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Delaware CDL DMV Knowledge Test Class A 1

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

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1. If unsure if a road is becoming icy, a driver can:
Open the window and check the front of the mirror for ice.
Try to look at the road closely.
Look at a weather forecast.

If you think the road surface may be becoming icy, you can check for ice on your vehicle by opening the window and feeling the front of the side mirror, mirror support, or antenna. If ice has formed on any of these items, the road is likely becoming icy as well.

2. If being tailgated, you should:
Increase your speed.
Increase the amount of space between your vehicle and the vehicle in front of you.
Make quick movements.

If you are being tailgated, you should increase the distance between your vehicle and the vehicle ahead of you. This reduces the need for you to make sudden changes in speed or direction while making it easier for the tailgater to pass your vehicle.

3. Most heavy trucks with manual transmissions require ____ to change gears.
Single clutching
Double clutching
Triple clutching

Most heavy vehicles with manual transmissions require double clutching to shift gears. Learning to effectively change gears by double clutching takes practice.

4. When conducting a vehicle inspection, you must show each of the following, except:
That the oil pressure gauge is working.
That the oil pressure warning light turns off, or that the gauge shows increasing or normal oil pressure.
That the oil temperature gauge, if equipped, rises to the normal operating range.
That the oil pressure gauge comes on when brakes are used.

When checking the oil pressure gauge as part of a vehicle inspection test, you must ensure that it is working. The gauge should show increasing or normal oil pressure, or the oil pressure warning light should turn off. If equipped with one, the oil temperature gauge should begin a gradual rise to the normal operating range.

5. Stopping distance can be affected by:
Time of day.

Stopping distance is affected by a vehicle's speed. The faster you are driving, the longer your stopping distance will become.

6. In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.

In a vehicle with dual parking control valves, there is a separate air tank that can be used to temporarily release the spring brakes if they have been activated due to low air pressure. Pushing in the proper control will release the spring brakes for a short period of time, allowing the driver to move the vehicle in an emergency.

7. When crossing railroad tracks, you should:
Stop on the tracks.
Change gears.
Try to pass.
Stay in your lane.

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

8. What kind of force must emergency brakes use?
Air pressure

Because air pressure can eventually leak away, the emergency brakes in an air brake system must be held on by mechanical force.

9. 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.

10. An Anti-Lock Braking System (ABS):
Decreases your braking distance.
Increases your braking distance.
Creates a loud squeaking noise when being used.
Helps to ensure control while braking.

ABS increases a driver's control during braking. It will not necessarily change the distance needed for a vehicle to come to a complete stop.

11. When entering traffic on an expressway during the skills test, you should:
Check for traffic.
Not use signals.
Abruptly enter a lane of traffic.
Cut off other drivers if needed.

During the on-road driving skills test, you may be asked to enter an expressway. Before doing so, you must check traffic, use proper signals, and merge smoothly into the proper lane.

12. Which of the following is not a cause of hydraulic brake failure?
Loss of hydraulic pressure
Brake fade on long hills

Most cases of hydraulic brake failure come from one of two causes. The brakes may fail due to a loss of hydraulic pressure or due to overuse on long hills, causing the brakes to fade.

13. When encountering fog, you will be safest if you:
Stay in the left lane.
Don’t drive in the fog.
Use your low beam lights.
Follow the vehicle ahead of you closely.

Fog can quickly deteriorate drivers' ability to see the road, other drivers, and other hazards. Avoid driving in fog if at all possible.

14. Eating while driving:
Is a good way to maximize time.
Is encouraged on long trips.
Creates a distraction for the driver.
Is mandatory so cargo is not left unsupervised.

To reduce the chances of driving distracted, you should avoid eating, drinking, or smoking while driving. Anything that diverts attention from the task of driving is a distraction.

15. A cardboard box on the roadway:
Is not a cause for concern.
Is usually empty.
May contain a heavy object that could damage your vehicle.
Should be avoided by driving off the roadway.

Any foreign object on the road is potentially dangerous. For example, something seemingly harmless, such as a cardboard box or paper sack, could contain a hard or heavy object that could do serious damage to a vehicle.

16. Which type of brakes do most heavy-duty vehicles have?
Air brakes
Solid brakes
Liquid brakes
Gravity brakes

For safety, most heavy-duty vehicles are equipped with dual air brake systems.

17. On trucks and buses, where are ABS malfunction lamps located?
On the driver’s door
On the instrument panel
On the outside of the vehicle by the passenger’s door
Under the hood

Tractors, trucks, and buses with Anti-Lock Braking Systems (ABS) have yellow malfunction lamps located on their instrument panels. Trailers have yellow ABS malfunction lamps on their left side, either on the front or rear corner.

18. If a traffic light has been green for a long time:
It will probably stay green as you approach.
It is likely broken.
It is likely that the light will soon change to yellow.
It is likely the light will skip yellow and change from green to red.

If you are approaching a traffic light that has been green for a long time, there is a good chance that it will turn yellow before you reach it. Start slowing down and be ready to stop.

19. Failing to drain air tanks could result in:
Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

In an air brake system, the air tanks must be periodically drained to remove accumulations of water and compressor oil. If water is not removed, it could freeze in cold weather and cause brake failure.

20. Which of the following indicates drowsy driving?
Eyes going out of focus by themselves
Having trouble keeping your head up
Drifting from lane to lane
All of the above

Indicators of drowsiness while driving include your eyes closing or going out of focus by themselves, having trouble keeping your head up, and drifting between lanes.

21. If confronted by an aggressive driver, you should:
Try to get out of their way.
Avoid making eye contact.
Ignore their hand gestures.
All of the above.

If confronted by an aggressive driver, the most important thing to do is try to get out of their way. Avoid making eye contact with the driver and do not let yourself be provoked by gestures. Do not try to challenge aggressive drivers by speeding up.

22. When asked to make a lane change during the driving test, you should:
Make the change as soon as the examiner asks, without looking.
Use your turn signal and change lanes when safe.
Make the lane change as quickly as possible, even if that means cutting off another driver.

You will be asked to change lanes during the on-road driving test. When the examiner asks you to do this, you should make the necessary traffic checks and use the proper signals before changing lanes.

23. Which of the following is not a crime that would disqualify an applicant from a hazardous materials endorsement?
Immigration violations

There are a number of crimes that will disqualify a person from receiving a hazardous materials endorsement for seven years. Among these are kidnapping or hostage taking, smuggling, and immigration violations. More serious crimes, such as murder, will result in a lifetime disqualification.

24. An encroachment is when:
A driver does not appear for their scheduled basic skills test.
A vehicle touches an exercise boundary line during the basic skills test.
A driver fails one section of the basic skills test.

An encroachment during the basic vehicle control skills test is when an exercise boundary line is touched or crossed by any portion of the applicant's vehicle. Every encroachment will be counted as an error.

25. When using a turn signal, you should not:
Signal early.
Signal continuously.
Cancel the turn signal after completing the turn.
Allow the turn signal to stay on long after the turn has been completed.

Always signal well ahead of a turn or lane change. Signal continuously until you have completed the turn or lane change, then be sure to cancel the signal so you do not confuse other drivers.

26. If you are confronted by an aggressive driver, you should:
Make eye contact with the driver.
Stay in the driver's lane.
Try to race the driver.
Ignore the driver's gestures.

If confronted by an aggressive driver, the most important thing for you to do is get out of their way. Avoid making eye contact, do not challenge them by increasing your speed, and do not let yourself be provoked by any angry gestures they direct toward you.

27. Front brake limiting valves were intended to:
Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.

Some older vehicles with air brakes have front brake limiting valves. These valves were intended to reduce the risk of front wheels skidding. However, research has shown that such devices are unnecessary, so they should be left in the "normal" position.

28. If you are being tailgated, you should:
Drive on the shoulder.
Pull off the roadway.
Drive faster.
Allow the vehicle to pass.

If someone is tailgating you, it is a good idea to open up the space ahead of your vehicle to make it easier for the driver to pass you. Increasing your speed is not a good idea because the driver may continue to tailgate you at the higher speed, only increasing the danger.

29. What is Gross Vehicle Weight (GVW)?
The total weight of a vehicle and its load
The total weight of a vehicle's tractor
The total weight of a loaded trailer
The weight of a tractor and trailer, before adding in the load

Gross Vehicle Weight (GVW) is defined as the total weight of a single vehicle in addition to its load.

30. 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.

31. One way to prevent hydroplaning on wet road surfaces is to:
Ensure that your tires have good tread depth.
Under-inflate your tires.
Drive faster than usual.

When driving on a wet road surface, the risk of hydroplaning is increased if your tire pressure is too low or your tire tread is too worn. If you begin to hydroplane, release the accelerator and push in the clutch to slow down.

32. A CMV should:
Not have a fire extinguisher, unless it is being used to transport hazardous materials.
Not have a fire extinguisher, unless it will be traveling through remote areas.
Have a fire extinguisher and other emergency equipment.

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.

33. If a load is 10 feet long, it should be secured by a minimum of:
One tie-down.
Two tie-downs.
Three tie-downs.

Cargo should be restrained by at least one tie-down for every 10 feet of cargo. However, all cargo should have at least two tie-downs, no matter the size of the cargo.

34. When approaching a railroad crossing:
You will likely be able to outdrive a train.
You should not rely only on warning signals.
You should roll a window down to listen for an approaching train.
You should only worry about the track closest to your vehicle.

You should never rely only on warning signals to alert you to an approaching train. Never try to race a train to a crossing. If there are multiple tracks at a crossing, be sure to check all tracks in both directions before starting to cross.

35. When the brake pedal is pushed down, air brakes work:
After a short delay.
After about a minute.
Only if it is warm outside.

Because air takes time to flow through the air lines to the brakes, air brakes cannot begin working instantly. There is often a brake lag of at least one-half of a second between the moment the brake pedal is pressed and the moment the brakes begin to work.

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