Practice Test Geeks(GROL) General Radiotelephone Operator License Practice Test
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General Radiotelephone Flashcards

7 cards from real GROL practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 General Radiotelephone flashcards as text

  1. What is the effect on antenna gain when the antenna's physical aperture is doubled while its frequency remains constant?

    Answer: Gain doubles (increases by approximately 3 dB)

    Doubling the aperture area doubles the effective capture area, which doubles power gain — an increase of approximately 3 dB.

  2. A GROL licensee is responsible for ensuring which of the following about a ship station transmitter?

    Answer: That it operates within its licensed frequency and power authorizations

    The licensed GROL operator must ensure the transmitter operates on authorized frequencies and within its licensed power limits per FCC Part 80 rules.

  3. In a transmission line, what condition causes maximum power transfer from the transmitter to the antenna?

    Answer: The line impedance equals the antenna impedance (matched condition)

    Maximum power transfer occurs when the source, transmission line, and load impedances are all matched, resulting in an SWR of 1:1.

  4. What is the function of a squelch circuit in a VHF marine radio?

    Answer: It silences the receiver output when no carrier signal is detected

    The squelch circuit mutes the speaker when no signal is present, eliminating the annoying noise heard between transmissions.

  5. Which of the following describes the Automatic Identification System (AIS) used on vessels?

    Answer: A VHF transponder system that broadcasts vessel position, identity, and voyage data

    AIS is a VHF-based system that automatically broadcasts and receives vessel position, identification, speed, and course to nearby ships and shore stations.

  6. What is the purpose of a low-pass filter installed at a transmitter output?

    Answer: To reduce harmonic emissions that could cause interference

    A low-pass filter passes the fundamental transmit frequency while attenuating harmonics, preventing illegal interference on other services.

  7. Which propagation mode allows VHF signals to travel well beyond the normal line-of-sight range by bending around the horizon?

    Answer: Tropospheric ducting

    Tropospheric ducting occurs when temperature inversions trap VHF/UHF signals, guiding them hundreds of miles beyond normal line-of-sight range.