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South Carolina CDL Practice Test: Double and Triples - Test 5 2018

(From the 2018 South Carolina CDL Handbook)
Number of tests: 5
Number of questions: 30
Passing score: 80

Directions: To obtain this endorsement for pulling two or three trailers, applicants must pass a 15-question test. And to pass the test, applicants must score at least 80%. Test questions are from the South Carolina Commercial Driver Handbook. The Double/Triple trailers endorsement can be used with the Class A CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at South Carolina DMV locations.

You have made 2 errors so far.
1. The pressure in the service line indicates ______.
  • You must stop ahead.

  • There is a traffic signal ahead.

  • Speeding is not allowed.

  • Continue at your current speed.

2. When the emergency line loses pressure ______.
  • Your headlights

  • Hand signals

  • Your emergency flashers

  • Your horn

3. If you are pulling triple trailers where should you position the heaviest trailer?
  • None of the above.

  • 30 feet from a railroad crossing.

  • Between a safety zone and the curb.

  • In a tunnel.

4. Which of the following is a necessary step to ensure that you have the best control of your double or triple on a curve?
  • As you drive faster, your tires become less effective

  • Deeper water is less dangerous

  • As you decrease your speed, the roadway becomes more slippery

  • Water does not affect cars with good tires

5. Why should you keep the fifth wheel plate lubricated?
  • No stopping.

  • No left turn.

  • Detour ahead.

  • No U-turn.

6. Automatic slack adjusters ________.
  • Church crossing.

  • School crossing.

  • Pedestrian crossing.

  • Pedestrian traffic only.