FREE South Carolina Combination Practice Test (2023)

1. If you must make an emergency stop, you should:

apply the brakes as hard as you can to lock them.
brake in a way that will keep your vehicle in a straight line.
use the hand brake before the brake pedal.
None of the above.

2. 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.
make sure that the release arm is in the engaged position.
keep an eye on your tires.
go slowly around turns.

3. When approaching a stopped bus, you must be aware that:

a student may be driving the bus.
passing a stopped bus is illegal.
passengers may cross in front of or behind the bus.
passengers crossing in front of the bus can always see you.

4. Before connecting the converter dolly to the rear trailer, make sure that:

the shut-off valves at the rear of the first trailer are open.
the locking jaws rest on the kingpin.
the trailer height is slightly lower than the center of the fifth-wheel.
the kingpin rests on the fifth-wheel.

5. What is the minimum tread depth for tires other than front tires?

6. _________ can make vehicle handling unsafe.

7. Which of the following is NOT a step in backing up with a trailer?

Checking the outside mirrors on both sides frequently
Looking at your line of travel before you begin
Backing slowly
Backing quickly when the path is straight

8. When uncoupling, after you unlock the fifth-wheel you should:

pull the tractor clear of the trailer.
chock the trailer wheels.
ease the pressure on the locking jaws.
pull the tractor partially clear of the trailer.

9. Brake fade results from, and is affected by:

excessive heat caused by not relying on the engine braking effect.
excessive heat caused by using the brakes too much.
brakes out of adjustment.
All of the above.

10. When going down grades, you should:

shift up.
downshift to a lower gear.
put the transmission in Neutral.
rely solely on engine braking to reduce your speed.

CDL COMBINATION PRACTICE TEST SOUTH CAROLINA