District of Columbia DMV CDL Doubles / Triples Quick Practice Test

District of Columbia DMV CDL Doubles / Triples Quick Practice Test For 2024

CDL Class A, B or C. Complete CDL driver training course. All the questions in this test are from the official DMV written exam. You can use our free online tests to evaluate how likely you are to pass the official DMV test. Or you can just cut to the chase and increase your chances of passing by upgrading to Premium Membership and unlock official DMV tests. In addition, you will also receive a master cheat sheet which contains all your state’s DMV questions and answers. Premium membership also unlocks a smart tracker which keeps an inventory of all incorrectly answered questions for easy, fast and effective revision. Practice with our free tests or hit Upgrade button below for premium access and increase your chances of passing your DMV written exam.

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Quick Facts:

Number of Questions – 20

Passing Percentage – 80%

Test Type – Free Test

1. A vehicle stopped at a green light may indicate that the driver:

Is impaired.
Is colorblind.
Does not know the rules of the road.
Is very patient.

2. What do anti-lock brakes do?

Help a driver avoid wheel lockup
Lock up the front wheels
Prevent a vehicle from accelerating while traveling uphill
Prevent a vehicle from accelerating while traveling downhill

3. Which of the following is an indication of standing water on the roadway?

Tire splashes
Portions of the pavement that are dry
Leaves on the road

4. If you doubt that you have enough space to safely drive under a bridge or sign, you should:

Drive faster.
Drive more slowly.
Drive on the shoulder.

5. Why do you need to drain air tanks regularly?

Because the air gets old and needs to be replaced
Because compressed air contains some water which must be drained from the tanks
To allow for a change in air pressure
To remove bad air from the tanks

6. If hydraulic brakes fail, a driver can reduce their speed by:

Shifting into a higher gear.
Shifting into a lower gear.
Finding a hill.
Letting the truck run out of gas.

7. The “crack-the-whip” effect for doubles and triples is:

Not a problem.
Only a problem when it's raining.
A serious concern.

8. Rolling backward when beginning to accelerate is dangerous because:

The transmission may be damaged.
The truck is not made to go backwards.
You may hit a vehicle behind you.

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