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Louisiana CDL Permit Test - Double

Number of questions: 20
Passing score: 16
Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has three possible answer choices. Test questions come from the Louisiana Commercial Driver License Manual. Questions come from chapters covering: Transporting Cargo, Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
You have made error so far
Passing grade —
4 or fewer errors
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1.
A poor balance of weight in a trailer:
Can make handling unsafe.
Improves traction.
Increases fuel efficiency.
2.
When backing a trailer, you must turn the steering wheel:
In the direction you want the trailer to move.
In the direction opposite of where you want the trailer to move.
To the left until backing is complete.
3.
When should the trailer hand valve be used?
Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
4.
Rearward amplification refers to:
The amount of noise projected to the rear of the vehicle.
The cause of the "crack-the-whip" effect.
The number of trailers that can be pulled by one tractor.
5.
If you are backing and the trailer begins to drift off-course, the driver should:
Return the steering wheel to the 12 o’clock position.
Turn the top of the steering wheel in the direction of the drift.
Turn the top of the steering wheel in the direction opposite of the drift.
6.
To prevent a trailer from rolling over while turning, you should:
Decelerate before the turn.
Accelerate before the turn.
Drive in the left lane.
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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