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Doppler Log

CBT 10 questions

First 5 of 10 questions — with answers

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  1. Question 1

    Aerated water can affect a Doppler log. Which one of the options is the most likely to produce aerated water?
    • Passage through a shoal of fish.
    • Varying density layers caused by water temperature differences.
    • The wake caused by the other ships propellers.
    • The Doppler log loses "Bottom track".

  2. Question 2

    Select the option, which correctly completes the following statement: "If undisturbed reverberation measurement in shallow water is not possible, the system automatically switches to...":
    • Water track.
    • Heading mode.
    • Docking mode.
    • Bottom track.

  3. Question 3

    Select from the options given six factors, that are likely to affect a Doppler log system:
    • Density differences in water.
    • Loss of signal or weak signal.
    • Aerated water.
    • Loss of bottom track.
    • Loss of water track.
    • Orientation of the transducer.

  4. Question 4

    Which mode is the most suitable to use if the primary function of the connected ARPA is traffic surveillance?
    • Bottom track.
    • Water track.
    • Track mode.

  5. Question 5

    Which one of the following statement depends on the "Janus configuration"?
    • Small errors due to sound velocity.
    • Small errors due to salinity and density.
    • Small errors due to trim, roll and pitch.
    • High sound energy.

Preview — 5 of 10 questions

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About this CBT test

Doppler Log is a CBT test with 10 questions and verified answers. Common topics include: doppler, log, water, affect, measurement, system, arpa, traffic.

You can practise the free questions online — one at a time, with the correct answer — or unlock the whole test and download it to study offline, without internet.

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