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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Kansas 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 Kansas CDL Manual. Take this practice test now to prepare for the actual KS CDL combination test!
1. When more cargo is piled up in a truck, the center of gravity moves:
to the left side of the truck.
to the right side of the truck.
closer to the ground.
higher up from the road.
2. When driving at night you should:
always use low beams.
keep the interior light on.
use your high beams when it is safe and legal to do so.
All of the above.
3. Off-tracking is:
when the tires lose their contact with the road and have little or no traction.
when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
None of the above.
4. To prevent rollover, you should:
drive in the left lane.
drive slowly around corners.
turn the engine off while turning.
drive on the shoulder of the road when possible.
5. 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.
the parking brakes are on and the wheels are chocked.
cargo is properly blocked.
the coupling is not right and you should not drive until you get it fixed.
6. During a trip you need to inspect the cargo and its securing devices:
every 3 hours or 150 miles.
within the first 50 miles after beginning a trip.
after every break you take.
All of the above.
7. To prevent rollover, you should:
keep the cargo as close to the ground as possible.
drive slowly around on ramps and off ramps.
go slowly around turns.
All of the above.
8. In vehicles with air brajes, the tractor protection valve:
is used to connect the service and emergency air lines from the truck/tractor to the trailer.
carries air, which is controlled by the trailer hand brake or the foot brake.
provides the air pressure used to operate trailer brakes.
keeps air in the tractor or truck brake system.
9. What factors can cause brakes to fail or fade?
Not relying on the engine braking effect
Brakes out of adjustment
Excessive use of the service brakes
All of the above.
10. Tests have shown that trucks with a high center of gravity:
are less likely to roll over when entering a curve.
can roll over if the driver exceeds the posted speed limit for a curve.
can roll over if the driver slows down before entering a curve.
can roll over at the posted speed limit for a curve.
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KS CDL 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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