Over 95% pass rate when practice at DMV Practice Test

Nebraska CDL DMV Knowledge Test Class A 1

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

Number of Test
Number of Question
Passing score
  • 0Correct
  • 0Incorrect
Not enough to pass :-(

Ouch! While you were on a roll there for a few questions, you didn’t pass this time. But I know this test, and I think you’ll pass next time. Really.

1. Most heavy-duty vehicles use ____ air brake systems.

The majority of heavy-duty vehicles are equipped with dual air brake systems.

2. What do headers do?
Protect the driver during a crash
Provide a place for storage
Ensure that controls are accessible
Act as wind guards

Front-end header boards protect the driver from the forward motion of their cargo in the event of a crash or emergency stop.

3. Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes

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 levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.

4. When going down a steep downhill, your primary source of braking should be:
Engine adjustments/downshifting.
Using the brake.
Using the parking brake.
Using ABS.

On a steep downgrade, you must use the engine's braking effect as your primary method of speed control. Be sure to decelerate and downshift appropriately before beginning to drive down the hill.

5. A vehicle equipped with an Anti-Lock Braking System (ABS) can be identified by:
A sticker on the control panel.
A yellow lamp on the instrument panel.
The letters "ABS" on the brake pedal.
A metal plate on the inside of the driver’s side door.

You can tell that your vehicle is equipped with an Anti-Lock Braking System (ABS) if it has a yellow ABS malfunction lamp on the instrument panel.

6. A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve

A modulating control valve allows a driver to gradually apply spring brakes. In equipped vehicles, the valve is controlled by a lever located on the dashboard.

7. Eating while driving:
Is a good way to maximize your time.
Is encouraged during long trips.
Is a distraction to the driver.

Eating while driving can be a dangerous distraction to the driver both because it diverts their attention away from the task at hand and requires them to remove a hand from the steering wheel.

8. When driving in fog, you should:
Use the windshield wipers.
Use low beam headlights.
Use high beam headlights.
Use the air conditioning.

If you must drive in fog, you should use your low beam headlights and fog lights, even during the daytime.

9. ____ is an example of required emergency equipment.
A spare electrical fuse
A loud horn
A battery-operated flashlight

All commercial motor vehicles are required to be equipped with the proper emergency equipment. This may include spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher.

10. 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.

11. Black ice is:
Usually thick.
Usually thin.
Not a hazard when driving.

Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. The surface will look like a wet road. Always be alert to black ice if the road looks wet when the temperature is below freezing.

12. When should mirror adjustments be made?
Before starting a trip
While driving
When a vehicle is stopped at a traffic signal

Mirror adjustment should be checked prior to the start of each trip. Any attached trailer should be straight while mirrors are being adjusted.

13. Driving in extremely hot weather:
Should not be done.
Requires you to remove oil from the engine.
Is safer with less coolant.
Can increase tire pressure.

In extremely hot weather, tire pressure can increase to dangerous levels due to the expansion of the air in heat. To keep an engine from overheating, it is important that there be enough oil and coolant in the engine compartment.

14. Failing to drain the tanks in an air brake system can result in:
Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.

In an air brake system, the air storage tanks must be drained to remove accumulated water and compressor oil. Failing to do this can cause damage. For example, water that has built up in the system could freeze in cold weather and cause brake failure.

15. If a tire fails, you should:
Use the brakes.
Stay off the brakes.
Wave your arms at other drivers.

Using the brakes after a tire failure could cause you to lose control of your vehicle. Unless you're about to hit something, stay off of the brake until the vehicle has slowed sufficiently.

16. How much water needs to be on the surface of a road for a vehicle to hydroplane?
Usually several inches
A good amount, such as a large puddle
A small amount

Hydroplaning is an effect in which a vehicle's tires lose traction with the surface of the road and instead glide along a layer of water. There does not have to be much water on the road for this to occur.

17. When inspecting cargo, the driver should ensure all of the following, except:
That the truck is not overloaded.
That the cargo is balanced.
That the cargo is secured properly.
That the cargo is heavier at the top than the bottom.

When inspecting cargo, a driver must ensure that the cargo is balanced and properly secured. To reduce the risk of a rollover, the weight of a load of cargo should be kept as low as possible. A trailer should not be overloaded.

18. 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.

19. 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.

20. What can happen if one-fourth of the leaves in a leaf spring are missing when a vehicle is inspected?
The vehicle’s driver will be allowed to drive, but only at reduced speeds.
The vehicle will be put out-of-service until it is fixed.
The vehicle will be fine to drive since most of the spring is in place.
The driver will be asked to decrease the weight of the load.

If at least one-fourth of the leaves in a leaf spring are missing, the vehicle will be put out-of-service until the defect is fixed.

21. During the vehicle inspection test, you will be required to do all of the following, except:
Walk around the vehicle.
Point to or touch each item.
Explain what you are checking and why.
Crawl under the vehicle.

As a part of earning your CDL, you will have to pass an inspection test and demonstrate that your vehicle is safe for operation. During the vehicle inspection test, you will have to walk around the vehicle and point to or touch each item and explain to the examiner what you are checking and why. You will not have to crawl under the hood or under the vehicle.

22. In a vehicle with dual air brakes, what happens if one system is low on pressure?
The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.

In a dual air brake system, if one of the air systems gets very low on pressure, either the front or rear brakes will not be operating fully. You should bring your vehicle to a safe stop and have the air system repaired.

23. During a basic vehicle controls skills test exercise, your vehicle's final position should be:
In the general area that was described by the examiner.
In the exact final position described by the examiner.
Within three feet of the final position described by the examiner.

You should finish each exercise with your vehicle in the exact position described by the examiner. You can be penalized for failing to complete an exercise exactly in the manner described by the examiner, potentially resulting in failure of the basic control skills test.

24. When using the controlled braking method in an emergency situation, you should:
Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.

The controlled braking method for emergency stops involves applying the brakes as hard as you can without locking the wheels. Keep steering wheel movements small when braking in this way.

25. During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.

It is important to know the maximum air loss rate that is safe for your specific vehicle. A double combination vehicle should have a leakage rate no higher than 4 psi in a minute during an applied leakage test.

26. Where can you find the tire load rating?
On the inside of the driver’s door
On the dashboard
On the side of each tire
Under the hood

A tire load rating is the maximum safe weight that can be carried by a tire at a specified pressure. This number is stated on the side of each tire.

27. When driving under wet conditions, what does a lack of spray from other vehicles indicate?
Ice has formed on the road.
The pavement is dry.
The spray is caught on the underside of the vehicle.
The tires have soaked up all the moisture.

If the road appears to be wet but the wheels of other vehicles are no longer generating spray, ice has formed on the road. Drive with extra caution when operating on wet or icy roads.

28. During an inspection, slack adjusters on S-cam brakes should not move more than:
One foot.
One centimeter.
One inch.

Check each slack adjuster after parking on level ground, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure 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.

29. Texting while driving is especially dangerous because:
It is both a mental and physical distraction.
A message may be upsetting to the driver.
People like to read and may become too engaged in their phones.

Texting while driving is particularly dangerous because it is both a mental and physical distraction to the driver. In addition to diverting a driver's mental attention away from the road, texting requires a person to remove at least one hand from the vehicle's controls.

30. Scan the road ____ ahead of your vehicle.
Two to three seconds
Five to six seconds
12 to 15 seconds

Good drivers scan the road at least 12 to 15 seconds ahead of their vehicles. Looking ahead will allow you to identify and react to hazards before meeting them. Be sure to specifically look for vehicles that are coming onto the highway, entering into your lane, or turning.

31. How is water and compressor oil removed from the bottom of an air storage tank?
The water and oil are siphoned out of the tank.
A drain valve is opened to remove the water and oil from the tank.
The water and oil are removed automatically as the brakes are used.
A sponge is used to soak up the water and oil.

Water and compressor oil are removed from air storage tanks through a drain valve. The water and oil can damage the brakes if left to accumulate in the system. Manually operated tanks must be drained every day to remove this build-up.

32. When using a fire extinguisher to put out a fire, you should:
Stay as far away as possible from the flames.
Aim at the flames.
Use any extinguisher on every type of fire.

Stay as far away from a fire as possible and aim your fire extinguisher at the source or base of the fire, not at the flames. It may be appropriate to extinguish certain fires with water. If you are unsure of how to treat a specific fire, you should wait for trained firefighters to arrive.

33. In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

When inspecting a vehicle with a dual air brake system, you should wait for air pressure to build from 85 to 100 psi in both the primary and secondary systems. This should take about 45 seconds.

34. If you will be transporting hazardous materials that require placards, you must:
Ask permission of the local law enforcement agency.
Obtain a hazardous materials endorsement.
Transport the materials only at night.

To operate a vehicle of any size that is used to transport hazardous materials requiring placards, you must have a CDL with a hazardous materials endorsement.

35. Too little weight on a steering axle can result in:
Poor traction.
Increased visibility.
Longer stopping distances.
Improved gas mileage.

The weight of cargo in a vehicle needs to be balanced appropriately so that it does not interfere with the vehicle's safe handling. For example, if cargo is placed too far to the rear of a vehicle, the front axle will be under-weighted and the front wheels may not have enough traction for the driver to steer safely.

Your Progress
  • 0Incorrect (7 allowed to pass)
  • 0Correct