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California CDL Permit Test - Combination

Number of questions: 20
Passing score: 17
Directions: All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the California Commercial Driver Handbook. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 17 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
You have made error so far
Passing grade —
3 or fewer errors
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
A loss of air pressure in the emergency line will cause:
The suspension springs to extend.
The tractor protection valve to open.
The emergency brakes to activate.
In a sudden turn, the ____ trailer is the most likely to turn over.
How much space should be between the upper and lower fifth wheel?
About five inches of space
A maximum of two inches of space
No space
After completing a pre-trip inspection, you should ensure that the:
Service line valve is closed.
Trailer hand brake is applied.
Emergency line valve is open.
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
Level with
Slightly higher than
Slightly lower than
An air supply control lever should be in its "normal" position when you are:
Changing a tire.
Applying the trailer emergency brakes.
Pulling a trailer.
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