SC CDL GENERAL KNOWLEDGE TEST - CDL PRACTICE TEST

21. Commercial motor vehicles:
are not required to have a fire extinguisher if they already have reflective warning triangles and other emergency equipment.
should have a properly charged and rated fire extinguisher and other emergency equipment.
are only required to have a fire extinguisher when transporting hazardous materials.
None of the above.
22. When driving on packed snow, you should reduce speed by:
10%.
25%.
one-third.
a half.
23. To prevent drowsiness before a trip, you should:
avoid medications that cause drowsiness.
drink 2 cups of coffee.
avoid driving with a passenger.
drive with the windows rolled down.
24. You must have at least ________ tread depth on tires other than front tires.
4/32 inch
2/32 inch
4/16 inch
8/32 inch
25. Hydroplaning is more likely if:
the road is wet.
tire pressure is low.
tire tread is worn.
All of the above.
26. When inspecting your windshield, you should look for:
dirt.
illegal stickers.
cracks.
All of the above.
27. Which of the following will help a drinker sober up?
Fresh air
Time
Drinking coffee
All of the above.
28. On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
the steeper the grade
the heavier the load
the longer the grade
All of the above.
29. For fire safety, the correct list of items you should check during your pre-trip inspection is:
fuel and fire extinguisher.
cargo, fuel, electrical and exhaust systems.
tires, cargo, fuel, electrical and exhaust systems, fire extinguisher.
cargo, fuel, steering wheel, electrical system, fire extinguisher.
30. When driving at night you should:
use your high beams when it is safe and legal to do so.
keep the interior light on.
always use low beams.
All of the above.
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