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Telco-Admin Practice Quizzes

PRACTICE SETS

The 12 practice sets I built studying for the Washington Telecommunications (09) administrator exam — 359 questions on the NEC, RCW 19.28, WAC 296-46B, and general trade theory, each answer with its explanation. They are study aids, not the exam; the code books and the law are the authority.

The interactive quiz and the answer keys run with JavaScript.

HOW THE KEYS STAY SEALED

ANSWER KEYS: CIPHERTEXT ONLY, DECRYPTED IN THE BROWSER1 · QUIZ SETS12 sets · 359 questionsNEC · RCW 19.28WAC 296-46B · theory2 · BUILD-TIME ENCRYPTIONgenerate-answer-keys.mjsone password per setPBKDF2-SHA256 · 310,000 iter · AES-256-GCM3 · STATIC SITE SHIPSciphertext only/answer-keys/<slug>.jsonno plaintext key on the site4 · PASSWORD ENTRYcandidate enters theset passwordthat set's own password5 · BROWSER DECRYPTSWebCrypto decryptslocallykey derived in the browser only6 · CHECKED LOCALLYrunner checks answerson the pageHide clears the rendered keyPASSWORD IS NEVER STORED OR SENT — THE KEY NEVER LEAVES THE BROWSER
How a set's answer key stays sealed: encrypted per set when the site is built, shipped as ciphertext only, and opened in the candidate's browser — the password is never stored or sent.

ANSWER KEYS

Each set's answer key is encrypted, with its own password. Unlocking happens in your browser; the password and the key are never stored or sent anywhere.

General Trade Knowledge & Theory — Extended

30 questions

This answer key is encrypted; it opens with this set's password.

NEC Article 250 — Grounding & Bonding

30 questions

This answer key is encrypted; it opens with this set's password.

NEC Articles 300–398 — Wiring Methods

29 questions

This answer key is encrypted; it opens with this set's password.

NEC 2023 Articles 500–516 — Hazardous Locations Practice Test

30 questions

This answer key is encrypted; it opens with this set's password.

NEC 2023 Articles 705–770 — Special Conditions

30 questions

This answer key is encrypted; it opens with this set's password.

NEC 2023 Chapter 8 — Communications Systems Practice Test

30 questions

This answer key is encrypted; it opens with this set's password.

NEC 2023 Articles 90–110 — Introduction, Definitions, and General Requirements

30 questions

This answer key is encrypted; it opens with this set's password.

NEC 2023 + General Theory — Mixed Set 02

30 questions

This answer key is encrypted; it opens with this set's password.

WA Telecom Admin — Pretest A

30 questions

This answer key is encrypted; it opens with this set's password.

WA Telecom Admin — Pretest B

30 questions

This answer key is encrypted; it opens with this set's password.

RCW 19.28 — Electricians & Electrical Installations

30 questions

This answer key is encrypted; it opens with this set's password.

WAC 296-46B — WA Electrical Safety Standards

30 questions

This answer key is encrypted; it opens with this set's password.

REFERENCES

  1. Web Crypto API — W3C RecommendationThe browser API (crypto.subtle) the page uses to derive the key with PBKDF2 and decrypt each answer-key envelope locally with AES-GCM.
  2. NIST SP 800-38D — Galois/Counter Mode (GCM) and GMACThe NIST specification of AES-GCM, the authenticated-encryption mode sealing every answer-key envelope.
  3. NFPA 70 — National Electrical Code (NEC), NFPA catalog entryNFPA's own page for NFPA 70, the National Electrical Code the NEC quiz sets study; the code text itself is sold by NFPA, so this is the code's catalog entry.
  4. Washington RCW 19.28 — Electricians and Electrical InstallationsThe Washington statute the RCW 19.28 quiz set studies, from the Washington State Legislature's official code site.
  5. Washington WAC 296-46B — Electrical Safety Standards, Administration, and InstallationThe Washington administrative code chapter the WAC 296-46B quiz set studies, from the Washington State Legislature's official code site.