Advanced Analysis Beyond Waveform And Spectrum

10 Questions | Total Attempts: 105

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Advanced Analysis Beyond Waveform And Spectrum - Quiz

This quiz is to help with understanding and applying tools that are included in many portable vibration instruments. Topics dealing with coastdown, bump test, cross-channel phase, and long time waveform functionality are covered.


Questions and Answers
  • 1. 
    What tool can be used to determine natural frequencies on a machine?
    • A. 

      Coastdown

    • B. 

      Bump Test

    • C. 

      Long Time Waveform

    • D. 

      All of the above

  • 2. 
    What tool can be used to determine relative motion of machine components?
    • A. 

      Coastdown

    • B. 

      Bump Test

    • C. 

      Cross-channel Phase

    • D. 

      Long Time Waveform

  • 3. 
    Cross-channel phase measurement requires a reference signal (tachometer) input.
    • A. 

      True

    • B. 

      False

  • 4. 
    Bump testing requires a calibrated modal hammer.
    • A. 

      True

    • B. 

      False

  • 5. 
    Cross-channel phase measurement can detect the following problem.
    • A. 

      Soft foot

    • B. 

      Misalignment

    • C. 

      Couple unbalance

    • D. 

      All of the above

  • 6. 
    What is a plot type that is commonly used with a coastdown for resonance detection?
    • A. 

      Orbit

    • B. 

      Time waveform

    • C. 

      Single point spectrum

    • D. 

      Bode

  • 7. 
    A Bode plot provides both the vibration magnitude and phase display for each speed measurement and requires a reference input.
    • A. 

      True

    • B. 

      False

  • 8. 
    A Bump test cannot be performed for any analysis work while the machine is running.
    • A. 

      True

    • B. 

      False

  • 9. 
    In trying to capture an event on a machine that is really hard to catch with one sample, one would use:
    • A. 

      Coastdown

    • B. 

      Cross-channel phase

    • C. 

      Long Time Waveform

    • D. 

      Bump Test

  • 10. 
     Bump testing typically uses the following type of averaging on the spectral processing.
    • A. 

      Linear

    • B. 

      Logarithmic

    • C. 

      Exponential

    • D. 

      Peak Hold

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