Knowledge Test Class A #2
Class A Driving Test | District Of Columbia 2024 #2 Page 6 of 7
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 2024, 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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36 . When should you check and adjust your mirrors?
Mirrors do not need to be adjusted.
The adjustment of mirrors must be checked prior to the start of any trip.
37 . 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.
38 . When a construction worker is close to the road, you should:
Wait until the construction is complete before proceeding.
In work zones, you should drive at the posted speed limits. Reduce your speed even further when workers are on or near the road.
39 . To prevent fatigue while driving, you should:
Close the vents.
A hot, poorly-ventilated area can make a person sleepy. Opening a window, opening a vent, or using the air conditioning can help keep the cab cool and reduce the risk of fatigue.
40 . 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.
41 . While driving, you should:
Focus on your own driving and not worry about other drivers.
While driving, you should consistently check the road ahead for hazards. Develop a plan to deal with any hazards that could arise.
42 . When carrying a wide load, you should:
Drive on the shoulder.
