SOUTH CAROLINA CDL PRACTICE TEST - GENERAL KNOWLEDGE

11. The speed limit is 55 mph. Traffic is heavy, moving at 35 mph. What's the safest speed in this situation?
40 mph
45 mph
35 mph
25 mph
12. When driving, you should check your mirrors:
only when there may be a problem.
every 10 seconds.
regularly.
every 4 seconds.
13. It's very important to distribute the cargo so it is:
as low as possible.
in the centre of the load.
piled up.
as high up as possible.
14. Emergency brakes are:
not required on buses.
not required on commercial vehicles with air brakes.
not required on doubles.
required on all vehicles.
15. How do you put on the parking brake on newer vehicles?
By using a round yellow knob.
By pushing in Push in a diamond-shaped yellow knob.
By pulling out a diamond-shaped yellow knob.
By move a yellow lever to the left.
16. When you have to back, you should use a helper:
when you need to back on a curved path.
whenever possible.
only when you back up with a trailer.
only when backing toward the right side.
17. Which of the following is NOT a reason for hydraulic brake failure?
Stab braking
Brake fade on long hills
Loss of hydraulic pressure
All of the above.
18. When you push the brake pedal down, air brakes work:
only when ABS is working.
immediately.
after a short delay.
after about 15 seconds.
19. Broken suspension parts:
can be extremely dangerous.
hold up the vehicle and its load and keep the axles in place.
should not be a concern unless you are driving on steep grades.
All of the above.
20. Vehicle inspections:
are important because vehicle defects found during an inspection could save you problems later.
should be performed once a week.
should only be done when a vehicle defect is found.
should not be done by the shipper.
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