Advanced Analysis Beyond Waveform And Spectrum

10 Questions | Total Attempts: 91

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Advanced Analysis Beyond Waveform And Spectrum

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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