What statement is true concerning the keel arrangements of a double bottomed ship?
⢠Difference between a duct keel and an Iâsection keel in a double bottom ship ⢠Meaning of longitudinal vs transverse girders relative to the shipâs centerline ⢠Typical location and purpose of the duct keel (think: access/pipe tunnel along the bottom)
⢠First, decide whether a keel feature that runs along the centerline of the ship is more likely to be longitudinal or transverse. ⢠Think about what a duct keel is used for in tankers and cargo shipsâdoes it run foreâandâaft or sideâtoâside, and does it usually form an enclosed space? ⢠For an Iâsection keel, picture the steel shape: which arrangement of girders (one in the middle or two on each side) would best resemble an "I" when you look at a crossâsection?
⢠Identify which options correctly use longitudinal (foreâandâaft) and transverse (athwartships) relative to the shipâs centerline. ⢠Confirm that the description of the duct keel matches its usual function as an access/pipe tunnel along the centerline in a double bottom. ⢠Eliminate any choices that place the duct keel or Iâsection elements perpendicular to the flat plate keel if that contradicts your understanding of how these structures actually run in the ship.
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