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Alabama CDL DMV Endorsement Double 1

Take 10 practice tests for CDL is the best way to prepare for your Alabama DMV exam is by taking our free practice tests. The following question are from real Alabama DMV practice test. More than 95% people pass a DMV exam when practice at DMV Practice Test.

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1. 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.

2. On any upgrade, gravity will:
Speed your vehicle up.
Slow your vehicle down.
Not impact your speed.

A vehicle will be slowed down by gravity on any uphill grade. You may need to switch to a lower gear to climb a steep grade.

3. Dollies equipped with ABS are required to have malfunction lamps located where?
On the rear
On the left side
On the front
On the top

A dolly equipped with an Anti-Lock Braking System (ABS) is required to have a yellow malfunction lamp located on its left side.

4. If using air tanks with manually operated drains, how often should you drain the tanks?
Every day
Once a week
Once a month
Once every 3,000 miles

To prevent the build up of oil and water in a vehicle's air tanks, manually operated air tank drains should be used at the end of each day of driving.

5. If an aggressive driver is involved in a crash down the road, you should:
Pull over and yell at them.
Stop after the crash scene and report the other driver’s behavior to police.
Block the driver in with your vehicle.

If you observe a crash involving an aggressive driver, you should stop a safe distance from the crash scene, wait for police to arrive, and inform them of the aggressive behavior you witnessed.

6. How does doubling your speed from 20 mph to 40 mph affect your vehicle's braking distance?
It stays about the same.
It increases slightly.
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 multiply its braking distance by four.

7. A distracted driver:
Usually reacts well to hazards.
Usually has slowed perception.
Is usually aware of what is happening around them.
Is a good person to follow.

Driving while distracted may result in slowed perception, delayed decision-making, and improper actions. Watch for distracted drivers and avoid them, when possible.

8. When approaching your vehicle as part of a pre-trip inspection, seeing fresh oil underneath the vehicle is:
A good sign.
A cause for concern.

When approaching your vehicle, you should check under the vehicle for fresh oil, coolant, grease, or fuel leaks. Spotting any of these before a trip is a cause for concern.

9. What is traction?
Friction between the tires and road
Tires' rates of rotation
The length of time needed to activate the brakes

Traction is friction between your tires and the surface of the road. Adequate traction is necessary for braking and steering.

10. The service air line is attached to the:
Relay valves.
Supply line.
Emergency air line.
Steering wheel.

The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.

11. When it is difficult for others to see your vehicle, such as at dawn or dusk, you can help other drivers by:
Keeping your lights off.
Turning your lights on.
Driving on the shoulder.
Waving an arm out the window.

At times when visibility is low, you should turn your headlights on to the low beam setting. If you are having a difficult time seeing others, they are probably having a difficult time seeing you.

12. If your brakes fail when traveling downhill, decide what to do as quickly as possible because:
The longer you wait, the faster your vehicle will go.
The longer you wait, the more vehicles will get out of your way.
The longer you wait, the slower your vehicle will go.

However you choose to deal with a brake failure on a downhill slope, it is important that you make your decision as quickly as possible. The longer you wait to act, the faster your vehicle will be moving, and the harder it will become to stop.

13. Having ABS on only one axle:
Does not change braking in any way.
Is not possible.
Will allow the driver additional control over their vehicle when braking.
Will cause extra strain on the other axles.

Having an Anti-Lock Braking System (ABS) on only the trailer, or even on just one axle, will still provide a driver with additional control over the trailer when braking.

14. If federal inspectors judge your vehicle to be unsafe, they can:
Bring you to a garage to have your vehicle fixed.
Formerly request that you have your vehicle's problems fixed.
Call a mechanic.
Pull the vehicle out-of-service until it is fixed.

If a federal or state inspector judges a CMV to be unsafe, they may put it out-of-service until it is fixed.

15. 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.

16. 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.

17. The suspension system:
Holds up the vehicle and its load.
Keeps the load the proper distance behind the driver’s compartment.
Maintains a safe distance between the vehicle and other vehicles.
Lightens the load for the tires.

The suspension system holds up the vehicle and its load while keeping the axles in place. Damage to a suspension system can be very dangerous.

18. Doubles and triples:
Can swerve more easily than most other vehicles.
Should be driven 20 mph slower than posted speed limits.
Require the driver to identify hazards well in advance.
Should not be driven in the rain.

To avoid rolling over and jackknifing, doubles and triples must be driven smoothly. To allow this, drivers should look well ahead of their vehicles so they can spot hazards early and have as much time as possible to make the necessary maneuvers.

19. To warn drivers behind you that you will be slowing down, you should:
Turn on the right turn signal followed by the left turn signal.
Tap your brake pedal a few times to illuminate your brake lights.
Swerve from side to side to get their attention.

To let drivers behind you know that you plan to slow down, lightly tap your brake pedal a few times to flash your brake lights. It is important to communicate your intentions to other drivers.

20. Pull out the trailer air supply control to test:
The parking brake.
The trailer emergency brakes.
The trailer service brakes.
The landing gear.

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.

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