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Louisiana CDL DMV Knowledge Test Class A 1

Take 6 practice tests for CDL is the best way to prepare for your Louisiana DMV exam is by taking our free practice tests. The following question are from real Louisiana DMV practice test. More than 95% people pass a DMV exam when practice at DMV Practice Test.

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1. How does doubling your speed from 20 mph to 40 mph affect your vehicle's braking distance?
It stays about the same.
It doubles.
It quadruples.

Increasing your vehicle's speed will increase your vehicle's striking power and braking distance. Doubling your vehicle's speed from 20 to 40 mph will quadruple its braking distance.

2. ABS allows you to:
Drive faster.
Brake harder.
Stay in control when stopping.

The function of an Anti-Lock Braking System (ABS) is to help prevent wheel lockup during hard braking. With ABS equipped on your vehicle, you should drive and brake in the same manner that you would without it.

3. Foundation brakes are used:
Only on the front wheels of a vehicle.
Only on the rear wheels of a vehicle.
On each wheel of a vehicle.

Foundation brakes are used on each wheel of a CMV. The most common type of foundation brake is the s-cam drum brake.

4. When experiencing cold weather, be sure to check your vehicle's alcohol evaporator:
Every three hours.
Every day.
Every other week.

An alcohol evaporator can help prevent ice from building up in an air brake system. In cold weather, the evaporator should be checked and refilled every day.

5. Rust around wheel nuts may mean:
It has rained recently.
The nuts could be loose.
The tires should be replaced.

Rust around wheel nuts may mean that they are loose. Check the tightness of the nuts if you see any rust in the area.

6. When backing a truck, you should:
Only use the side mirrors on the driver’s side.
Use both side mirrors.
Only use the side mirrors on the passenger's side.

Backing a commercial motor vehicle is always dangerous because you cannot see everything behind you. When backing, make frequent checks of the mirrors on both sides of the vehicle.

7. When passing another vehicle, you should:
Make eye contact with the other driver.
Assume the other driver doesn't see you.
Slow down.

Whenever you pass another driver, bicyclist, or pedestrian, you should assume as a precaution that they do not see you.

8. Driving with a cargo of hanging meat in a trailer:
Is discouraged during the summer months.
Can be problematic because animals are attracted to the smell of the meat.
Is challenging because the load has a high center of gravity.

An operator should drive with care when transporting a cargo of hanging meat. Such a load is unstable, both because it has a high center of gravity and because the swinging of the meat can affect the driver's handling of the vehicle.

9. To prevent becoming an aggressive driver you should:
Increase your speed.
Make gestures at other drivers.
Give other drivers the benefit of the doubt.

To avoid engaging in aggressive driving behavior, it is helpful to give other drivers the benefit of the doubt. Assume that they have valid reasons for what they are doing and don't take their actions personally.

10. Convex mirrors:
Cannot be used on vehicles transporting hazardous materials.
Are illegal in most states.
Can help drivers see a larger area.

Many large vehicles have curved, convex mirrors. Convex mirrors allow drivers to see a wider area than flat mirrors. However, they also make objects seem smaller and farther away than they really are.

11. To ensure that you do not slow down traffic when driving a large truck, you should:
Switch gears while driving uphill.
Try to pass another vehicle while driving uphill.
Stay in the right lane whenever possible.

If a heavy load prevents your vehicle from keeping up with the speed of other traffic, you should stay in the right lane.

12. What does the air compressor governor do?
It stops the compressor from pumping air.
It turns on the air compressor.
It stores the compressed air.

In an air brake system, the air compressor governor controls when the air compressor pumps air into the storage tanks. It stops pumping if the pressure in the tanks becomes too high, and begins pumping if the pressure becomes too low.

13. If you must drive in reverse, using driver's side backing:
Is always encouraged.
Is discouraged.
Is only recommended if it is raining.

If you must back up, it is safest to back toward the driver's side of the vehicle. This way, as the driver, you will have the best possible view of your path of travel.

14. If other vehicles are having a difficult time getting around your truck on a road with two or more lanes, you should:
Speed up.
Drive on the shoulder.
Use the right lane.

You should stay in the right lane of a multilane road if your vehicle is being slowed down by a heavy load. Allow other vehicles to pass your truck using the left lane.

15. Which of the following is not a reason to cover cargo?
To protect people from spilled cargo
To protect the cargo from weather
To protect the cargo from animals

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

16. 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.

17. Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).

Truck tractors with air brakes built on or after March 1, 1997, and other vehicles with air brakes built on or after March 1, 1998, must be equipped with anti-lock brakes.

18. A driver who stops at a green light could be:
An impaired driver.
A driver who is color blind.
A person who does not know the rules of the road.

It is important to observe other drivers' actions and identify clues that a person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. One sign that a driver may be impaired is that they stop in inappropriate places, such as at green traffic lights.

19. What is often found in compressed air?
Brake fluid

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.

20. Mirrors should be:
Checked only when changing lanes.
Checked frequently.
Checked only if there is a reason to suspect a problem.

When driving, you should regularly check your mirrors, both to be aware of traffic and to check for problems on your own vehicle.

21. When leaving your vehicle:
The air brakes should be applied.
The parking brake should be applied.
Brakes should not be applied if the vehicle is left out of gear.

Parking brakes should be used whenever you park. If necessary, chock your wheels.

22. On slippery roads, you should:
Accelerate and slow down frequently.
Adjust your driving to match weather conditions.
Tailgate other vehicles.

On a slippery road, you must adjust your driving speed to fit conditions. Because it will take longer for your vehicle to stop on a slippery road than on a dry road, you should increase your following distance when conditions are slippery. Avoid driving in a way that requires you to change speeds frequently.

23. When in heavy traffic, the safest driving speed is:
Slower than the speed being driven by surrounding traffic.
The same speed being driven by surrounding traffic.
Faster than the speed being driven by surrounding traffic.

In heavy traffic, it is safest to travel at the same speed as other vehicles. If two vehicles continue to drive in the same direction at the same speed, they cannot hit each other.

24. An Anti-Lock Braking System (ABS):
Is not available for vehicles with air brakes.
Is not helpful in most driving situations.
Can help you maintain control when braking.

Anti-Lock Braking Systems (ABS) are compatible with air brakes and help a driver maintain control of their vehicle by preventing wheel lockup.

25. When encountering a railroad crossing during the driving test, you should:
Pass another vehicle on the tracks if the other vehicle is moving too slowly.
Change lanes while on the tracks.
Not change gears while on the tracks.

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

26. If you’re not sure what to do to extinguish a fire in your vehicle, you should:
Use water.
Stay inside the vehicle.
Wait for the firefighters.

If you are not sure which kind of extinguisher should be used on a fire in your vehicle, particularly a hazardous materials fire, you should wait for the firefighters to arrive and allow them to extinguish it.

27. Parked delivery trucks may be hazardous because:
The trucks are often shiny.
People are often in a hurry when exiting such trucks and may not look for other vehicles.
Packages often fall out of the trucks and into the road.

Passing parked delivery or postal trucks can be dangerous because the driver may be in a hurry and pull into traffic without warning, or may they suddenly step out of the vehicle without checking for other traffic.

28. Dry bulk tanks:
Usually have low centers of gravity.
Usually have high centers of gravity.
Are usually not allowed to cross railroad tracks.

Dry bulk tanks require special care to be driven, both because they have high centers of gravity and because the weight of the load can shift in transit.

29. Once they have begun to drive after a tire on their vehicle has been changed, a driver should stop after a short distance to:
Ensure that the lug nuts are still tight.
Ensure that the tire is wearing evenly.
Ensure that the air pressure of the tire is still acceptable.

Once you have begun to drive after a tire has been changed, you should stop after a short distance to recheck the tightness of the lug nuts.

30. When traveling at speeds under 40 mph, you should maintain at least ____ of following distance for every 10 feet of your vehicle's length.
One second
Two seconds
Three seconds

When traveling at speeds under 40 mph, you should allow a minimum of one second of following distance for every 10 feet of your vehicle's length. At faster speeds, add at least one additional second.

31. When taking the driving test and asked to make a turn, you should:
Not use a turn signal since you were told to make the turn.
Check traffic only to your right.
Check traffic in all directions.

When asked to make a turn during the on-road driving test, you must check traffic in all directions and use your turn signal.

32. Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

Vehicles with ABS have yellow malfunction lamps to alert drivers when the braking systems are not working. Be sure you know where the malfunction lamp on your vehicle is before beginning a trip.

33. The heavier the vehicle:
The less important the brakes become.
The harder the brakes need to work.
The quieter the brakes will sound.

The heavier a vehicle is, the more the brakes will need to work to bring the vehicle to a complete stop.

34. A bridge formula:
Permits less weight per axle for axles that are close together.
Permits more weight for trucks.
Is not a concern for drivers.

Maximum axle weights are often set by a bridge formula, which sets a lower maximum weight for axles that are close together.

35. Drowsy driving is most common during:
The night.
The early morning.
The mid-afternoon.

Drowsy driving is most common during the night because people are naturally prone to be less alert in the hours during which they are normally asleep. If you must drive at night, take every precaution to prevent fatigued driving.

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