CDL Combination Test (2024) - FREE Connecticut Practice Test

1. To test the service brake:

shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
gently try to pull forward with the trailer parking brake on, then release the brake.
push the brake pedal firmly while going about 5 mph.
push the brake pedal firmly while slowly moving backward.

2. You should use chocks when parking a trailer without spring brakes because:

it helps prevent skids.
it is required by law.
the brakes will hold only as long as there is air pressure in the trailer air tank.
it helps prevent brake failure.

3. Having ABS on only the trailer:

still gives you more control over your vehicle during braking.
makes the trailer more likely to roll over.
is very dangerous.
makes the trailer more likely to swing out.

4. When checking the lights before driving:

you should turn off the engine.
you should check them from inside the vehicle.
the engine must be running.
make sure the parking brake is not set.

5. When driving trucks with trailers, drivers should:

avoid making sudden movements with the steering wheel.
decrease their following distance.
push the brake pedal to the floor when braking.
make quick lane changes.

6. Which of the following trailers can get stuck on raised crossings?

7. To be in the proper position for coupling, the fifth wheel should:

be level with the ground.
tilted up towards the rear of the tractor.
have its jaws closed around the shank of the kingpin.
be tilted down towards the rear of the tractor.

8. Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:

use only the braking force necessary to stop safely.
drive slower to keep your vehicle in a straight line.
monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.

9. To unlock the fifth wheel, pull the release handle to the _______ position.

10. If ABS is not working:

you should use the parking brake.
you will still have brakes.
you will not have any brakes.
you should use the emergency brake.

COMBINATION PRACTICE TEST - CT CDL