CDL Doubles Triples Practice Test (2024)

1. When you discover a fire, if the trailer doors are hot you should not open them because:

you should use the fire extinguisher on the door.
opening the doors lets air in and may make the fire flare up.
with air many fires do less damage.
the temperature of the trailer should not be changed in any way.

2. If the engine catches fire, you should:

turn off the engine as soon as you can.
open the hood as soon as you can.
avoid shooting foam from the vehicle's underside.
pull into a service station and notify the emergency services.

3. Air brakes:

should be used only when driving on wet roads.
can improve fuel efficiency.
are prohibited on larger vehicles.
are an effective way to stop large and heavy vehicles.

4. Which of the following is a common cause of truck fires?

Short circuits due to loose connections.
loose fuel connections.
Under-inflated tires and duals that touch.
All of the above.

5. You should test the coupling by:

pulling against the pin of the second semitrailer.
locking the pintle hook.
applying the parking brakes so the rig will not move.
disconnect the safety chains.

6. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.

7. Air pressure should build up in a single air system, within about:

8. Which of these describes the proper braking technique when driving on a long and steep downgrade?

Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
All of the above.

9. For safety during a trip, you should:

use your senses to check for problems.
watch gauges for signs of trouble.
check critical items when you stop.
All of the above.

10. When possible, you should park:

so you will have to back up when you leave.
on the roadway.
on the shoulder.
so you will be able to pull forward when you leave.

GA CDL DOUBLES TRIPLES PRACTICE TEST