CSLB Solar (C-46): Online Practice Exam

What this exam covers

Practice questions for the California CSLB Solar (C-46) license exam, delivered online and graded instantly. Per the state's classification, a C-46 contractor installs, modifies, and repairs solar energy systems including photovoltaic panels, inverters, racking systems, and solar thermal equipment. Works on any device, including iPad. See the official CSLB C46 classification.

Updated July 2026 · 2022 CA Codes · 341 Questions · Topic Practice

• Content Last Updated: July 24, 2026
• Code Basis: 2022 California Codes
• Question Count: 341 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. This type of tank contains a flexible diaphragm with an air charge on one side and heat transfer fluid on the other.
   ✓ A. diaphragm · B. nondiaphragm · C. expanding expansion tank · D. closed nondiaphragm
2. Isolation valves should be placed at the following locations:
   A. one on either side of an external heat exchanger for servicing · B. one on each side of the screen ahead of a pressure regulator · C. one on each side of the circulator pump and strainer · ✓ D. all of the above
3. To determine the number of collectors needed, you should:
   A. divide total array output by collector output · ✓ B. divide collector output by total array output · C. total output x total array · D. none of the above
4. The total array output is 150,000 and the collector output is 22,3000. Determine the amount of collectors needed.
   A. 4 · ✓ B. 7 · C. 10 · D. 15
5. Conditions that will cause a pipe to burst are:
   A. magnitude of freezing temperatures · B. duration of freezing temperatures · C. size and type of freezing · ✓ D. all of the above