Which of the following is a primary function of a receptacle face?

• A. Provide structural support
• B. Inhibit mis-mating of differently rated devices
• C. Contribute to electrical resistance
• D. Assist in heat dissipation

Answer: (B)

The receptacle face is designed to enforce correct pairing by keying the interface so only the matching plug (with the appropriate rating) can mate. This prevents mis-mating, which could lead to unsafe connections or equipment damage if different voltages or currents were accidentally connected. The face isn’t mainly about structural support—that role comes from how the receptacle is mounted in the enclosure. It also doesn’t determine electrical resistance, which depends on the conductor materials and geometry, nor is heat dissipation its primary job; those aspects are handled by the overall design of the contacts and cooling paths. So the best answer is that the receptacle face mainly inhibits mis-mating of differently rated devices.