Discussion
Match each sensor in List I with what it measures in List II.
List I
A. Rate gyro triad
B. Accelerometer triad
C. Magnetometer
D. Pitot tube
List II
1. Angular rate about three axes
2. Specific force along three axes
3. The direction of the earth's magnetic field
4. Total pressure, belonging to the air data system
Select the correct match.
Answer: B
Correct answer: A-1, B-2, C-3, D-4
Each sensor is matched to the quantity it senses. The rate gyro triad (A) measures angular rate about three axes (1); the accelerometer triad (B) measures specific force along three axes (2); the magnetometer (C) measures the direction of the earth's magnetic field (3).
The pitot tube (D) is the odd one out, measuring total pressure and belonging to the air data system (4) rather than to the inertial unit at all. The distractors mainly swap the gyro and accelerometer roles, which is the pairing to check first - rate against force.
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