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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Louisiana CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Louisiana CDL Manual. Take this practice test now to prepare for the actual LA CDL combination test!
1. Air brakes:
are prohibited on larger vehicles.
are an effective way to stop large and heavy vehicles.
should be used only when driving on wet roads.
can improve fuel efficiency.
2. Containerized loads:
should exceed gross weight and axle weight limits.
must be inspected before and after the trip.
are generally used for freight carried part way by rail or ship.
All of the above.
3. _________ rigs are much more likely to roll over in an accident than _________ rigs.
Empty ; overloaded
Fully loaded ; overloaded
Fully loaded ; empty
Empty ; fully loaded
4. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
the trailer is overloaded.
the trailer is empty or lightly loaded.
the trailer is fully loaded.
None of the above.
5. Blocking and bracing are:
driving techniques used to regain control when your drive wheels start to skid.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
used to keep cargo from sliding and to prevent movement of cargo.
None of the above.
6. If your trailer starts to skid, you should:
use the trailer hand brake (if you have one) to straighten out the rig.
keep the rear of your vehicle close to the curb.
release the brakes to get traction back.
accelerate slightly.
7. When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
three times more likely
ten times more likely
five times more likely
less likely
8. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
go slowly around turns.
make sure that the release arm is in the engaged position.
keep the vents clear so they work correctly.
keep an eye on your tires.
9. To prevent rollover, drivers of combination vehicles should:
brake while turning.
make sure the cargo is not centered and spread out.
keep the cargo as close to the ground as possible.
keep the load is to one side.
10. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the parking brakes are on and your vehicle is safe to drive.
cargo is properly blocked.
the parking brakes are on and the wheels are chocked.
the coupling is not right and you should not drive until you get it fixed.
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LA CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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