CSLB Fire Protection (C-16): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Fire Protection (C-16) license exam, delivered online and graded instantly. Per the state's classification, a C-16 contractor installs, repairs, and services fire protection systems including sprinkler systems, standpipes, fire pumps, and underground mains. Works on any device, including iPad. See the official CSLB C16 classification.

Updated July 2026 · 2022 CA Codes · 440 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 440 practice questions
• Organized By: CSLB study-guide topic categories
• Includes: This practice exam has been updated using Peerless’s vetted usable question set. Questions are organized by CSLB study-guide topic categories and include answer explanations to support full-exam review and focused topic practice. Each topic has a mini-exam to help you develop mastery.

Sample questions — Try our free practice test

1. What chemical can be used to stop a small leak in a sprinkler system during a hydrostatic test?
   A. Sodium silicate · B. Sodium derivatives · C. Brine · ✓ D. You should not use anything
2. For what is the Hazen-Williams Formula used?
   A. Fire pump efficiency · B. Flow · ✓ C. Pressure loss · D. Velocity
3. An electrical contractor uses the underground mains and sprinkler mains as an electrical ground. He has proceeded:
   A. correctly · B. incorrectly; only above-ground mains may be used for grounding · C. incorrectly; only sprinkler mains may be used · ✓ D. incorrectly; such mains must never be used as a ground because it may cause electrolysis
4. What is the minimum size of a U-hook rod required for pipe from 2-1/2" in diameter?
   A. 1/4 in · ✓ B. 3/8 in · C. 1/2 in · D. 5/8 in
5. The Fire Protection contractor must perform all required acceptance tests and complete the Contractor's Material and Test Certificate for an installation:
   A. after asking for approval by the authority having jurisdiction · ✓ B. before asking for approval by the authority having jurisdiction · C. whenever the owner requests it · D. even though it's not his responsibility