CDL PRACTICE TEST - GENERAL KNOWLEDGE (DISTRICT OF COLUMBIA)

21. Traction is:
friction between the tires and the road.
friction between the front and rear tires.
the maximum safe weight a tire can carry at a specified pressure.
the distance your vehicle will travel while you are braking.
22. To prevent drowsiness before a trip, you should:
drink 2 cups of coffee.
avoid driving with a passenger.
drive with the windows rolled down.
avoid medications that cause drowsiness.
23. Which of the following statements about overhead clearance is true?
If the road causes your vehicle to tilt, you should drive a little closer to the side of the road.
You should assume the heights posted at bridges and overpasses are correct.
The weight of a cargo van changes its height.
All of the above.
24. If the road is icy, you should:
reduce speed to a crawl and stop driving as soon as you can safely do so.
maintain your current speed and stop driving as soon as you can safely do so.
put the transmission in neutral and stay off the brake until the vehicle has slowed down, then pull off the road and stop.
All of the above.
25. If you are driving in fog, you should not:
use high beams.
slow down.
turn on the 4-way emergency flashers.
All of the above.
26. To warn drivers behind you that you will be slowing down, you should:
turn on the parking, clearance and side-marker lights.
tap your brake pedal a few times to flash your brake lights.
turn on the right and left turn signals at the same time.
turn on the 4-way emergency flashers.
27. Name two causes of tire fires.
Under-inflated tires and dual tires that touch
Excessive braking
Mismatched tires and road debris.
Driver smoking and poor ventilation.
28. When only the tractor has ABS:
there is less chance of jackknifing.
it will be much more difficult to maintain steering control.
the brakes won't work as effectively as without ABS.
there is an increased chance of jackknifing.
29. Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
Broken leaves in a multi-leaf spring.
Damaged air suspension systems.
Spring hangers that allow movement of axle from proper position.
All of the above.
30. If your brakes fail on a steep mountain downgrade, you should:
decide what to do as soon as you know your brakes do not work.
slow down until your vehicle comes to a complete stop.
stay on the road and keep looking for the next available escape ramp.
set the parking brake and park in an open area.
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