CDL Doubles/Triples Test (2024) - FREE DC CDL Practice Test

1. If there is a fire in your vehicle, do NOT:

park in an open area.
pull into a service station.
park away from buildings and other vehicles.
notify emergency services.

2. Alcohol:

does not affect judgement.
improves reaction time.
impairs depth perception.
improves muscle coordination.

3. "Bobtail" tractors are:

tractors with a tank.
heavily loaded trailers.
tractors without semitrailers.
tractors with two trailers.

4. You hear a loud "bang" which sounds like a tire blowout. You should:

assume you have a tire failure.
inspect your tires with your mirrors.
keep driving as normal.
check the tires at the next stop.

5. Under a pressurized system, the radiator cap:

should never be hot.
should be removed when the coolant is hot.
should always be cool.
should never be removed until the system has cooled.

6. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.

7. At dawn, dusk, in rain or snow, to make yourself easier to see you should:

8. If you are caught in strong winds, you should:

keep a strong grip on the steering wheel and slow down or pull off the roadway.
immediately take your foot off the accelerator.
speed up while keeping a strong grip on the steering wheel.
None of the above.

9. The trailer hand valve should be used:

to test the trailer brakes.
to check that the trailer is locked onto the tractor.
to check that the fire extinguisher is charged.
to check that the trailer emergency brakes are on.

10. Air brakes use ________ to make the brakes work.

CDL DOUBLES PRACTICE TEST DISTRICT OF COLUMBIA