California cdl Class B Knowledge Test - 2
Number of questions: 50
Passing score: 80%
Acceptable number of errors: 10
This license is required for driving a single vehicle with a GVWR of more than 26,000 pounds, a 3-axle vehicle weighing over 6,000 pounds, a bus (except a trailer bus), with endorsement or any farm labor vehicle, with endorsement. To receive this license, applicants must pass a 50-question test. Each question has three answer choices. To pass, applicants must answer 40 questions correctly. Test questions come from the California Commercial Driver Handbook. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination Vehicles, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.
To DMV Handbooks15. Why should you regularly drain the air tanks?
Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure