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 can be done to prevent unwanted oscillations in an RF power amplifier?
In the antenna radiation pattern shown in Figure E9-1, what is the beamwidth?
What core material property determines the inductance of an inductor?
What parameter describes the interactions at the load end of a mismatched transmission line?
How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?
Why is an anti-aliasing digital filter required in a digital decimator?
How should an antenna analyzer be connected when measuring antenna resonance and feed point impedance?
What is meant by the term mode? as applied to an amateur radio satellite?
How is power supplied to the most common type of MMIC?
Which filter type is described as having ripple in the passband and a sharp cutoff?
What does a receiver noise floor of -174 dBm represent?
How many horizontal lines make up a fast-scan (NTSC) television frame?
What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 25 ohms, R is 100 ohms, and XL is 50 ohms?
Which type of detector circuit is used for demodulating SSB signals?
How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?
What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?
What current flows equally on all conductors of an unshielded multi-conductor cable?
How can the output voltage of a multiple-turn receiving loop antenna be increased?
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?
What device is typically used as a stable voltage reference in a linear voltage regulator?
Which of the following data are used by the APRS network to communicate station location?
Which amateur stations are eligible to be telecommand stations of space stations (subject to the privileges of the class of operator license held by the control operator of the station)?
What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?
What is used to control the attenuation of RF signals by a PIN diode?
Why are optoisolators often used in conjunction with solid-state circuits when switching 120 VAC?
Which of the following HF digital modes can be used to transfer binary files?
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?
On the Smith chart shown in Figure E9-3, what is the only straight line shown?
Which of the following methods measures intermodulation distortion in an SSB transmitter?
Which of the following best describes the Volunteer Examiner accreditation process?
What is an operational amplifier?
What is the resonant frequency of an RLC circuit if R is 22 ohms, L is 50 microhenries and C is 40 picofarads?
What is the name of the process that shows that a square wave is made up of a sine wave plus all its odd harmonics?
What is the relationship between symbol rate and baud?
At what level below a signal's mean power level is its bandwidth determined according to FCC rules?
Under what circumstances might the FCC issue a Special Temporary Authority (STA) to an amateur station?
Where must the carrier frequency of a CW signal be set to comply with FCC rules for 60 meter operation?
Where should a high Q loading coil be placed to minimize losses in a shortened vertical antenna?
What is the most common method of reducing key clicks?
How may dangerous levels of carbon monoxide from an emergency generator be detected?
Tropospheric propagation of microwave signals often occurs in association with what phenomenon?
What type of logic defines "1" as a high voltage?
What is the effect of adding a terminating resistor to a rhombic antenna?
Which of the following reduces the likelihood of receiver desensitization?
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 the Cabrillo format?
Why does the radio-path horizon distance exceed the geometric horizon?
How can an oscillator's microphonic responses be reduced?
What is the name of the diagram used to show the phase relationship between impedances at a given frequency?
In Figure E6-3, what is the schematic symbol for a NOR gate?