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About the General Questions category
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0
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15
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December 15, 2025
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G3C02 - What is meant by the term “critical frequency” at a given incidence angle?
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5
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69
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May 13, 2026
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G4C10 - What could be a symptom caused by a ground loop in your station’s audio connections?
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2
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43
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May 12, 2026
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G7B09 - What determines the frequency of an LC oscillator?
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2
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31
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April 30, 2026
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G0B11 - Which of the following is required for lightning protection ground rods?
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0
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36
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December 15, 2025
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G0B05 - Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?
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0
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18
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December 15, 2025
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G0B10 - Which of the following is a danger from lead-tin solder?
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0
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14
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December 15, 2025
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G0B04 - Where should the station’s lightning protection ground system be located?
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0
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13
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December 15, 2025
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G0B09 - Which of the following is true of an emergency generator installation?
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0
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8
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December 15, 2025
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G0B03 - Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring?
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0
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8
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December 15, 2025
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G0B12 - What is the purpose of a power supply interlock?
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0
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12
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December 15, 2025
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G0B06 - Which of the following is covered by the National Electrical Code?
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0
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21
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December 15, 2025
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G0A12 - What stations are subject to the FCC rules on RF exposure?
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0
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25
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December 15, 2025
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G0B08 - What should be done before climbing a tower that supports electrically powered devices?
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0
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12
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December 15, 2025
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G0B02 - According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring with a 20-ampere circuit breaker?
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0
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89
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December 15, 2025
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G0A08 - Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations?
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0
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26
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December 15, 2025
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G0B13 - Where should lightning arrestors be located?
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0
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9
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December 15, 2025
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G0B07 - Which of these choices should be observed when climbing a tower using a safety harness?
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0
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15
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December 15, 2025
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G0B01 - Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?
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0
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12
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December 15, 2025
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G9C01 - Which of the following would increase the bandwidth of a Yagi antenna?
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0
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15
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December 15, 2025
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G9B07 - How does the feed point impedance of a horizontal 1/2 wave dipole antenna change as the antenna height is reduced to 1/10 wavelength above ground?
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0
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20
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December 15, 2025
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G9B01 - What is a characteristic of a random-wire HF antenna connected directly to the transmitter?
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0
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9
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December 15, 2025
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G9D07 - Which of the following describes a log-periodic antenna?
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0
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17
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December 15, 2025
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G9D01 - Which of the following antenna types will be most effective as a near vertical incidence skywave (NVIS) antenna for short-skip communications on 40 meters during the day?
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0
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2
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December 15, 2025
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G9C07 - What does “front-to-back ratio” mean in reference to a Yagi antenna?
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0
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7
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December 15, 2025
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G9B12 - What is the approximate length for a 1/4 wave monopole antenna cut for 28.5 MHz?
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0
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18
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December 15, 2025
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G9B06 - Where should the radial wires of a ground-mounted vertical antenna system be placed?
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0
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10
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December 15, 2025
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G9A11 - What is the effect of transmission line loss on SWR measured at the input to the line?
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0
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11
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December 15, 2025
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G0A07 - What is the effect of modulation duty cycle on RF exposure?
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0
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10
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December 15, 2025
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G0A11 - What precaution should be taken if you install an indoor transmitting antenna?
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0
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14
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December 15, 2025
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