🔍 Key Concepts

• Carefully count how many separate synchro units are shown in figure C and decide which is the transmitter and which are the receivers/indicators. • Look at the terminal labels inside each unit: S1, S2, S3 versus R1, R2 and how many of each there are. • Decide which winding (stator or rotor) has three leads in a wye (Y) connection and which has two leads.

💭 Think About

• How many devices in figure C are sending a signal, and how many are only displaying that signal? Match that to "transmitter" and "receiver" in the answer choices. • In each device, which winding is connected in common to all the others through three lines (S1, S2, S3), and which winding only has two external connections (R1, R2)? • Do you see one set of S1-S2-S3 feeding multiple remote units, or multiple sets of S1-S2-S3 feeding one unit?

✅ Before You Answer

• Verify whether there is one transmitter and two receivers or two transmitters and one receiver by reading the titles over each dashed box. • Confirm that each unit shows one rotor winding (R1–R2 only) and three stator leads (S1–S2–S3) tied together between units. • Check that the three S-leads from the transmitter are commoned to the three S-leads of each indicator, which is characteristic of a synchronous transmission system with shared stator connections.