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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In a basic synchro system, angular information is carried on the stator lines because the voltage induced across the stator windings is directly proportional to the angle of the rotor relative to the stator, meaning the electrical signal on the stator lines represents the shaft position of the transmitter synchro, effectively transmitting the angular information. Key points to understand this:

Rotor excitation:
The synchro operates by applying an AC voltage to the rotor winding, which acts as a rotating magnetic field. 

Stator windings: The stator has three windings spaced 120 degrees apart, which pick up the varying magnetic flux produced by the rotating rotor depending on its angle. Voltage output: The voltage induced on each stator winding is proportional to the cosine of the angle between the rotor axis and the stator winding axis. Angle representation: By comparing the voltages across different pairs of stator lines, the system can determine the exact angular position of the rotor.

Therefore, the electrical signal on the stator lines represents the angular information from the transmitter synchro, which can then be used by a receiver synchro to align its own rotor to the same position.

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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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In a radar system, the antenna direction is sent to the display by using a specialized encoder, typically a "resolver" or "optical encoder," which is attached to the rotating antenna and continuously transmits the antenna's angular position as a digital signal to the processing unit, allowing the display to accurately depict the direction of the radar beam at any given time.

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