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.
Which of these methods is commonly used to convert analog signals to digital signals?
What circuit element is controlled by a series analog voltage regulator to maintain a constant output voltage?
What is a disadvantage of using a multiband trapped antenna?
How many watts are consumed in a circuit having a power factor of 0.71 if the apparent power is 500VA?
What limitations may the FCC place on an amateur station if its signal causes interference to domestic broadcast reception, assuming that the receivers involved are of good engineering design?
What third family of circles is often added to a Smith chart during the process of solving problems?
Which of the following conditions apply when transmitting spread spectrum emission?
With your transceiver displaying the carrier frequency of CW signals, you hear a DX station's CQ on 3.500 MHz. Is it legal to return the call using CW on the same frequency?
In Figure E6-3, what is the schematic symbol for a light-emitting diode?
What is the triangulation method of direction finding?
What type of logic defines "0" as a high voltage?
Where are the questions for all written U.S. amateur license examinations listed?
What characteristics of the MMIC make it a popular choice for VHF through microwave circuits?
What does the impedance 50-j25 represent?
What is the phase relationship between the current through and the voltage across a series resonant circuit at resonance?
What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?
What technology is used to track, in real time, balloons carrying amateur radio transmitters?
Which of these materials is affected the most by photoconductivity?
What is meant by circularly polarized electromagnetic waves?
Which of the following is caused by missing codes in an SDR receiver's analog-to-digital converter?
What impedance does a 1/4 wavelength transmission line present to a generator when the line is open at the far end?
How are the capacitors and inductors of a low-pass filter Pi-network arranged between the network's input and output?
Which of the following semiconductor materials contains excess free electrons?
By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?
Which of the following displays multiple digital signal states simultaneously?
Which of the following digital modes is especially useful for EME communications?
What types of communications may be transmitted to amateur stations in foreign countries?
What is one advantage of using ASCII code for data communications?
How many lines are commonly used in each frame of an amateur slow-scan color television picture?
Which of the following describes an extended double Zepp antenna?
What is the phase angle between the voltage across and the current through a series RLC circuit if XC is 100 ohms, R is 100 ohms, and XL is 75 ohms?
What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?
What is a telecommand station in the amateur satellite service?
What is one way a single-sideband phone signal can be generated?
What is a disadvantage of decreasing the number of wire segments in an antenna model below the guideline of 10 segments per half-wavelength?
During a VHF/UHF contest, in which band segment would you expect to find the highest level of activity?
What is the primary purpose of a phasing line when used with an antenna having multiple driven elements?
In Figure E6-5, what is the schematic symbol for a NOR gate?
What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?
Which of the following is a characteristic of a good DC voltmeter?
What digital process is applied to I and Q signals in order to recover the baseband modulation information?
What core material property determines the inductance of a toroidal inductor?
What does a third-order intercept level of 40 dBm mean with respect to receiver performance?
What is meant by antenna gain?
What is a major cause of atmospheric static?
Which of the following injuries can result from using high-power UHF or microwave transmitters?
How is positive feedback supplied in a Hartley oscillator?
Why are switching amplifiers more efficient than linear amplifiers?
How is the timing of JT65 contacts organized?