Question 422General Subjects - 1st Asst/Chief
70% to passWhile examining vibration analysis of a particular piece of rotating machinery, one of the measurement location readings exhibits high amplitude/displacement in vertical and horizontal direction at 2 X RPM frequency. What would this indicate?
ABearing problem.
BImbalance.
CBad belt drive.
DMisalignment.
AI Explanation
The correct answer is D) Misalignment. A vibration reading that exhibits high amplitude/displacement in both the vertical and horizontal directions at 2X the RPM frequency typically indicates a misalignment issue with the rotating machinery. Misalignment causes increased cyclic stresses on the bearings, resulting in high vibration at twice the rotational speed. The other options are incorrect because a bearing problem would typically show vibration at 1X RPM, an imbalance would show higher vibration at 1X RPM, and a bad belt drive issue would likely exhibit vibration at the belt pass frequency, not 2X RPM.
Related Questions
Q156:What type of propeller consists of a flat disc set flush with the under surface ... Q353:The intermediate survey for a vessel is typically carried out at what point in t... Q264:An important component of pre-planning for fire emergencies is the fire control ... Q175:When installing a mechanical shaft seal on a pump, it is important to __________... Q82:Scale accumulation on evaporator heat exchange surfaces _______________.
Ready to test your knowledge?
Take a General Subjects - 1st Asst/Chief Practice ExamOfficial Resources