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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Wisconsin 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 Wisconsin CDL Manual. Take this practice test now to prepare for the actual WI CDL combination test!
1. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
supply air to the trailer system and lock the trailer brakes.
begin raising the landing gear.
remove the wheel chocks.
connect the electrical cord and check the air lines.
2. The center of gravity of a trailer should be:
at the rear of the trailer.
as high as possible.
at the front of the trailer.
as low as possible.
3. Air brakes use ________ to make the brakes work.
compressed gases
compressed air
compressed gas cylinders
compressed oil
4. What is countersteering?
Locking your wheels while turning in an emergency situation.
Driving too fast for conditions.
Staying off the brake while steering to the right to avoid an accident.
Turning the steering wheel quickly the other way after steering in an emergency situation.
5. Empty trucks:
require the same stopping distance than full trucks.
require a shorter stopping distance than full trucks.
require a greater stopping distance than full trucks.
None of the above.
6. The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
the electrical and air connections are properly connected between the tractor and the trailer.
there is enough clearance between the top of the tractor tires and the nose of the trailer.
there is enough clearance between the rear of the tractor frame and the landing gear.
All of the above.
7. To reduce the chance of rollover, you should:
place the cargo as high as possible inside the trailer.
distributed the cargo as low as possible inside the trailer.
put the lightest parts of the cargo under the heaviest parts.
None of the above.
8. Most heavy-duty vehicles use:
solid brakes.
air brakes.
hydraulic brakes.
pressure brakes.
9. If an aggressive driver is involved in an accident down the road, you should:
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
try to get their vehicle to the side of the road.
make eye contact with the driver.
confront the aggressive driver.
10. The trailer hand valve should be used only:
in driving to prevent skids.
to test the trailer brakes.
when the trailer is fully loaded.
only in combination with the foot brake.
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WI CDL Combination Test

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