Which option is not a common type of wire used in automotive applications?

• A. Coaxial
• B. Twisted pair
• C. Stranded
• D. Flex

Answer: (D)

Wires in automotive systems are categorized by how the conductor is built and what they’re used for. Coaxial cables are designed for high-frequency signals and shielding, making them ideal for antennas and RF paths. Twisted pair wires place two conductors together in a twisted arrangement to minimize EMI and are common for data networks like CAN or other communication lines. Stranded wires use many small strands to maximize flexibility and vibration resistance, which is essential for harnesses that flex with the vehicle’s movement.

The term “flex” isn’t a standard category of automotive wire. It describes how bendable a wire or cable might be, but it isn’t a recognized wire type like coaxial, twisted pair, or stranded. Automotive wiring relies on specific conductor configurations and insulation ratings, and “flex” doesn’t define a distinct, widely used class of wire.