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Louisiana CDL Permit Test - Combination

Number of questions: 20
Passing score: 16
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 Commercial Driver License Manual. 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 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
You have made error so far
Passing grade —
4 or fewer errors
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1.
Rollovers happen when:
You drive too slowly.
You are stopped.
You take a turn too fast.
2.
Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Quicker
Easier
More difficult
3.
Shut-off valves:
Prevent air from escaping air brake systems.
Prevent air from entering air brake systems.
Override vehicles that are out of control.
4.
Before beginning a trip, you should:
Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
5.
Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
One second
Two seconds
Three seconds
6.
When glad hands are coupled, the seals should be pressed together at a ____ angle.
50-degree
180-degree
90-degree
7.
When driving with trailers, you should:
Make quick, sudden changes.
Avoid making sudden moves.
Accelerate by pushing the accelerator to the floor.
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