What is a String Circuit?

• A. A circuit that consists of a series of telephone station jack boxes connected in parallel to a common line.
• B. A circuit that uses wireless connections between stations.
• C. A circuit made of a single wire loop.
• D. A circuit with multiple independent power supplies.

Answer: (A)

The idea being tested is how a string circuit is wired: many telephone station jack boxes are connected along a single pair of conductors that run as the common line, with each station tapping into that line in parallel. In this setup, all stations share the same two wires, forming a “string” of jacks along the line. This allows multiple stations to be placed along the same circuit without needing separate lines for each, and signals are carried along the common line to any station connected to it. It’s not a wireless setup, nor a single-wire loop, nor a configuration with multiple independent power supplies for each station.