• Common questions for those having little or no experience with vibration analysis are “Should I attend the Entry or Analysis I seminar?” and “Am I ready for Analysis I?”
  • Analysis I assumes and builds on what is taught in Entry Class and assumes the student has a basic understanding of vibration measurement and analysis.
  • The following questions are taken from the Entry textbook and are designed to help you make the decision on which class you should first take.
  • It is recommended that you start with the Entry seminar if you cannot fully and confidently answer 24 (80%) of the following 30 questions:

Vibration Assessment Quiz

  1. What are the 5 essential steps in most successful PdM programs?

  2. What are the 3 basic characteristics measured in vibration?

  3. How does decreasing dynamic resistance affect amplitude response?

  4. What is the period (T) of vibration?

  5. What is the difference between a Natural Frequency and a Resonance?

  6. What is the difference between a Resonance and a Critical Speed?

  7. What units are used to express vibration amplitude?

  8. When should you use one vibration amplitude unit versus the others?

  9. What is phase and why must it be used?

  10. What is Transducer Sensitivity and why is it important to know?

  11. What is Frequency Range (sometimes called FMAX)?

  12. What is a low frequency accelerometer and when must you use it?

  13. What is Sensor Power and when must you enable it in your analyzer?

  14. What is Auto Range and when should you use it?

  15. What advantages does a Shear Mode Accelerometer have over a Compression Mode Accelerometer?

  16. What are the common “Average Types" used in data acquisition?

  17. What are Routes?

  18. Why do Sideband Frequencies appear in a spectrum?

  19. How do Sideband Frequencies help the analyst detect certain problems?

  20. How does a Beat differ from classic Amplitude Modulation?

  21. What is a Subsynchronous Frequency?

  22. What is a Nonsynchronous Frequency?

  23. What is a Harmonic Frequency?

  24. Are most rolling element fault frequencies Synchronous, Nonsynchronous or Subsynchronous?

  25. What indicates the severity of a gear problem?

  26. Why does high amplitude at 2X Line frequency indicate an eccentric rotor in an AC induction motor?
  27. What condition is indicated by the presence of many running speed harmonics in a vibration velocity spectrum?
  28. What is typically the problem when vibration phase at 1X, 2X and/or 3X RPM is nearly 180 degrees out of phase across a coupling?

  29. What is the difference between Route Mode and Analysis Mode in a vibration analyzer?

  30. What is Dynamic Range and how does it affect the display of a vibration spectrum?


1230 West Morehead Street, Suite 400

Charlotte, North Carolina  28208