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Wisconsin CDL DMV Combination 1

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

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1. To prevent a rollover, a driver should:
Keep cargo low.
Place cargo high.
Keep cargo loose.
Turn quickly.

Rollovers can happen when a combination vehicle is turned too quickly. To help prevent the risk of rollover, it is important to keep the vehicle's center of gravity low by loading cargo as close to the ground as possible.

2. Look for matching colors when coupling glad hands. Service lines are often:

When coupling glad hands, make sure to couple together matching glad hands. To help drivers avoid mistakes, color coding is sometimes used. Service lines are often coded with the color blue and emergency lines are often coded with the color red.

3. Starting in which year were newly manufactured trailers required to have ABS?

All trailers and converter dollies manufactured on or after March 1, 1998 must be equipped with Anti-Lock Braking Systems (ABS).

4. Trailers with low underneath clearance may be difficult to drive:
On interstate highways.
Over railroad crossings.
On dirt roads.
At the posted speed limit.

Railroad-highway crossings may be difficult to cross when pulling a trailer with a low underneath clearance. In particular, both low-slung units and single-axle tractors pulling long trailers are especially challenging to drive over raised crossings.

5. The easiest way to recognize that your trailer has begun to skid is to:
Ask another driver.
Use your mirrors to determine if the trailer has left the lane.
Release the brake pedal and then push it down again.
Watch the jackknife warning light on the control panel.

The easiest way to spot a trailer skid is to use your mirrors. Any time you brake hard, check your mirrors to ensure that your trailer is still in its proper position.

6. Combination vehicles need extra space on the road because they:
Drive more slowly than other commercial motor vehicles.
Are heavier than other commercial motor vehicles.
Need more space to turn and stop than other commercial motor vehicles.

Combination vehicles need more space on the road than other commercial vehicles because they are longer and need more space to turn and stop. It is especially important to properly manage space when you are operating a combination vehicle.

7. If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can:
Check for wheel speed sensors coming from the back of the brakes.
Look for a red light on the front right corner of the converter dolly.
Pump the air brakes to activate the ABS.
Assume the vehicle has ABS.

If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can check under the trailer for wheel speed sensors coming from the back of the brakes.

8. Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.

Be sure to test the trailer emergency brakes before beginning a trip. After ensuring that the trailer rolls freely, you can test the emergency brakes by pulling out the trailer air supply control, or placing it in the "emergency" position. Pull forward slightly with the tractor and make sure the trailer does not move.

9. When a combination vehicle goes around a corner:
The turn should be made as tightly as possible.
The front and rear wheels move in different paths.
The rear wheels should run over the curb.
It is acceptable for street signs to be knocked over if they are too close to the road.

When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called off-tracking. This effect is especially pronounced on vehicles with trailers.

10. If a trailer begins to skid, it is best for the driver to:
Release the brakes.
Quickly turn the steering wheel in one direction, then in the other.

If your trailer begins to skid, you should release the brakes to regain traction. The trailer will begin to straighten out once the wheels begin to grip the road again.

11. A loss of air pressure in the emergency line will cause:
The suspension springs to extend.
The tractor protection valve to open.
The rear trailer to detach from the combination.
The emergency brakes to activate.

The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

12. If oil and water build up in your vehicle's air tanks, the brakes:
May not work correctly.
May feel squishy.
Will squeal loudly when used.
Will be extremely sensitive.

Air tanks should be drained daily to remove water and oil buildup. An excess of oil and water in the air tanks can interfere with proper brake function.

13. If a trailer begins to skid, the driver should:
Lock the brakes.
Release the brakes.
Steer in the opposite direction.

If your trailer starts to skid while you are braking, you should release the brakes and allow them to begin to regain traction. Once its wheels have regained their grip on the road, the trailer will begin to straighten out and follow the tractor.

14. When driving a tractor-trailer equipped with ABS, you should:
Stop harder than you would otherwise.
Use extra braking force to ensure the ABS kicks in.
Brake as you normally would.
Brake using less pressure than you would otherwise use.

When driving a tractor-trailer combination equipped with an Anti-Lock Braking System (ABS), you should brake in the same manner that you would in a vehicle without ABS.

15. When backing up while coupling a trailer, the tractor should be positioned:
Directly in front of the trailer.
Directly next to the trailer.
Parallel with the trailer.

When backing up to couple a trailer, you should position the tractor directly in front of the trailer. Trying to couple while backing at an angle could cause the trailer to move and the landing gear to break.

16. Rollovers are most likely to happen when:
Drivers turn too fast.
Driver turn too slowly.
It is windy.
It is raining.

Rollovers happen when an operator turns too fast. Drivers should be sure to slow down before entering turns and curves, especially when transporting a fully-loaded rig.

17. Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.

Older trailers do not have spring brakes. This means that if the air supply in an older trailer's air tank has leaked away, there will be no working brakes connected to the trailer and its wheels will turn freely.

18. A shut-off valve:
Is located on the front of a trailer.
Is located on the instrument panel.
Prevents air from escaping an air brake system.
Should always be open.

Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.

19. What happens when the wheels of a trailer lock up?
The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
The trailer will stop.

A trailer tends to swing around, potentially resulting in a trailer jackknife, if its wheels lock up.

20. If your vehicle gets stuck on railroad tracks, you should:
Sit in the cab and call for help.
Exit the cab and walk away from the tracks.
Motion for another driver to push your vehicle.

If your vehicle gets stuck on railroad tracks for any reason, you should immediately exit the vehicle and walk away from the tracks. Contact the proper emergency authorities.

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