Which code corresponds to the 'Reverse switch correspondence diagram light relay'?

• A. RFK
• B. RVP
• C. RWC
• D. RWK

Answer: (D)

These three-letter codes are shorthand used to label specific signaling diagrams in maintenance practice. Each position in the code corresponds to a part of the diagram’s description, so you can decode what the diagram shows just from the code.

For the phrase “Reverse switch correspondence diagram light relay,” the code that lines up with that combination is RWK. The first letter signals Reverse, the middle letter signals Switch, and the final letter indicates the light-relay aspect, matching the description exactly. This makes it the best match among the options. The other codes correspond to different diagram types and do not describe this particular arrangement.