FREE OK CDL Doubles Triples Practice Test (2024)

1. With a dual air brake system:

each system shares the same lines and hoses.
each system has its own air tanks, hoses and lines.
each system shares air tanks.

2. The minimum amount of tread for rear tires is:

3. Doubles/triples are:

easier to drive than other CMVs.
usually faster than most CMVs.
less stable than other CMVs.

4. Combination vehicles have __ air lines.

5. Headache racks:

can blind other drivers.
help you keep weights within legal limits.
protect you from being hit by your cargo.

6. You are more at risk of being fatigued:

after getting more than 8 hours of sleep.
when stopping periodically during long trips.
when driving alone.

7. The application pressure gauge:

tells you how much pressure is in the air tanks.
shows how much air pressure is being applied to the brakes.
protects the tank and the rest of the system from too much pressure.

8. Before each trip, you must make sure:

the cargo is balanced and secured.
your cargo obscures your view to the sides.
the cargo has a high center of gravity.

9. Which of the following road surfaces freezes first?

10. When driving a 60-foot truck at 50 mph, your minimum following distance should be:

OKLAHOMA DOUBLES TRIPLES PRACTICE CDL TEST