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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Tennessee 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 Tennessee CDL Manual. Take this practice test now to prepare for the actual TN CDL combination test!
1. When the ______ closes, it stops any air from going out of the tractor.
alcohol evaporator
hand valve
height control valve
tractor protection valve
2. Which of the following is NOT part of inspecting the coupling?
Checking that the locking lever is in the "lock" position
Checking for enough clearance between the rear of the tractor frame and the landing gear.
Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
Making sure there is no space between the upper and the lower fifth-wheel
3. When backing a trailer on a curved path you should back towards:
either side.
the driver's side.
the passenger's side.
neither side (back up straight).
4. 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.
The air could leak out of the trailer air tank, releasing its emergency brakes.
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.
None of the above.
5. Cargo tie-downs are used to:
keep cargo from shifting or falling.
prevent skidding.
prevent right-turn accidents.
prevent freezing.
6. Which of the following is NOT part of testing the trailer service brakes?
Checking for normal air pressure.
Pushing in the trailer air supply knob.
Releasing the parking brakes.
Moving the vehicle forward slowly.
7. If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
To prevent water and dirt from getting into the coupler and the air lines.
To prevent freezing of the washer liquid.
Because if you don't, you will never build system pressure.
To prevent overheating.
8. Before entering a curve, you should:
maintain your speed.
come to a complete stop.
increase your speed.
reduce your speed.
9. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
keep an eye on your tires.
go slowly around turns.
make sure that the release arm is in the engaged position.
10. If you let air out of hot tires:
air pressure will increases, causing the tires to blow out.
as the tire cools, the air pressure will be too low.
the tires will cool off much sooner.
None of the above.
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TN CDL Combination Test

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