District of Columbia DMV CDL Combination Quick Practice Test

District of Columbia DMV CDL Combination 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. The easiest way to recognize that your trailer has begun to skid is to:

Ask another driver.
Use your mirrors to determine if the trailer has left the lane.
Release the brake pedal and then push it down again.
Watch the jackknife warning light on the control panel.

2. If oil and water build up in your vehicle's air tanks, the brakes:

May not work correctly.
May feel squishy.
Will squeal loudly when used.
Will be extremely sensitive.

3. In a combination rig, it is best to make:

Quick, sudden stops.
Sharp turns.
Quick accelerations.
Slow, planned stops.

4. If a trailer begins to skid, it is best for the driver to:

Release the brakes.
Accelerate.
Quickly turn the steering wheel in one direction, then in the other.

5. If you are backing and become unsure about your path of travel, you should:

Continue backing.
Stop and get out to look.
Continue backing, but more slowly than before.

6. What happens when the wheels of a trailer lock up?

The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
The trailer will stop.

7. When driving while pulling trailers, you should:

Make sudden turns with the steering wheel.
Avoid making sudden moves.
Push the accelerator to the floor when starting from a stop.

8. A trolley valve:

Should be used while driving.
Should only be used to test trailer brakes.
Should be used when parking uphill.

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