FREE South Carolina CDL Doubles Triples Practice Test (2024)

1. If you hear a loud loud "bang" and the steering feels "heavy", you should:

check your rearview mirrors to see if you have a flat tire.
pump the brakes until the vehicle has slowed down.
brake hard and pull off the road.
hold the steering wheel firmly and stay off the brake.

2. The ABS malfunction lamp on the instrument panel is:

3. When you discover a fire, if the trailer doors are hot you should not open them because:

the temperature of the trailer should not be changed in any way.
with air many fires do less damage.
you should use the fire extinguisher on the door.
opening the doors lets air in and may make the fire flare up.

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

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

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

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

6. An item that is 15 feet long placed on a flatbed trailer should have at least:

7. Which of the following is a common cause of truck fires?

Short circuits due to loose connections.
Under-inflated tires and duals that touch.
loose fuel connections.
All of the above.

8. The maximum amount of play in a 20-inch steering wheel is:

9. To know if your vehicle is equipped with ABS, look for:

a yellow ABS malfunction lamps on the instrument panel.
the ABS logo on the steering wheel.
an ABS placard.
the ABS shipping paper.

10. Texting is:

safer than engaging in conversation with a passenger.
safer than talking on a cell phone.
the most dangerous distraction.
about as safe as adjusting the radio.

SOUTH CAROLINA CDL DOUBLES TRIPLES PRACTICE TEST