/30 Technician Class (2022-2026) Online practice test for the U.S. ham radio technician license exam. 1 / 30 Under which of the following circumstances are one-way transmissions by an amateur station prohibited? Telecommand or transmissions of telemetry Broadcasting International Morse Code Practice In all circumstances 2 / 30 Why do most solid-state transmitters reduce output power as SWR increases beyond a certain level? To comply with FCC rules on spectral purity Because power supplies cannot supply enough current at high SWR To protect the output amplifier transistors To lower the SWR on the transmission line 3 / 30 What is an amateur station's control point? The location of the station's transmitting antenna The mailing address of the station licensee The location at which the control operator function is performed The location of the station's transmitting apparatus 4 / 30 Which type of modulation is commonly used for VHF and UHF voice repeaters? AM FM or PM SSB PSK 5 / 30 When may amateur stations transmit information in support of broadcasting, program production, or news gathering, assuming no other means is available? When broadcasting communications to or from the space shuttle Where noncommercial programming is gathered and supplied exclusively to the National Public Radio network Never When such communications are directly related to the immediate safety of human life or protection of property 6 / 30 Which of the following devices or circuits changes an alternating current into a varying direct current signal? Amplifier Reflector Rectifier Transformer 7 / 30 Which of the following receiver filter bandwidths provides the best signal-to-noise ratio for SSB reception? 1000 Hz 500 Hz 5000 Hz 2400 Hz 8 / 30 What is the FCC Part 97 definition of a space station? An amateur station using amateur radio satellites for relay of signals A manned satellite orbiting Earth An amateur station located more than 50 km above Earth's surface Any satellite orbiting Earth 9 / 30 What is a good way to guard against electrical shock at your station? Install mechanical interlocks in high-voltage circuits Connect all AC powered station equipment to a common safety ground Use three-wire cords and plugs for all AC powered equipment All these choices are correct 10 / 30 What is the approximate bandwidth of a typical single sideband (SSB) voice signal? 1 kHz 6 kHz 15 kHz 3 kHz 11 / 30 Electrical current is measured in which of the following units? Amperes Ohms Watts Volts 12 / 30 Why is the radio horizon for VHF and UHF signals more distant than the visual horizon? Radio waves are blocked by dust particles The atmosphere refracts radio waves slightly Radio signals move somewhat faster than the speed of light Radio waves are not blocked by dust particles 13 / 30 What hazard is caused by charging or discharging a battery too quickly? Excess output ripple Overheating or out-gassing Half-wave rectification Inverse memory effect 14 / 30 What type of electrical component stores energy in a magnetic field? Inductor Varistor Diode Capacitor 15 / 30 Where should a lightning arrester be installed in a coaxial feed line? On a grounded panel near where feed lines enter the building At the ac power service panel At the antenna feed point At the output connector of a transceiver 16 / 30 How are the transceiver audio input and output connected in a station configured to operate using FT8? To a computer connected to the FT8converter.com website To a computer running a terminal program and connected to a terminal node controller unit To the audio input and output of a computer running WSJT-X software To an FT8 conversion unit, a keyboard, and a computer monitor 17 / 30 Which of the following is a disadvantage of FM compared with single sideband? Voice quality is poorer All these choices are correct Only one signal can be received at a time FM signals are harder to tune 18 / 30 Which of the following applies when two stations transmitting on the same frequency interfere with each other? The stations should negotiate continued use of the frequency Interference is inevitable, so no action is required Both stations should choose another frequency to avoid conflict Use subaudible tones so both stations can share the frequency 19 / 30 Which of the following is a source of loss in coaxial feed line? Water intrusion into coaxial connectors High SWR Multiple connectors in the line All these choices are correct 20 / 30 What is a transceiver? A device that combines a receiver and transmitter A device for converting receiver and transmitter frequencies to another band A device for matching feed line impedance to 50 ohms A device for automatically sending and decoding Morse code 21 / 30 What is component 4 in figure T-3? Dummy load Ground Transmitter Antenna 22 / 30 Where should an RF power meter be installed? In parallel with the push-to-talk line and the antenna In the feed line, between the transmitter and antenna At the power supply output In the power supply cable, as close as possible to the radio 23 / 30 Which of the following describes DMR? A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel An automatic position tracking mode for FM mobiles communicating through repeaters A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction An automatic computer logging technique for hands-off logging when communicating while operating a vehicle 24 / 30 Who selects a Frequency Coordinator? The local chapter of the Office of National Council of Independent Frequency Coordinators Amateur operators in a local or regional area whose stations are eligible to be repeater or auxiliary stations The FCC Office of Spectrum Management and Coordination Policy FCC Regional Field Office 25 / 30 What electrical component is typically constructed as a coil of wire? Diode Switch Capacitor Inductor 26 / 30 What hazard exists in a power supply immediately after turning it off? Charge stored in filter capacitors Leakage flux in the power transformer Circulating currents in the dc filter Voltage transients from kickback diodes 27 / 30 Which of the following is used to determine if an antenna is resonant at the desired operating frequency? A Q meter A frequency counter A VTVM An antenna analyzer 28 / 30 What is the Amateur Radio Emergency Service (ARES)? A training program that certifies amateur operators for membership in the Radio Amateur Civil Emergency Service A group of licensed amateurs who have voluntarily registered their qualifications and equipment for communications duty in the public service A training program that provides licensing courses for those interested in obtaining an amateur license to use during emergencies A group of licensed amateurs who are members of the military and who voluntarily agreed to provide message handling services in the case of an emergency 29 / 30 Which is equal to 1,000,000 picofarads? 1000 microfarads 1 microfarad 1,000,000,000 microfarads 0.001 microfarads 30 / 30 What is the resistance of a circuit in which a current of 3 amperes flows when connected to 90 volts? 30 ohms 93 ohms 3 ohms 270 ohms Your score is 0% Restart quiz