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.
When several electrolytic filter capacitors are connected in series to increase the operating voltage of a power supply filter circuit, why should resistors be connected across each capacitor?
What happens when the level of a comparator's input signal crosses the threshold?
What does SAR measure?
What is the term for the blocking of one FM phone signal by another, stronger FM phone signal?
What is one common use for PIN diodes?
What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?
What is the relationship between symbol rate and baud?
What is a solid state relay?
Which of the following is true of a charge-coupled device (CCD)?
What is the maximum power output permitted on the 60 meter band?
What is susceptance?
How many turns will be required to produce a 1-mH inductor using a core that has an inductance index (A L) value of 523 millihenrys/1000 turns?
What is a characteristic of a grounded-grid amplifier?
What is an Earth station in the amateur satellite service?
What types of amateur stations may automatically retransmit the radio signals of other amateur stations?
What is the approximate ratio of PEP-to-average power in a typical single-sideband phone signal?
What term best describes the interactions at the load end of a mismatched transmission line?
What is one advantage of using ASCII code for data communications?
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?
What is a phase-locked loop circuit?
What are the distinguishing features of an elliptical filter?
What is the approximate physical length of a solid polyethylene dielectric coaxial transmission line that is electrically one-quarter wavelength long at 7.2 MHz?
What is a depletion-mode FET?
From which of the following bands is amateur radio contesting generally excluded?
Which of the following can be used to generate FM phone emissions?
What current flows equally on all conductors of an unshielded multi-conductor cable?
What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission?
On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?
By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?
What is the effect of aliasing in a digital or computer-based oscilloscope?
What is meant by the term op-amp input offset voltage?
Which of the following is a possible reason that attempts to initiate contact with a digital station on a clear frequency are unsuccessful?
How many watts are consumed in a circuit having a power factor of 0.6 if the input is 200VAC at 5 amperes?
Which of the following choices is a way to improve the efficiency of a ground-mounted quarter-wave vertical antenna?
Which of the following is a characteristic of a good DC voltmeter?
What type of information can be obtained by submitting the details of a proposed new antenna to a modeling program?
What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?
What privileges are authorized in the U.S. to persons holding an amateur service license granted by the Government of Canada?
Which of the following represents a capacitive reactance in polar coordinates?
Which of the following would provide the best RF ground for your station?
What sets the minimum detectable signal level for an SDR in the absence of atmospheric or thermal noise?
What is the direction of an ascending pass for an amateur satellite?
What frequencies are authorized to an amateur station operating under RACES rules?
What characterizes libration fading of an EME signal?
How does JT65 improve EME communications?
What is a characteristic of a monostable multivibrator?
How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?
Which of the following may reduce or eliminate intermodulation interference in a repeater caused by another transmitter operating in close proximity?
When constructing a Beverage antenna, which of the following factors should be included in the design to achieve good performance at the desired frequency?
What is the minimum passing score on amateur operator license examinations?