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South Carolina CDL Practice Test: Class A - Test 7 2018

(From the 2018 South Carolina CDL Handbook)
Number of tests: 7
Number of questions: 30
Passing score: 80

Directions: When applying for this license, applicants must pass a 50-question test. And applicants must score 80% to pass the test. The following questions are based on the details provided in the South Carolina Commercial Driver Handbook. Endorsements that may be used with a Class A CDL include Hazardous Materials, Passenger, Double and Triples, HazMat and Tanker, Air Brakes and School bus. 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. It's important that a warning signal comes on before the air pressure in the tank falls below _______.
  • Test future traffic signal needs.

  • Show current local road conditions.

  • Assure pedestrian safety.

  • Keep traffic flowing smoothly.

2. What is the device that connects the service and emergency air lines from the truck to the trailer?
  • You may drive only in the direction of the green arrow.

  • Vehicles moving in any direction must stop.

  • You may only drive straight ahead.

  • You must wait for a green light.

3. To test the trailer emergency brakes you need to first ______.
  • Disabled parking spot.

  • No parking anytime.

  • No stopping or standing.

  • No parking here to the corner.

4. When you are transporting cargo, you should inspect your cargo within the first ___ miles.
  • Drive faster than the flow of traffic

  • Drive slower than the flow of traffic

  • Drive with the flow of traffic

  • Fluctuate your speed to keep alert

5. The emergency brakes will come on __________.
  • 90

  • 15

  • 30

  • 60

6. What is the purpose of a front-end header board?
  • Require less time to pass on an incline than cars

  • Require less turning radius than cars

  • Take longer distances than cars to stop

  • Require less time to pass on a downgrade than cars