Competence 3 (Deck)

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| By Catherine Halcomb
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  • 1/10 Questions

    What does RADAR stand for?

    • Radio detection and ranging
    • Radio detection and reconnaissance
    • Radio display and reconnaissance
    • Radio Director and reviewer
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About This Quiz

Competence 3 (Deck) assesses knowledge on ARPA (Automatic Radar Plotting Aids) for maritime navigation. It covers determining close quarters situations, handling multiple echoes, identifying radar transponder beacons, and managing ARPA in mixed mode.

Competence 3 (Deck) - Quiz

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  • 2. 

    With regards to ARPA, what does the "lost target" warning tell?

    • Display failure

    • Radar failure

    • Computer failure

    • Target can no longer be plotted

    Correct Answer
    A. Target can no longer be plotted
    Explanation
    The "lost target" warning in ARPA indicates that the target can no longer be plotted. This means that the system is no longer able to track or display the position and movement of the target. This could be due to various reasons such as the target going out of range, being obscured by obstacles, or the target itself being lost or no longer detectable by the radar system.

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  • 3. 

    What is the purpose of the anti-clutter "sea" control on the radar?

    • Reduce the sea echoes

    • Remove wash return from the propeller

    • Increase brilliance of large echoes against sea

    • Intensify sea return

    Correct Answer
    A. Reduce the sea echoes
    Explanation
    The purpose of the anti-clutter "sea" control on the radar is to reduce the sea echoes. This control helps to filter out the unwanted clutter caused by the radar signals bouncing off the surface of the sea. By reducing the sea echoes, the radar can provide a clearer and more accurate representation of other targets or echoes of interest, such as ships or landmasses. This improves the radar's ability to detect and track objects in the presence of clutter, enhancing its overall performance and effectiveness.

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  • 4. 

    The description beside an illustration on a chart would mean a:

    • Radar calibration beacon

    • Radar transponder beacon

    • Radar conspicuous beacon

    • Circular radio beacon

    Correct Answer
    A. Radar transponder beacon
    Explanation
    A radar transponder beacon refers to a device that emits a signal in response to a radar signal, enabling the radar system to detect and locate its position accurately. This type of beacon is commonly used in aviation and marine applications to enhance safety and navigation. It assists radar systems by providing a clear and distinct signal that can be easily identified and tracked.

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  • 5. 

    The components that generate the radio-frequency energy in the form of short powerful pulse is the:

    • Receiver

    • Magnetron

    • Modulator

    • Indicator

    Correct Answer
    A. Magnetron
    Explanation
    The correct answer is Magnetron. A magnetron is a component that generates radio-frequency energy in the form of short powerful pulses. It is commonly used in microwave ovens to produce the electromagnetic waves that heat up the food. The magnetron works by using a high voltage to accelerate electrons towards a series of resonant cavities, where they interact with a magnetic field to generate the desired radio-frequency energy. This energy is then emitted as a short, powerful pulse, which is essential for efficient heating in microwave ovens.

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  • 6. 

    This may occur when a strong echo is received from another ship at close range.

    • Clutter

    • Diffraction

    • False echo

    • Multiple echoes

    Correct Answer
    A. Multiple echoes
    Explanation
    Multiple echoes can occur when a strong echo is received from another ship at close range. This means that the sound waves emitted by the ship bounce off the other ship and return to the original ship, creating multiple echoes. These echoes can interfere with the original signal, causing confusion and making it difficult to accurately interpret the received information. Therefore, multiple echoes can be a result of strong echoes being reflected back from nearby objects or ships.

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  • 7. 

    Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel?

    • Relative track information

    • Predicted time of CPA

    • Initial range of acquisition

    • Set and drift of the current

    Correct Answer
    A. Relative track information
    Explanation
    The relative track information provides data about the direction and speed of the target vessel in relation to your own vessel. By analyzing this information, you can determine if the target vessel is on a course that will bring it into close quarters with your vessel. Therefore, the relative track information is crucial in determining if a close quarters situation will develop with a target vessel.

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  • 8. 

    When using the ARPA in heavy rain, which action should you take?

    • Increase the STC setting to reduce close-in spurious signals.

    • Increase the radar gain to pick up weak echoes through the rain.

    • Navigate as though the effective range of the radar has been reduced.

    • Increase the range of the inner and outer guard rings.

    Correct Answer
    A. Navigate as though the effective range of the radar has been reduced.
    Explanation
    When using the ARPA (Automatic Radar Plotting Aid) in heavy rain, it is essential to navigate as though the effective range of the radar has been reduced. Heavy rain can significantly affect the radar's performance by reducing its range and causing weaker echoes. Therefore, it is crucial to be cautious and adjust navigation accordingly, taking into account the reduced range of the radar. This will help ensure the safety of the vessel and its crew by accounting for the limitations imposed by the heavy rain on the radar's effectiveness.

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  • 9. 

    What is dangerous with operating the ARPA in mixed mode over time?

    • Forgetting that this actually is a mixed mode

    • The ARPA symbols becomes unstable

    • Overloading the computer

    • The target warning are no longer relevnat

    Correct Answer
    A. Forgetting that this actually is a mixed mode
    Explanation
    Operating the ARPA in mixed mode can be dangerous if one forgets that it is in mixed mode. This is because the operator may not be aware of the limitations and specific procedures associated with mixed mode operation. This can lead to errors, incorrect interpretations of data, and potentially dangerous situations. It is important for operators to always be aware of the mode they are operating in to ensure the safe and effective use of the ARPA system.

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  • 10. 

    When the gyro-pilot is used for steering, what control is a adjusted to compensate for varying sea conditions?

    • Weather adjustment

    • Rudder control

    • Lost motion adjustment

    • Sea control

    Correct Answer
    A. Rudder control
    Explanation
    When the gyro-pilot is used for steering, the control that is adjusted to compensate for varying sea conditions is the rudder control. The rudder control is responsible for changing the direction of the vessel by adjusting the angle of the rudder, which helps to maintain stability and control in different sea conditions. By adjusting the rudder control, the gyro-pilot can effectively steer the vessel and compensate for any changes or disturbances caused by varying sea conditions.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jun 17, 2015
    Quiz Created by
    Catherine Halcomb
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