
How does ARQ accomplish error correction?
Who does Part 97 task with maintaining the pools of questions for all U.S. amateur license examinations?
What spread spectrum communications technique uses a high-speed binary bit stream to shift the phase of an RF carrier?
Which of the following describes a method of establishing EME contacts?
How is the signal inverted by an inverting linear transponder?