FREE NC CDL Combination Test - Practice Test 2024

1. Dollies with ABS are required to have a malfunction lamp:

2. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:

keep from rolling back.
reduce the chance of the front wheels skidding.
prevent movement of cargo.
hold compressed air.

3. Before leaving your vehicle unattended, you should:

4. If you smell exhaust fumes in the cab, you should:

wait for the next stop, then inspect your vehicle.
stop immediately.
open the windows.
remember to conduct a post-trip inspection.

5. Under a pressurized system, the radiator cap:

should always be cool.
should never be hot.
should be removed when the coolant is hot.
should never be removed until the system has cooled.

6. What is the proper following distance for a 50 foot truck traveling at 50 mph?

7. Blocking _______________ to keep it from sliding.

is used in the front, back, and/or sides of a piece of cargo
goes from the upper part of the cargo to the floor
is used only in the back of a piece of cargo
None of the above.

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

Checking that it is properly greased
Testing the tractor protection valve
Checking that the slide is not damaged or parts are missing
Checking that all locking pins are present and locked in place

9. Axle weight is:

the weight of all the axles added together.
the maximum safe weight your tires can carry at a specified pressure.
the value specified by the manufacturer as the loaded weight of one axle.
the weight transmitted to the ground by one axle or one set of axles.

10. When backing a truck you should:

look straight ahead.
always rely on your mirrors.
back and turn toward the right side.
get out and walk around the vehicle before you begin to back.

NORTH CAROLINA CDL COMBINATION PRACTICE TEST