Discussion
Assertion (A): A gyroscope can serve as an attitude reference.
Reason (R): Its spin axis stays fixed relative to inertial space unless a torque acts on it.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the second is the property that makes the first possible. A spinning rotor holds its axis fixed in inertial space, so the aircraft can move around it while the gyro provides an unchanging datum.
The gimbals let the airframe rotate without applying torque to the rotor, and the display reads the angles between them. Everything else in the instrument - erection, gimbal limits, drift compensation - exists to preserve or correct that basic reference.
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