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Alabama CDL DMV Knowledge Test Class B 1

Take 4 practice tests for CDL is the best way to prepare for your Alabama DMV exam is by taking our free practice tests. The following question are from real Alabama DMV practice test. More than 95% people pass a DMV exam when practice at DMV Practice Test.

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1. To make it as safe as possible to leave a stop, you should park:
So that you must back up to leave your parking space.
So that you can pull forward to leave your parking space.
On the side of a roadway, not in a parking lot.
By backing into a parking space.

Backing can be dangerous, so avoid doing it whenever you can. If possible, park in such a way that allows you to pull forward to exit your parking space.

2. If you are taking the driving test and the route does not include a railroad crossing, you:
Will not have to do anything related to a crossing.
May have to explain how you would cross railroad tracks.
Will have to take a different route.

During the on-road driving test, if your route does not include a railroad crossing, the examiner may ask you to explain and demonstrate the necessary procedures at a simulated location.

3. Having ABS on only one axle:
Can be dangerous.
Still allows you additional control when braking.
Slows the vehicle, but cannot stop it.

If you have an Anti-Lock Braking System (ABS) equipped on only the tractor, only the trailer, or only one axle, you will still have more control over the vehicle when braking than you would without ABS. You should brake normally.

4. Pre-trip inspections are:
Needed only for trips longer than 100 miles in length.
Required by law.

Federal and state laws require drivers to inspect their vehicles before every trip, regardless of length.

5. A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch

Before a trip, you should check each slack adjuster after parking, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure that they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.

6. A tread depth of ____ should be in every major groove of a front tire.
1/32 of an inch
2/32 of an inch
4/32 of an inch

For safe operation, a commercial motor vehicle needs a tread depth of 4/32 of an inch in every major groove on the front tires, and a tread depth of 2/32 of an inch on other tires.

7. Leaking shock absorbers:
Are normal.
Indicate a potentially dangerous defect.
Will prevent the turn signals from working.
Pose no threat if the vehicle is only driven on highways.

The suspension system keeps a vehicle's axles in place. Damaged suspension parts, such as leaking shock absorbers, may be potentially dangerous defects on a vehicle.

8. A fatigued driver:
Is extra alert.
Should take over-the-counter remedies to wake them up.
May make critical decisions too slowly.
Is usually more conscientious than a typical driver.

If you are fatigued, you will not see or react to hazards as quickly as you would if you were fully energized and awake. You will be impaired in making critical decisions.

9. Which of the following is not a tire problem to check for and avoid?
Radial and bias-ply tires used together
Recapped tires on the front of a school bus
Tread separation
All tires are made by the same company

During an inspection, there are a number of tire problems to check for and avoid. Look for air pressure that is too low or too high; excessive wear; cuts or other damage; tread separation; dual tires that come into contact with each other or other parts of the vehicle; mismatched tire sizes; radial and bias-ply tires used together; cut or cracked valve stems; and regrooved, recapped, or retreaded tires on the front wheels of a school bus.

10. If driving a school bus, your four-way flashers should:
Be activated before crossing railroad tracks.
Never be used.
Only be used after crossing railroad tracks.
Only be used near railroad tracks if a train is approaching.

When driving a school bus, you must activate your four-way flashers while approaching and crossing a railroad crossing. Deactivate the flashers once your entire vehicle has cleared the tracks.

11. Routine vehicle inspections should be done to ensure:
Good gas mileage.

The most important reason to inspect your vehicle is to ensure the safety of yourself and other road users.

12. When crossing railroad tracks, you should:
Not stop.
Try to pass slower vehicles.
Change lanes.
Put the vehicle in neutral.

When crossing railroad tracks during the on-road driving skills test, you must not stop, change gears, pass another vehicle, or change lanes while any part of your vehicle is in the railroad crossing.

13. Compared to talking on a cell phone while driving, texting while driving is:
Much safer.
Just as safe.
More dangerous.

Texting while driving is even more dangerous than speaking on a phone while driving. In addition to being mentally distracting, texting is also physically distracting.

14. When driving through a curve during the skills test, you should:
Veer from your lane if needed to complete the curve.
Reduce your speed after entering the curve.
Refrain from looking for other vehicles while turning.
Reduce your speed before entering the curve.

When approaching a curve during the on-road driving skills test, you must reduce your speed sufficiently before entering the curve so that you do not need to further brake or shift in the curve. Keep the vehicle in its lane and continue to check for traffic in all directions.

15. When approaching a vehicle for a pre-trip inspection, a driver should look under the vehicle:
To see if the vehicle is on an incline.
To see if there are any fresh fluids on the ground.
To see if the vehicle is in a parking spot.

When approaching your vehicle before an inspection, make note of its general condition and ensure that it is not damaged or leaning. Look under the vehicle for fresh leaks of oil, grease, or fuel. Check around the vehicle for hazards to movement, such as people, other vehicles, or low-hanging wires or tree limbs.

16. When using road speed to know when to switch gears, you should:
Learn what speeds each gear is good for and shift up when necessary.
Watch other vehicles and try to keep pace.
Watch other trucks and shift when they shift.
Use the speed limit as a guide.

There are two indicators that determine when you need to shift into a higher gear. One indicator is the engine speed (rpm). You should read your vehicle's manual to learn its rpm range and shift up when you reach the top of that range. The other indicator is road speed (mph). You should learn which speeds each gear can accommodate, then keep an eye on the speedometer and shift up as needed.

17. When are people usually the least alert?
In the morning
In the early evening
Late at night

Most drivers are the least alert at night, especially after midnight. Therefore, crashes due to fatigued driving are more likely at night than any other time of day.

18. Over-the-counter medication:
Poses no safety risks to a driver.
Is not referenced by any laws regarding driving under the influence.
Cannot impair a driver.
Can affect a person’s ability to drive safely.

Prescription and over-the-counter medications may have side effects that can impair a person's ability to drive safely. It is illegal to operate a motor vehicle while under the influence of alcohol or any other controlled substance, including some over-the-counter medications.

19. The front of an enclosed trailer should:
Be swept clean.
Contain rags.
Not be used for cargo.
Be free of cracks.

When inspecting an enclosed trailer as a part of the vehicle inspection test, check the front area of the trailer for signs of damage, such as cracks, bulges, or holes.

20. If you are convicted of a traffic violation:
The State will inform your employer.
You must tell your employer.
You must tell the shipper.

If you are convicted of any kind of traffic violation, in any type of vehicle, you must notify your employer within 30 days. You must also inform your motor vehicle licensing agency of the violation within 30 days if the conviction happened in another jurisdiction. This rule does not apply to parking infractions.

21. When passing a row of parked vehicles, a driver should:
Stay close to the vehicles.
Watch for signs of a person exiting a vehicle.
Flash their headlights.

You should be cautious when passing parked vehicles. A person may step out of a parked vehicle or out from between parked vehicles without looking for oncoming traffic. A driver may begin moving their vehicle before realizing you are there.

22. Which of the following is not a reason to cover cargo?
To protect people from spilled cargo
To protect the cargo from weather
To keep the cargo a secret

You should cover your cargo to protect people from the cargo if it spills, as well as to protect the cargo from the weather.

23. During the driving test, the examiner will be scoring you on:
How well-spoken you are.
How quickly you arrive to your destination.
General driving behavior.

During the on-road driving test, the examiner will be score you on specific driving maneuvers as well as on your general driving behavior. You must drive in a safe and responsible manner; obey all traffic signs, signals, and laws; and not cause an accident or commit a moving violation.

24. Regrooved tires are:
Allowed only on the front of a bus.
Allowed only on the rear of a bus.
Not allowed anywhere on a bus.

Regrooved, recapped, or retreaded tires are not permitted to be used on the front of a bus.

25. Header boards:
Should never be used.
Protect the driver from being hit by cargo.
Protect the driver's head when entering the cab of a truck.
Provide extra storage.

Front-end header boards, also known as "headache racks," protect the driver from cargo moving in the event of a crash or emergency stop.

26. The ____ tells a driver how much pressure is in the air tanks.
Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake

A vehicle that is equipped with air brakes must also be equipped with a supply pressure gauge. This gauge tells the driver how much air pressure is in each of the vehicle's air tanks.

27. A thin layer of ice that forms on road surfaces is called:
White ice.
Black ice.
Blue ice.

Black ice is a thin layer of ice that is clear enough for the road surface to be seen through it. A road covered in black ice may look like it is merely wet. You should be very careful when temperatures are below freezing and the road looks wet.

28. Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:
Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.

An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level around 125 psi. This air pressure level is referred to as the "cut-out" level.

29. If you are driving so slowly that you could impede other vehicles, you should:
Stay in the left lane.
Drive with your emergency flashers activated.
Not use any lights.
Wave an arm out of your window.

If you must drive slowly, you should use your emergency flashers to warn other drivers. Be sure that the use of emergency flashers is permitted by local laws.

30. When loading cargo, weight should be placed:
As high as possible.
As low as possible.
As far back as possible.

A vehicle is vulnerable to tipping over if its center of gravity is too high. To prevent this, you should distribute the weight of your cargo evenly and as low as possible.

31. Friction in an S-cam brake is caused when the brake shoes and linings:
Press against the outside of the brake drum.
Press against the inside of the brake drum.
Push against each other.

Friction inside a brake drum is caused when the brake shoes and linings push against the inside of the drum. The friction in the drums will slow and stop the vehicle.

32. The two indicators that determine when you should upshift are:
Engine speed and road speed.
Other trucks and road conditions.
Timing and road position.
Oil pressure and air brake pressure.

There are two indicators that determine when you need to shift into a higher gear. One indicator is the engine speed (rpm). You should read your vehicle's manual to learn its rpm range and shift up when you reach the top of that range. The other indicator is road speed (mph). You should learn which speeds each gear can accommodate, then keep an eye on the speedometer and shift up as needed.

33. If coolant has to be added to a system without a recovery tank, you should:
Keep the vehicle running while adding coolant.
Open the radiator cap quickly.
Not use gloves to touch the radiator cap.
Wait for the engine to cool before adding coolant.

Before adding coolant to a system without a recovery or overflow tank, you must turn the engine off and wait until it cools. Use gloves or a thick cloth to protect your hands. To release the pressure seal, turn the radiator cap slowly to the first stop.

34. Which of the following determines your blood alcohol concentration (BAC)?
How much you drink
How frequently you drink
The temperature of the drink

The main factors that determine a person's blood alcohol concentration (BAC) are how much alcohol has been consumed, how quickly it was consumed, and the person's body weight.

35. What is the number one cause of death and injury in work zones?
Speeding drivers
Careless behavior by construction workers
Drivers driving too slowly
Equipment placed in the roadway

Speeding traffic is the main cause of death and injury in work zones. Drive with special caution when traveling near road workers.

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