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: Try our free practice test 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 Two methods of evacuation are:A. Deep and purging · B. Deep and vapor · ✓ C. Deep and triple · D. Deep and surface The mechanism that comprises both a service valve and a pressure gauge is a:A. Selenium · B. Charging pulse · ✓ C. Testing manifold · D. Transformer 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 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 Which of the following describes series heating cooling circuits?A. Single circuits · ✓ B. Combination circuits · C. 3 way circuits · D. 4 way circuits
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