CDL Doubles Triples Practice Test (2024)

1. If you are feeling sleepy, you should:

pull off the road and rest or take a nap.
increase your speed to get to the destination quicker.
slow down and drive on the shoulder of the road.

2. Which of the following statements about retarders is NOT correct?

Retarders help you avoid skids.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders help slow a vehicle, reducing the need for using brakes.

3. What happens when the center of gravity of a truck moves higher up from the road?

The vehicle is more stable while turning.
The truck becomes easier to turn over.
It is easier it is to turn around corners.

4. Which of the following is not proper tie-down equipment:

5. An ABS system:

requires a change in the way you brake.
helps increase a vehicle's stopping power.
is a safety anti-skid braking system.

6. The trailer hand valve should:

be used in driving.
never be used to test the trailer brakes.
never be used for parking.

7. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:

8. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.

9. When parked on the side of the road, you should:

use the 4-way emergency flashers.
flash your brake lights.
turn off all lights.

10. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:

AZ CDL DOUBLES TRIPLES PRACTICE TEST