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California CDL Permit Test - Knowledge Test Class B

(From the 2021 California CDL driver handbook)

Number of questions:	50
Passing score:	40

Directions: 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.

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Passing grade —

10 or fewer errors

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When backing with a trailer, you should begin by:

Turning the steering wheel in the direction of the turn.
Turning the steering wheel in the direction opposite of the turn.
Turning the wheel as sharply as possible.

You may not consume alcohol within ____ of going on duty.

One hour
Two hours
Four hours

Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.

A tread depth of ____ should be in every major groove of a tire that is not in the front of a commercial motor vehicle.

1/32 of an inch
2/32 of an inch
4/32 of an inch

When backing with a trailer:

You should not back up in a straight line.
You should not correct drift until you are far off course.
You should frequently pull forward to reposition the vehicle.