Which option is not a listed relay code?

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Study for the Signal Maintainer Test. Practice with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which option is not a listed relay code?

Explanation:
Relay codes are standardized three-letter abbreviations used on diagrams and maintenance records to identify specific relay types or functions. Being able to distinguish codes that actually appear in the official list helps you spot non-listed options quickly. RLP and RWK are part of the recognized relay-code catalog, as is RN, which means they are valid, listed codes. RVD, on the other hand, does not appear in the official catalog of listed relay codes, so it’s the one that isn’t a listed code. To solve this kind of item, compare each option to the official code table and pick the one that isn’t present.

Relay codes are standardized three-letter abbreviations used on diagrams and maintenance records to identify specific relay types or functions. Being able to distinguish codes that actually appear in the official list helps you spot non-listed options quickly.

RLP and RWK are part of the recognized relay-code catalog, as is RN, which means they are valid, listed codes. RVD, on the other hand, does not appear in the official catalog of listed relay codes, so it’s the one that isn’t a listed code. To solve this kind of item, compare each option to the official code table and pick the one that isn’t present.

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