HVAC (C-20) Study Guide Book + Online Practice Exam

What’s included

• Learn the material: HVAC (C-20) Study Guide Book
• Pass the test: HVAC (C-20) Practice Exam

What this covers

Per the state's classification, a C-20 contractor installs, services, and repairs forced-air heating, ventilating, and air conditioning systems, including ductwork, equipment, and refrigeration components. This printed book covers the subjects the state tests. See the official CSLB C-20 classification.

Sample questions

1. In 1 ton of air conditioning there are how many Btu's per hour?
   A. 10,000 · B. 11,000 · ✓ C. 12,000 · D. 15,000
2. Two methods of evacuation are:
   A. Deep and purging · B. Deep and vapor · ✓ C. Deep and triple · D. Deep and surface
3. The mechanism that comprises both a service valve and a pressure gauge is a:
   A. Selenium · B. Charging pulse · ✓ C. Testing manifold · D. Transformer
4. A three pipe water system has which of the following?
   A. 1 return, 1 supply and 1 reserve · B. 1 supply, 2 returns · ✓ C. 2 supplies, 1 return · D. 2 returns, 2 supplies
5. A compressor in which compression is attained in a cylinder by rotation of a semiradial member is known as which of the following?
   A. Compressor · ✓ B. Rotary compressor · C. Hermetic compressor · D. Open type compressor
6. Which of the following describes series heating cooling circuits?
   A. Single circuits · ✓ B. Combination circuits · C. 3 way circuits · D. 4 way circuits