A Synchro System is a servo motor slaved to another motor, thus both move synchronously and Answer A. is the right one.

Answer B. is wrong because a servo system is not necessarily synchoronous.

Answer C. is a.k.a. a Stepper Motor and stepper motors are not necessarily synchronous.

Answer D. is the distractor for this question.

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What is the most common type of antenna position indicating device used in modern RADARs?

Resolvers.

A resolver in a RADAR system is a type of electrical device used to determine the angular position of a rotating antenna. It's commonly utilized in antenna positioning systems to accurately measure the azimuth or elevation angle of the radar antenna. Resolvers are often employed in tracking or scanning radar systems where the antenna needs to be precisely aimed at different angles to cover specific areas or track moving targets.

Resolvers work based on electromagnetic principles, where the relative angles between coils and magnetic fields are used to determine the angle of rotation. The resolver's output provides analog signals that correspond to the angular position of the antenna, allowing the radar system to accurately direct its beam and gather information from different directions.

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