Discussion
Precession rate for a fixed disturbing torque as rotor speed decays.
| Rotor speed (rpm) | Relative angular momentum | Relative precession rate |
|---|---|---|
| 20 000 | 1.00 | 1.00 |
| 15 000 | 0.75 | 1.33 |
| 10 000 | 0.50 | 2.00 |
| 5 000 | 0.25 | 4.00 |
What operational warning does this table carry?
Answer: C
Precession rate is inversely proportional to angular momentum, so the drift climbs steeply as speed decays. The instrument keeps producing a believable reading throughout, which is exactly what makes a failing vacuum pump dangerous.
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