Question 4742 Deck General

The correct answer is A) KG. Increasing riser tension on a semisubmersible drilling unit increases the unit's vertical center of gravity (KG), which is the distance from the keel to the center of gravity. This is because the increased riser tension adds weight to the upper part of the unit, raising the overall center of gravity. The other answer choices are incorrect: B) GM (metacentric height) is not directly affected by increased riser tension. C) Free surface moments are related to the free surface effect, which is not directly impacted by riser tension. D) KM (distance from keel to metacenter) is also not directly affected by increased riser tension.