FL CDL Combination Practice Test (2024)

1. The first thing to do when coupling a tractor-semitrailer is to:

2. When should you use the hand valve to park a combination vehicle?

3. When backing a trailer, you should:

never make pull-ups to reposition your vehicle.
turn the steering wheel in the direction you want to go.
avoid correcting the drift.
try to position your vehicle so you can back in a straight line.

4. If a load is 50 feet long, the minimum number of tie-downs required is:

5. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:

cargo is properly blocked.
the parking brakes are on and the wheels are chocked.
the parking brakes are on and your vehicle is safe to drive.
the coupling is not right and you should not drive until you get it fixed.

6. You have uncoupled a trailer and want to inspect the landing gear. The tractor should be positioned:

with the tractor frame under the trailer.
with the tractor frame above the trailer.
completely clear of the trailer.
None of the above.

7. Which of the following is most likely to roll over?

The middle trailer of a triple
The front trailer of a double
The rear trailer of a double
The rear trailer of a triple

8. If the ABS is not working:

the vehicle will have weak brakes.
you still have normal brake functions.
the vehicle will have no brakes.
None of the above.

9. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:

10. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?

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.
You may not notice a major leak in the service line until you try to put the brakes on.
None of the above.

CDL COMBINATION PRACTICE TEST (FL)