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Wisconsin CDL DMV Knowledge Test Class A 1

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1. During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.
3 psi
5 psi
7 psi
9 psi

When performing a static leakage test on a triple combination vehicle with air brakes, the leakage rate should be no more than 5 psi in one minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.

2. What is a wig wag?
A type of warning system
A tube used to move air from the compressor to the tanks
A noise made by air brakes when used
A part within the braking unit that allows air to move freely

A wig wag is a type of low air pressure warning device in an air brake system. It drops a mechanical arm into the driver's view when the air pressure in the tanks falls below 60 psi.

3. When driving:
You should always drive at the posted speed limit.
You should always drive slightly below the posted speed limit.
You should adjust your speed according to conditions.
You should drive as fast as possible.

Operators driving too fast is a major cause of fatal crashes. You must continually adjust your speed to a rate that is safe for road and traffic conditions.

4. You should always use at least ____ to secure cargo on a flatbed trailer.
One tie-down
Two tie-downs
Three tie-downs
Four tie-downs

When transporting cargo on a flatbed trailer, you should use at least one tie-down for every 10 feet of cargo. Any cargo, no matter how small, should be restrained by a minimum of two tie-downs.

5. When inspecting the windshield before a trip, a person should do all the following, except:
Remove and sharpen the wiper blades.
Check the windshield wipers for proper spring tension.
Check the wiper blades for damage.

When inspecting your windshield, you should look for cracks or other problems that could interfere with your ability to clearly see the road. The windshield wiper arms should be checked for proper spring tension. The wiper blades should be checked for damage, stiff rubber, and improper securement.

6. When driving down a steep grade, your brakes may fade. What happens if brakes fade?
They become quieter.
They become less effective.
They work better than usual.
They work differently from front to back.

If you use your brakes too much when traveling on a steep downgrade, they may overheat and become less effective. To avoid causing your brakes to overheat on a steep hill, you should rely on engine braking.

7. Eating while driving is:
A good way to save time.
A dangerous activity.
Acceptable if you are eating foods that are easy to eat.

Smoking, eating, or drinking are distracting activities and should be avoided while you are driving. Instead, plan ahead and allow yourself time to stop to eat when making a lengthy trip.

8. During the driving test, the examiner will be scoring you on:
How quickly you arrive to your destination.
Your general driving behavior.

During the on-road driving test, the examiner will be scoring you on specific driving maneuvers, as well as your general driving behavior.

9. Bridges usually:
Freeze, but only once the temperature drops significantly below 32 degrees Fahrenheit.
Freeze after other road surfaces freeze.
Freeze before other road surfaces.
Have heaters to prevent them from freezing.

Bridges usually freeze before the rest of the road. You should be especially careful when crossing bridges if the temperature is near the freezing point.

10. A fatigued driver:
Is usually extra alert.
Is usually more conscientious than a typical driver.
May be slower to make critical decisions than a typical driver.

Fatigued drivers are slower to see or react to hazards than drivers who are not fatigued. Drivers are impaired in their ability to make critical decisions when they are driving drowsy.

11. 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.

12. Which of the following is acceptable if found during a pre-trip inspection?
Tires in mismatched sizes
Tread depth of 2/32 of an inch in the grooves of the front tires
Tires manufactured by different makers
Cracks in the tires

When inspecting your tires, verify that there is tread depth of at least 4/32 of an inch in every major groove on the front tires and tread depth of at least 2/32 of an inch in grooves on the other tires. Be sure that your tires are not too worn, are not cracked, have proper air pressure, and are all equally sized.

13. What helps prevent wheel lockup when braking?
An Anti-Lock Braking System (ABS)
Air brakes
An alternator

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheel lockup while brakes are being applied.

14. 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.

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

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

16. 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.

17. If driving a truck that requires a CDL for operation:
You do not need to wear a seat belt.
You are required to wear a seat belt, but only if transporting more than 500 pounds of cargo.
You are always required to wear a seat belt.
You are only required to wear a seat belt when driving a tank trailer.

For safety, you must wear your seat belt at all times while operating a CMV.

18. When driving with covered cargo, a cover that flaps:
Is acceptable.
Allows air to keep the cargo cool.
Can tear loose.
Can attract birds.

Cargo covers should not flap in the wind. They could tear loose, not only uncovering the cargo but also blocking the views of drivers.

19. Which of the following is the best advice for driving in fog?
Try not to drive in fog.
Use your high beam headlights.
Turn off your lights.

Driving in fog is always dangerous and should be avoided entirely if at all possible. If you must drive in fog, be sure to turn on your low beam headlights and fog lights, even during the daytime.

20. A poor balance of weight in a trailer:
Can make handling unsafe.
Improves traction.
Increases fuel efficiency.

Poorly balanced weight in a trailer can make handling unsafe. For example, either too little or too much weight on the front axle can make a vehicle difficult to steer. Weight should be distributed evenly from front to back and from side to side. It should be distributed as low as possible.

21. 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.

22. Header boards:
Should never be used.
Protect drivers from being hit by cargo.
Protect drivers' heads when they are entering the cab of a truck.

A header board protects a driver from moving cargo in the event of a crash or emergency stop.

23. What color are ABS malfunction lamps?

Vehicles with Anti-Lock Braking Systems (ABS) have yellow malfunction lamps.

24. Some air brake systems introduce alcohol into the system to:
Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.

Some air brake systems contain an alcohol evaporator. An evaporator introduces alcohol into the system to help inhibit the formation of ice in cold weather.

25. What does ABS do?
Prevent wheel lockup
Prevent the air compressor from overheating
Prevent the front brakes from being used on ice
Prevent the brakes from being used if downshifting would be more effective

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheels from locking up during hard applications of the brakes, especially on slippery surfaces.

26. The drive shaft should:
Be bent toward the passenger side.
Be bent toward the driver’s side.
Be bent to one side or the other.
Not be bent.

During the vehicle inspection test, you should check that the drive shaft is not bent or cracked.

27. A vehicle equipped with an Anti-Lock Braking System (ABS) uses a ____ light to warn that the system is not working properly.

Anti-Lock Braking System (ABS) malfunction lamps are usually yellow. Even if the ABS isn't working properly, a driver will still have access to the vehicle's usual braking functions.

28. Applying the brake pedal causes air pressure to activate an electric switch and:
Turn off the brake lights.
Turn on the low pressure warning light.
Turn on the brake lights.
Turn off the low pressure warning light.

In a vehicle with air brakes, the brake lights are activated when the brake pedal is pushed and air pressure moves an electric switch. With the application of air pressure, the switch will then turn on the brake lights.

29. To use the controlled braking method, you should:
Lock your wheels while braking.
Apply your brakes as firmly as possible without locking the wheels.
Slightly tap the brakes.

Controlled braking is the method of applying a vehicle's brakes as hard as possible without locking the wheels. A driver should keep steering wheel movements very small if braking while using this method.

30. If a roadway is covered by fog, it is best for you to:
Drive faster than usual.
Use your high beam headlights.
Turn off your headlights.
Avoid driving.

Driving in fog is always dangerous. If possible, you should always avoid driving under foggy conditions.

31. How could you reduce your stress while driving?
Drink a caffeinated beverage
Talk on your cell phone
Gesture at other drivers
Listen to calming music

Being under stress can lead to aggressive driving, which is dangerous. Playing calming music can help you become more relaxed if you are feeling stressed while driving.

32. When making tight maneuvers, it is important for a driver to:
Open the door for a better look.
Use their mirrors.
Flash their headlights.
Open their cargo door.

While regular mirror checks should always be part of your driving routine, you should make a particular point of checking the mirrors when changing lanes, turning, merging, or making tight maneuvers.

33. What is a tire load?
The minimum safe weight a tire can carry
The maximum safe weight a tire can carry
The weight of a tire

Tire load is defined as the maximum safe weight that a tire can carry at a specified pressure.

34. When transporting cargo, drivers must check the securement of the cargo every:
10 miles.
150 miles.
500 miles.

The securement of cargo must be checked within the first 50 miles of a trip, and then again every three hours or 150 miles.

35. Dry bulk tanks:
Usually have low centers of gravity.
Usually have high centers of gravity.
Usually are not allowed to cross railroad tracks.
Cannot be driven on interstates.

Dry bulk tanks require special care when being driven because they have high centers of gravity. Drivers should also be careful because the materials being carried can easily shift in transit, causing a change in the vehicle's handling.

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