Question 418General Subjects - 1st Asst/Chief

The correct answer is B) Vertical, horizontal and axial. Vibration analysis of rotating machinery, such as those found on vessels, should be conducted by taking measurements in the vertical, horizontal, and axial directions at the bearing housings and foundations. This is because vibrations can occur in multiple planes, and examining all three directions provides a comprehensive assessment of the operating condition of the equipment. The other answer choices are incorrect because they do not capture all the necessary measurement directions. Option A) only includes vertical and horizontal, missing the critical axial direction. Option C) omits the vertical direction, and option D) omits the horizontal direction, both of which are important for a thorough vibration analysis.