Practice Test Geeks(MMC) Merchant Mariner Credential Practice Test
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Ship Construction & Stability Flashcards

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

Read the first 7 Ship Construction & Stability flashcards as text

  1. The 'wall-sided formula' for GZ is used when:

    Answer: The ship's sides are vertical at the waterline and the angle of heel is moderate

    The wall-sided formula GZ = sin θ (GM + ½BM tan²θ) applies when the ship's waterplane sides are vertical over the range of heel considered.

  2. A vessel trims by the stern when:

    Answer: The center of gravity is aft of the center of buoyancy longitudinally

    Stern trim results when G is longitudinally aft of B, causing a trimming moment that depresses the stern and raises the bow.

  3. The intact stability criterion requiring the area under the GZ curve between 0° and 30° heel to be at least 0.055 m·rad is specified by:

    Answer: IMO Resolution A.749 (IS Code)

    IMO Resolution A.749, the Intact Stability Code, sets minimum GZ area criteria including at least 0.055 m·rad between 0° and 30° of heel.

  4. The purpose of a cofferdam in ship construction is to:

    Answer: Provide a void space separating two tanks containing different liquids

    A cofferdam is an empty void space between two tanks, preventing contamination or migration of liquids between adjacent compartments.

  5. Floodable length at a given position on a vessel is the maximum length of compartment that can be flooded without:

    Answer: Submerging the margin line

    Floodable length is the length of the largest compartment that can be opened to the sea without immersing the margin line, which is 76 mm below the freeboard deck edge.

  6. The 'factor of subdivision' (F) in damage stability calculations relates to:

    Answer: The required degree of subdivision based on ship type and length

    The factor of subdivision F (between 0 and 1) determines the required safety margin; the smaller F, the greater the required subdivision for the vessel.

  7. The double bottom on a ship serves which TWO primary purposes?

    Answer: Structural strength and watertight reserve buoyancy after grounding

    The double bottom provides longitudinal structural strength and, because it creates a watertight inner bottom, limits flooding to the outer bottom after grounding damage.