Question 490General Subjects - Assistant Engineer

The correct answer is B) Vibration frequency. Vibration frequency represents the number of vibration cycles per unit of time, which is a critical parameter in predictive maintenance for shipboard machinery. Vibration frequency provides information about the underlying cause of machinery vibrations, which can indicate potential issues or impending failures. By monitoring vibration frequency, maintenance personnel can identify and address problems before they escalate, improving the reliability and performance of shipboard systems. The other options are not correct because: - Vibration acceleration measures the rate of change in vibration velocity, not the number of cycles per unit time. - Vibration velocity measures the speed of the vibrating component, not the frequency of the vibrations. - Vibration displacement measures the distance the component moves during vibration, not the frequency of the vibrations.