/30 General Class (2023-2027) Online practice test for the U.S. ham radio general license exam. 1 / 30 What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna? Short antennas are more likely to cause distortion of transmitted signals Harmonic radiation may increase Operating bandwidth may be very limited Q of the antenna will be very low 2 / 30 What combination of a mixer's Local Oscillator (LO) and RF input frequencies is found in the output? The average The arithmetic product The ratio The sum and difference 3 / 30 What is the purpose of a corona ball on an HF mobile antenna? To increase the “Q†of the antenna To reduce the chance of damage if the antenna should strike an object To reduce RF voltage discharge from the tip of the antenna while transmitting To narrow the operating bandwidth of the antenna 4 / 30 Which is true of mesh network microwave nodes? Links between two nodes in a network may have different frequencies and bandwidths More nodes reduce overall microwave out of band interference Having more nodes increases signal strengths If one node fails, a packet may still reach its target station via an alternate node 5 / 30 How can the effects of ground loops be minimized? Bond equipment enclosures together Avoid using lock washers and star washers when making ground connections Connect the AC neutral conductor to the ground wire Connect all ground conductors in series 6 / 30 Which type of code is used for sending characters in a PSK31 signal? Volumetric Viterbi Binary Varicode 7 / 30 Which of the following describes an azimuthal projection map? A map that shows accurate land masses A map that shows the angle at which an amateur satellite crosses the equator A map that shows the number of degrees longitude that an amateur satellite appears to move westward at the equator with each orbit A map that shows true bearings and distances from a specific location 8 / 30 What is the relationship between transmitted symbol rate and bandwidth? Symbol rate and bandwidth are not related Lower symbol rates require wider bandwidth Higher symbol rates require wider bandwidth Bandwidth is half the symbol rate 9 / 30 How does a noise blanker work? By temporarily increasing received bandwidth By clipping noise peaks By redirecting noise pulses into a filter capacitor By reducing receiver gain during a noise pulse 10 / 30 What is another term for the mixing of two RF signals? Synthesizing Phase inversion Heterodyning Frequency inversion 11 / 30 What is the purpose of a power supply interlock? To shut off the power supply if too much voltage is produced To shut down the unit if it becomes too hot To ensure that dangerous voltages are removed if the cabinet is opened To prevent unauthorized changes to the circuit that would void the manufacturer's warranty 12 / 30 What is VARA? A radio direction finding system used on VHF and UHF A digital protocol used with Winlink A low signal-to-noise digital mode used for EME (moonbounce) DX spotting system using a network of software defined radios 13 / 30 What is one reason to use an impedance matching transformer at a transmitter output? To reduce power supply ripple To minimize radiation resistance To minimize transmitter power output To present the desired impedance to the transmitter and feed line 14 / 30 Who may receive partial credit for the elements represented by an expired amateur radio license? Any person who can demonstrate that they once held an FCC-issued General, Advanced, or Amateur Extra class license that was not revoked by the FCC Anyone who held an FCC-issued amateur radio license that expired not less than 5 and not more than 15 years ago Any person who previously held an amateur license issued by another country, but only if that country has a current reciprocal licensing agreement with the FCC Only persons who once held an FCC issued Novice, Technician, or Technician Plus license 15 / 30 What is the primary function of antenna traps? To prevent out-of-band operation To enable multiband operation To notch spurious frequencies To provide balanced feed point impedance 16 / 30 Which of the following devices can be used for impedance matching at radio frequencies? A transformer A Pi-network A length of transmission line All these choices are correct 17 / 30 Which frequency will have the least attenuation for long-distance skip propagation? Just above the critical frequency Just below the MUF Just above the LUF Just below the critical frequency 18 / 30 Which of the following describes the function of a two-input AND gate? Output is low only when both inputs are high Output is high when either or both inputs are low Output is low when either or both inputs are high Output is high only when both inputs are high 19 / 30 What is the feed point impedance of an end-fed half-wave antenna? Very high Approximately 50 ohms Approximately 300 ohms Very low 20 / 30 How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes? VHF/UHF ducting is improved VHF/UHF ducting is disturbed HF communication is disturbed HF communication is improved 21 / 30 What portion of the AC cycle is converted to DC by a full-wave rectifier? 270 degrees 360 degrees 180 degrees 90 degrees 22 / 30 What portion of the AC cycle is converted to DC by a half-wave rectifier? 90 degrees 270 degrees 180 degrees 360 degrees 23 / 30 Which of the following must be connected to an antenna analyzer when it is being used for SWR measurements? Transmitter Receiver All these choices are correct Antenna and feed line 24 / 30 What is the capacitance of three 100-microfarad capacitors connected in series? 33.3 microfarads 3.0 microfarads 300 microfarads 0.33 microfarads 25 / 30 Which of the following is required when using FT8? Receiver attenuator set to -12 dB A special hardware modem A vertically polarized antenna Computer time accurate to within approximately 1 second 26 / 30 Where should the station's lightning protection ground system be located? Next to the closest power pole Outside the building As close to the station equipment as possible Parallel to the water supply line 27 / 30 What transformer turns ratio matches an antenna's 600-ohm feed point impedance to a 50-ohm coaxial cable? 3.5 to 1 12 to 1 144 to 1 24 to 1 28 / 30 What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding? Mutual inductance Capacitive coupling Mutual capacitance Displacement current coupling 29 / 30 What is the approximate forward threshold voltage of a germanium diode? 0.7 volts 1.0 volts 0.3 volts 0.1 volt 30 / 30 How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9? Approximately 8 times Approximately 1.5 times Approximately 2 times Approximately 4 times Your score is 0% Restart quiz
