HI CDL Combination Practice Test (2024)

1. Most heavy-duty vehicles use:

2. Which of the following is NOT part of checking the sliding fifth-wheel?

Checking that all locking pins are present and locked in place
Checking that it is properly greased
Testing the tractor protection valve

3. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line causes:

the trailer spring brakes to come on.
the speed of your vehicle to increase.
the trailer emergency brakes to come on.

4. You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:

raised slightly off the ground.
fully lowered.
fully raised.

5. Longer combination vehicles have the tendency to swing wide on turns. This is called:

6. If you must drive slowly, how should you alert following drivers?

Use your emergency flashers if it is legal
Turn on your taillights
Flash your brake lights

7. If your truck catches fire, the first thing you should do is to:

pull off the road and park in an open area.
pull into a service station and call for help.
get the vehicle off the road and park near other vehicles.

8. Emergency brakes are:

9. Before entering an intersection, make sure that:

there is sufficient space to clear it.
accelerate smoothly and change gears as necessary.
there's enough room to get at least halfway across.

10. When you make a quick lane change, the crack-the-whip effect can:

turn the trailer over.
improve your traction.
make it harder to turn without skidding.

CDL COMBINATION PRACTICE TEST (HI)