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South Carolina CDL Practice Test: Class A - Test 7 2019

(From the 2019 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. 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

  • Require less time to pass on a downgrade than cars

  • Take longer distances than cars to stop

2. It's important that a warning signal comes on before the air pressure in the tank falls below _______.
  • Show current local road conditions.

  • Test future traffic signal needs.

  • Keep traffic flowing smoothly.

  • Assure pedestrian safety.

3. 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

  • Fluctuate your speed to keep alert

  • Drive with the flow of traffic

4. The emergency brakes will come on __________.
  • 30

  • 15

  • 90

  • 60

5. To test the trailer emergency brakes you need to first ______.
  • No stopping or standing.

  • No parking here to the corner.

  • No parking anytime.

  • Disabled parking spot.

6. What is the device that connects the service and emergency air lines from the truck to the trailer?
  • You may only drive straight ahead.

  • You must wait for a green light.

  • Vehicles moving in any direction must stop.

  • You may drive only in the direction of the green arrow.