20 Tests

CDL Class A Driving Test Online | District Of Columbia 2021

Train for FREE online with our District Of Columbia class A license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a DC CDL class A permit in 2021, practice as much as.. Read More

Train for FREE online with our District Of Columbia class A license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a DC CDL class A permit in 2021, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class A requirements may vary from state to state.

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1 . To ensure you do not interfere with traffic while driving a heavy vehicle, you should:

Ride the brakes while driving downhill. If the weight of your vehicle prevents you from matching the speed of surrounding traffic, you should stay in the right lane, if possible.

2 . If something is found to be unsafe during a pre-trip inspection, you should:

Not use the items found to be unsafe, but may continue driving normally. If a pre-trip inspection reveals anything unsafe about your vehicle, you must get it repaired. It is illegal to operate an unsafe vehicle.

3 . When driving through fog, a driver should:

Drive on the shoulder. If you must drive in fog, you should use your low beam headlights.

4 . You must put out emergency warning devices within ____ of stopping on the side of the road.

Two hours If you must stop on the shoulder of a road, put out your emergency warning devices within 10 minutes of stopping. When pulling off the road to stop, be sure to turn on your four-way emergency flashers.

5 . Which factor does not have an impact on a person’s blood alcohol concentration (BAC)?

The temperature of the drinks The three main factors that determine a person's blood alcohol concentration (BAC) are the amount of alcohol consumed, how quickly the alcohol is consumed, and the person's weight.

6 . Air brakes are:

A tool to improve fuel efficiency. As long as the brakes are properly maintained, using air brakes is a safe and effective method of stopping large, heavy vehicles.

7 . Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:

Driving uphill. Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure drops to an unsafe level, the parking brake valve should pop out and spring brakes should come on.

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