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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Oregon 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 Oregon CDL Manual. Take this practice test now to prepare for the actual OR CDL combination test!
1. When approaching a vehicle with a distracted driver, you should:
quickly pass the vehicle.
sound your horn.
maintain your safe following distance.
change lanes quickly.
2. Combination vehicles usually require _________ single commercial vehicles.
less driving skill than
more driving skill than
the same level of skill as
None of the above.
3. If the safety relief valve in the air brake system releases air:
the valve is fully operational.
this will supply more power to the drive wheels.
this will supply more power to the brakes.
something is wrong.
4. When inspecting the cargo, make sure it is:
piled up.
secured properly for the first 50 miles after beginning a trip.
not overloaded.
All of the above.
5. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
The letters "ABS" are printed on the side of the steering wheel.
Wheel speed sensor wires are coming from the back of the brakes.
It was built after March 1, 1998.
It has yellow ABS malfunction lamps.
6. When backing a tractor under a trailer, you should:
always use the lowest reverse gear.
back at an angle.
stop before when the kingpin is locked into the fifth wheel.
All of the above.
7. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
None of the above.
8. Containerized loads:
must be inspected before and after the trip.
are generally used for freight carried part way by rail or ship.
should exceed gross weight and axle weight limits.
All of the above.
9. The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
there is enough clearance between the rear of the tractor frame and the landing gear.
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.
All of the above.
10. What are the two basic reasons for covering cargo?
To protect people from spilled cargo and the cargo from pilferage.
To protect people from spilled cargo and the cargo from weather.
To protect the cargo from weather and to avoid littering.
To protect the cargo from pilferage and from weather.
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OR CDL Combination Test

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