Discussion
A synchro transmits angular position by
Answer: A
Correct answer: Inducing voltages in a stator
A synchro has a rotor winding excited with alternating current and three stator windings spaced at 120 degrees. The voltage induced in each stator depends on the angle between it and the rotor.
The set of three voltages therefore encodes the shaft angle uniquely, and connecting a matching receiver reproduces the angle at a distance without any digital conversion - which is why synchros were the standard means of transmitting position in earlier avionics. The output is absolute: the angle is known as soon as power is applied.
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