FREE South Carolina CDL Combination Test 2024 (Practice Test)

1. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:

the tractor will lose all air pressure.
the trailer emergency brakes will come on.
the trailer supply valve will stay open.
the engine will shut down.

2. The heavier the vehicle:

the less work the brakes must do to stop it.
the more work the brakes must do to stop it.
the higher the center of gravity will be.
None of the above.

3. A burning tire must be:

immediately removed from the vehicle.
covered with cloth.
cooled with water.
None of the above.

4. To prevent rollover, drivers of combination vehicles should:

make sure the cargo is not centered and spread out.
brake while turning.
keep the cargo as close to the ground as possible.
keep the load is to one side.

5. When backing with a trailer, you should:

check your mirrors on both sides frequently.
make pull-ups to re-position your vehicle as needed.
look at your line of travel before you begin backing.
All of the above.

6. Which of the following will NOT help you prevent rollover?

Driving slowly around turns.
Keeping the cargo as close to the ground as possible.
Using the controlled braking method.
All of the above.

7. ABS:

should only be used on dry roads.
is an addition to your normal brakes.
replaces your normal brakes.
allows you to brake harder.

8. Cargo tie-downs are used to:

keep cargo from shifting or falling.
prevent freezing.
prevent skidding.
prevent right-turn accidents.

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

10. Overloading a vehicle with cargo can have negative effects on all of the following except:

SC CDL COMBINATION TEST - PRACTICE TEST