@paco
Thanks
I re read the question again and I think the question is asking about the gyroscope used rather than the turn indicator itself
Here is an answer I got courtesy of the theflyingengineer.com
Definition: "A turn indicator is based on the ability of a gyroscope with two degrees of freedom to superpose the angular velocity vector of the gyroscopic rotor’s own spin and the angular velocity vector of the rotation of the device’s case.". The rotation of the gyro about its own axis constitutes one degree of freedom. And the rotation about the longitudinal axis is the second.
And while we are at it , can someone please tell me what the Volare Question bank is about ?
Is it some official JAA question bank ? Does it use CQB 14 or 15 ?