/30 General Class (2023-2027) Online practice test for the U.S. ham radio general license exam. 1 / 30 Which mode is normally used when sending RTTY signals via AFSK with an SSB transmitter? USB DSB LSB CW 2 / 30 How is direct binary FSK modulation generated? By keying an FM transmitter with a sub-audible tone By using a transceiver's computer data interface protocol to change frequencies By changing an oscillator's frequency directly with a digital control signal By reconfiguring the CW keying input to act as a tone generator 3 / 30 What is the output PEP of an unmodulated carrier if the average power is 1060 watts? 530 watts 1500 watts 2120 watts 1060 watts 4 / 30 What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel? 576.9 nanofarads 3,583 picofarads 1,733 picofarads 10.750 nanofarads 5 / 30 How much change in signal strength is typically represented by one S unit? 6 dB 15 dB 18 dB 12 dB 6 / 30 Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna? All these choices are correct The physical length of the boom The spacing of each element along the boom The number of elements on the boom 7 / 30 What circuit is used to select one of the sidebands from a balanced modulator? Filter Carrier oscillator RF amplifier IF amplifier 8 / 30 What usually happens to radio waves with frequencies below the LUF? They pass through the ionosphere They are attenuated before reaching the destination They are refracted and trapped in the ionosphere to circle Earth They are refracted back to Earth 9 / 30 When General class licensees are not permitted to use the entire voice portion of a band, which portion of the voice segment is available to them? The lower frequency portion on frequencies below 7.3 MHz, and the upper portion on frequencies above 14.150 MHz The lower frequency portion The upper frequency portion on frequencies below 7.3 MHz, and the lower portion on frequencies above 14.150 MHz The upper frequency portion 10 / 30 What sound is heard from an audio device experiencing RF interference from a single sideband phone transmitter? On-and-off humming or clicking A steady hum whenever the transmitter is on the air Clearly audible speech Distorted speech 11 / 30 What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter? 101.75 Hz 5 kHz 416.7 Hz 60 kHz 12 / 30 Which symbol in Figure G7-1 represents a tapped inductor? Symbol 1 Symbol 6 Symbol 7 Symbol 11 13 / 30 Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers? Only the hot wires Only the neutral wire All wires Only the ground wire 14 / 30 Which of the following is an odd-order intermodulation product of frequencies F1 and F2? 3F1-F2 5F1-3F2 All these choices are correct 2F1-F2 15 / 30 Which of the following is good amateur practice for net management? Transmit the full net roster at the beginning of every session Always use multiple sets of phonetics during check-in All these choices are correct Have a backup frequency in case of interference or poor conditions 16 / 30 Which of the following describes a linear amplifier? A Class C high efficiency amplifier An amplifier used as a frequency multiplier An amplifier in which the output preserves the input waveform Any RF power amplifier used in conjunction with an amateur transceiver 17 / 30 Which type of code is used for sending characters in a PSK31 signal? Viterbi Varicode Binary Volumetric 18 / 30 Which of the following most limits an HF mobile installation? Efficiency of the electrically short antenna “Picket fencing†The wire gauge of the DC power line to the transceiver FCC rules limiting mobile output power on the 75-meter band 19 / 30 What is a beta or hairpin match? A series capacitor selected to cancel the inductive reactance of a folded dipole antenna A 1/4 wavelength section of 75-ohm coax in series with the feed point of a Yagi to provide impedance matching A shorted transmission line stub placed at the feed point of a Yagi antenna to provide impedance matching A section of 300-ohm twin-lead transmission line used to match a folded dipole antenna 20 / 30 What is a link budget? The financial costs associated with operating a radio link The sum of antenna gains minus system losses The difference between transmit power and receiver sensitivity The sum of transmit power and antenna gains minus system losses as seen at the receiver 21 / 30 Which of the following is characteristic of a direct digital synthesizer (DDS)? Extremely narrow tuning range Variable output frequency with the stability of a crystal oscillator Pure sine wave output Relatively high-power output 22 / 30 When selecting an SSB transmitting frequency, what minimum separation should be used to minimize interference to stations on adjacent frequencies? Approximately 6 kHz 5 Hz to 50 Hz 2 kHz to 3 kHz 150 Hz to 500 Hz 23 / 30 What unit is used to measure reactance? Siemens Ohm Ampere Farad 24 / 30 Which of the following is an advantage of using a horizontally polarized as compared to a vertically polarized HF antenna? Lower feed point impedance Shorter radials Lower ground losses Lower radiation resistance 25 / 30 What makes HF scatter signals often sound distorted? Ground waves are absorbing much of the signal Energy is scattered into the skip zone through several different paths The E region is not present The ionospheric region involved is unstable 26 / 30 Under what circumstances are messages that are sent via digital modes exempt from Part 97 third-party rules that apply to other modes of communication? Under no circumstances When messages are encrypted When messages are not encrypted When under automatic control 27 / 30 Which of the following is required when using FT8? A special hardware modem Receiver attenuator set to -12 dB A vertically polarized antenna Computer time accurate to within approximately 1 second 28 / 30 What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier's TUNE control? A pronounced peak A slow, rhythmic oscillation No change will be observed A pronounced dip 29 / 30 What are the restrictions on messages sent to a third party in a country with which there is a Third-Party Agreement? They must relate to amateur radio, or remarks of a personal character, or messages relating to emergencies or disaster relief They must relate to emergencies or disaster relief They must be for other licensed amateurs The message must be limited to no longer than 1 minute in duration and the name of the third party must be recorded in the station log 30 / 30 Which of the following factors determine the characteristic impedance of a parallel conductor feed line? The distance between the centers of the conductors and the radius of the conductors The distance between the centers of the conductors and the length of the line The radius of the conductors and the frequency of the signal The frequency of the signal and the length of the line Your score is 0% Restart quiz
