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Drivers who want to drive combination vehicles must pass the combination vehicles test. The District of Columbia 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 District of Columbia CDL Manual. Take this practice test now to prepare for the actual DC CDL combination test!
1. If a load is 50 feet long, the minimum number of tie-downs required is:
2. When you are driving on a slippery road, you should NOT:
adjust turning and braking to road conditions.
use the engine brake or speed retarder.
take curves at slower speeds.
keep a longer following distance.
3. Most heavy trucks with manual transmissions require ____ to change gears.
double clutching
triple clutching
single clutching
None of the above.
4. If your vehicle gets stuck on the railroad tracks, you should:
gather up your paperwork and shipping papers while calling 911, then get out of the vehicle.
check for identifiable landmarks to give the location of the crossing.
get out of your vehicle and away from the tracks.
All of the above.
5. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep an eye on your tires.
go slowly around turns.
make sure that the release arm is in the engaged position.
keep the vents clear so they work correctly.
6. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
The front trailer is twice as likely to turn over as the tractor.
None of the above.
7. How many red reflective triangles should you carry?
8. If a vehicle is equipped with ABS, when you start the engine:
the trailer emergency brakes will come on.
the wheels will lock up.
the spring brakes will come on.
the ABS indicator light on the dash should come on and then turn off.
9. When inspecting the cargo, make sure it is:
piled up.
not overloaded.
secured properly for the first 50 miles after beginning a trip.
All of the above.
10. If you will be transporting hazardous materials that require placards, you must:
ask permission of the local transportation agency.
obtain a hazardous materials endorsement.
transport the materials at night only.
obtain a special transit permit.
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DC Combination Test

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