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Texas CDL DMV Endorsement Double 2

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

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1. 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.

2. If you are unsure if there is enough space for your vehicle to safely travel under a bridge, you should:
Speed up.
Swerve as you pass under the bridge.
Slow down.
Drive on the shoulder.

If you aren't sure that you have space for your vehicle to safely fit underneath an overhead object, slow down and seek an alternate route if possible.

3. To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.

Some pre-1975 vehicles have a front brake limiting valve, which has "normal" and "slippery" settings. The idea behind these valves was to limit the air pressure available to the front brakes when driving on slippery surfaces, and thereby reduce the danger of a front-wheel skid. Studies have found that this is not actually a concern, so if your vehicle has a front brake limiting valve, leave it in the "normal" position.

4. A sign indicating a maximum safe speed:
Is suggesting a driving speed, but vehicles may travel faster than the posted speed.
Is suggesting a speed limit to be followed only by vehicles weighing more than 26,000 pounds.
Should be followed and no vehicle should travel faster than the posted speed.
Is only applicable to automobiles.

You should never exceed the speed shown on a "Maximum Safe Speed" sign.

5. Emergency brakes:
Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. These brakes must be held by mechanical force.

6. When backing, you should:
Move quickly to get out of the way of other drivers.
Try not to use your mirrors.
Start from any position.
Use a helper, if possible.

Backing a large CMV is always dangerous because you will not be able to see everything behind you. If you must back up, use a helper, if possible.

7. 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.

8. What color is the low air pressure warning light?

A low air pressure warning signal is required in vehicles with air brakes. The warning light is usually red and may be accompanied by a buzzer.

9. Large combination vehicles take the longest amount of time to stop:
When fully loaded.
When partially loaded.
When empty.
When mostly loaded.

Large combination vehicles take longer to stop when they are empty than when they are loaded. The decreased weight causes a vehicle's wheels to have decreased traction on the surface of the road.

10. After finishing a pre-trip inspection, you should:
Close the service line valve.
Remove the service line valve.
Leave the emergency line valve open.
Leave the rear shut-off valves open.

Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves to listen for escaping air. Close both shut-off valves before beginning to drive.

11. When checking the engine compartment:
The parking brake should not be engaged.
Wheels should be chocked.
The engine should be running.
The gearshift should be in first gear.

Before inspecting the engine compartment, make sure that the parking brakes are on and/or the wheels are chocked. Check the engine compartment before entering the cab and starting the engine.

12. A tractor protection valve is:
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
A device that prevents theft.
A device that controls fuel levels.
A device that allows the battery to recharge efficiently.

On combination vehicles with air brakes, the tractor protection valve keeps air in the tractor or truck brake system, should the trailer develop a bad leak or break away from the tractor.

13. Due to the "crack-the-whip" effect:
Doubles and triples are more likely to turn over than other combination vehicles.
A combination vehicle will make a loud noise if driven fast enough.
The tires on a middle trailer will lock up at all stops.
Vehicles following a truck will be able to travel faster than normal.

Double and triple trailer combinations are more likely to turn over due to the "crack-the-whip" effect than are other combination vehicles. Drivers should be aware of the rearward amplification of their specific vehicles and steer accordingly.

14. When driving a double, the lightest trailer should be placed:
In the first position.
In the middle position.
In the rear position.
In any position.

For safest handling when driving a double or triple combination vehicle, the most heavily loaded semi-trailer should be placed in the first position behind the tractor. The lightest trailer should be placed in the rear position.

15. During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.
One half
One quarter
One third
One tenth

Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.

16. When coupling a trailer:
Make sure to couple matching glad hands.
Any glad hand can be connected to any other glad hand.
It is best to leave one glad hand unattached.
Only one set of glad hands should be connected.

When coupling, make sure you couple matching glad hands. They are often color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

17. If the air pressure warning light comes on, you should:
Continue driving normally.
Activate your hazard lights and continue driving.
Call the local law enforcement agency.
Safely exit the roadway and stop.

If the air pressure warning light or buzzer comes on while you are driving, you should immediately stop and safely park the vehicle. This warning signal indicates that there is a problem in the air brake system that needs to be fixed.

18. ____ is a thin layer of ice that forms on road surfaces.
White ice
Black ice
Green ice
Blue ice

Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. This makes the road look as if it is merely wet.

19. When driving a double or triple, it is important to remember that:
The vehicle requires more space than most other vehicles.
Other drivers will likely get out of your way when necessary.
The vehicle likely weighs the same as other vehicles.
The vehicle can easily fit into small spaces.

Doubles and triples need more space than other vehicles, both because they are longer than other vehicles and because their size and weight prevent them from turning or stopping suddenly. When driving a double or triple, always make sure you have enough space before entering traffic, crossing traffic, or changing lanes.

20. How are dolly brakes released?
By opening the air tank petcock
By releasing the supply valve
By closing the supply valve
By turning off the retarder

Release dolly brakes by opening the air tank petcock. If the dolly has spring brakes, use the dolly parking brake control.

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