Vib3 - Quiz 1

QuizÂ by Brett Scott

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18 questions
• Q1
What 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
• Q2
Identify 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 2
Stage 4
Stage 1
Stage 3
30s
• Q3
Identify the bearing failure stage: ultrasonic energy increases, bearing natural frequencies show up between 20k - 120k in the spectrum
Stage 2
Stage 1
Stage 3
Stage 4
30s
• Q4
Identify 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 2
Stage 4
Stage 3
Stage 1
30s
• Q5
Identify 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 2
Stage 3
Stage 1
Stage 4
30s
• Q6
Which bearing fault frequency would likely have higher amplitude just based on the distance from the transducer?
Inner Race
BSF
Outer Race
They are the same distance away.
30s
• Q7
Which 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 Frequency
BPFO (outer race)
FTF (cage)
BPFI (inner race)
30s
• Q8
At what failure stage should bearings be replaced at?
Any stage, it is up to the analyst.
Stage 1
Stage 2
Stage 4
30s
• Q9
How would a fault on a rolling element (ball) usually appear in a spectrum?
Raised noise floor around 120,000cpm
30,000cpm peak
BPFI
BSF or FTF (fundamental frequency or sideband around another fault frequency)
30s
• Q10
What is the best way to estimate bearing fault severity?
Look for increase in ultrasonic energy
Look for increased amplitude of running speed peak
Look for increase in amplitude of fault frequencies
Look for increase in harmonics or sidebands around fault frequencies
30s
• Q11
It may be easier to find bearing faults in the time waveform data in very slow speed machines.
False
True
30s
• Q12
What peak in the spectrum would you trend in order to find flow problems in a 1500 RPM pump with 10 impeller vanes?
10cpm
1800cpm
1500cpm
15,000cpm
30s
• Q13
A pump operating under excessive capacity or low suction pressure will likely suffer from what condition?
Misalignment
Cavitation
Imbalance
Surge
30s
• Q14
What kind of spectral data would you expect to see from a pump that was suffering from cavitation?
All of these are correct
Broad energy with a raised noise floor around 20,000cpm - 120,000cpm
Increased amplitude in the 2x running speed peak
A peak at .36x - .48x
30s
• Q15
What Fmax should you use for a gearbox with a known # of teeth?
1 x GMF
3.25 x GMF
200 x Running Speed
30s

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