Discussion
Match each technology in List I with its principal limitation in List II.
List I
A. Air-driven spinning mass
B. Electric spinning mass
C. Ring laser gyro
D. Fibre optic gyro
List II
1. Gradual undetected failure as the pump or filter degrades
2. Bearing wear producing real drift
3. Lock-in at very low rotation rates
4. Sensitivity to temperature variation
Select the correct match.
Answer: D
Correct answer: A-1, B-2, C-3, D-4
Each technology has its characteristic weakness. An air-driven gyro fails gradually as the pump or filter degrades, and the instrument stays plausible while becoming wrong - the most dangerous kind of failure.
An electric spinning mass has no pump but still has bearings, so wear produces real drift. A ring laser gyro suffers lock-in at low rates, requiring dither. A fibre optic gyro is sensitive to temperature variation along the coil, which must be compensated.
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