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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Texas 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 Texas CDL Manual. Take this practice test now to prepare for the actual TX CDL combination test!
1. When you get ready to back under the semi-trailer, you should:
line up about 15 degrees off the line of the trailer.
line up the kingpin to engage the driver's side locking jaw first.
line up directly in front of the trailer.
back under the trailer at an angle to avoid pushing the trailer sideways.
2. If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
piled up high with heavy cargo on top.
centered and spread out as much as possible.
loaded so there is a high center of gravity.
to one side and as close to the ground as possible.
3. If are being followed closely, you should:
increase your following distance.
flash your brake lights.
decrease your following distance.
change lanes quickly.
4. What is a pull up when referring to truck driving?
Using the speedometer to know when to shift up.
A specific maneuver used to decelerate smoothly in the exit lane.
When a driver stops and pulls forward to get a better position.
A driving maneuver used to pull your vehicle over to the side of the road and stop.
5. If your vehicle catches fire, you should pull over:
near other vehicles.
in an open area.
near trees.
at a service station.
6. If a load is 50 feet long, the minimum number of tie-downs required is:
7. A burning tire must be:
covered with cloth.
cooled with water.
immediately removed from the vehicle.
None of the above.
8. A red triangle with an orange center means:
Law enforcement vehicle
Liquid tanker
The vehicle is hauling hazardous materials
Slow-moving vehicle
9. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the tractor will lose all air pressure.
the engine will shut down.
the trailer emergency brakes will come on.
the trailer supply valve will stay open.
10. The trailer hand valve should be used only:
to test the trailer brakes.
in driving to prevent skids.
when the trailer is fully loaded.
only in combination with the foot brake.
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TX CDL Combination Test

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