Vib3 - Quiz 1
Quiz by Brett Scott
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18 questions
Show answers
- Q1What does the L10 Life formula tell us?Remaining useful life of a motor.Remaining useful life of a lubricant.Recommended hours that a bearing should run in a 10hr day.Number of hours that 90% of a group of bearings should attain prior to the onset of failure.30s
- Q2Identify the bearing failure stage: ultrasonic energy increases, no increase in noise or heat, no indication in the normal spectrum. If the bearing was examined in may not show any signs of damage.Stage 2Stage 4Stage 1Stage 330s
- Q3Identify the bearing failure stage: ultrasonic energy increases, bearing natural frequencies show up between 20k - 120k in the spectrumStage 2Stage 1Stage 3Stage 430s
- Q4Identify the bearing failure stage: BPFI, BPFO, BSF, & FTF begin to show up in the spectrum, spike energy (ultrasonic energy) increase, may be slight increase in heat & noise.Stage 2Stage 4Stage 3Stage 130s
- Q5Identify the bearing failure stage: increase in bearing frequency sidebands or harmonics, may see multiple running speed harmonics, increased noise/heat, the ultrasonic energy may decrease.Stage 2Stage 3Stage 1Stage 430s
- Q6Which bearing fault frequency would likely have higher amplitude just based on the distance from the transducer?Inner RaceBSFOuter RaceThey are the same distance away.30s
- Q7Which bearing fault frequency may show up at a fundamental frequency of around .33x - .48x but is more likely to show up as a sideband around another bearing fault frequency?Bearing Natural FrequencyBPFO (outer race)FTF (cage)BPFI (inner race)30s
- Q8At what failure stage should bearings be replaced at?Any stage, it is up to the analyst.Stage 1Stage 2Stage 430s
- Q9How would a fault on a rolling element (ball) usually appear in a spectrum?Raised noise floor around 120,000cpm30,000cpm peakBPFIBSF or FTF (fundamental frequency or sideband around another fault frequency)30s
- Q10What is the best way to estimate bearing fault severity?Look for increase in ultrasonic energyLook for increased amplitude of running speed peakLook for increase in amplitude of fault frequenciesLook for increase in harmonics or sidebands around fault frequencies30s
- Q11It may be easier to find bearing faults in the time waveform data in very slow speed machines.FalseTrue30s
- Q12What peak in the spectrum would you trend in order to find flow problems in a 1500 RPM pump with 10 impeller vanes?10cpm1800cpm1500cpm15,000cpm30s
- Q13A pump operating under excessive capacity or low suction pressure will likely suffer from what condition?MisalignmentCavitationImbalanceSurge30s
- Q14What kind of spectral data would you expect to see from a pump that was suffering from cavitation?All of these are correctBroad energy with a raised noise floor around 20,000cpm - 120,000cpmIncreased amplitude in the 2x running speed peakA peak at .36x - .48x30s
- Q15What Fmax should you use for a gearbox with a known # of teeth?1 x GMF3.25 x GMF200 x Running Speed30s