2026 District Of Columbia DMV Double Endorsement Test 1 (20 Questions And Complete Answers)
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If the low pressure warning light comes on while you are driving:
1. Braking will only be possible if there is still enough air in the tanks.
2. You can apply the brakes 14 times before the air in the system runs out.
3. You should continue to drive normally and check the brake system when it is convenient.
4. You should stay at least 100 feet away from other vehicles.
1. Braking will only be possible if there is still enough air in the tanks.
2. You can apply the brakes 14 times before the air in the system runs out.
3. You should continue to drive normally and check the brake system when it is convenient.
4. You should stay at least 100 feet away from other vehicles.
Braking will only be possible if there is still enough air in the tanks.
When traction is poor, a driver should accelerate slowly:
1. Because it is best to always accelerate very slowly.
2. So they do not lose control of their vehicle.
3. So the driver does not accelerate faster than the vehicle ahead.
4. To be the last vehicle through an intersection.
1. Because it is best to always accelerate very slowly.
2. So they do not lose control of their vehicle.
3. So the driver does not accelerate faster than the vehicle ahead.
4. To be the last vehicle through an intersection.
So they do not lose control of their vehicle.
After connecting the air lines to the trailer while coupling, you should:'
1. Supply air to the trailer.
2. Chock the wheels.
3. Inspect the fifth wheel.
4. Connect the electrical cord.
1. Supply air to the trailer.
2. Chock the wheels.
3. Inspect the fifth wheel.
4. Connect the electrical cord.
Supply air to the trailer.
If the spring brakes are activated, you should never:
1. Push down the brake pedal.
2. Release air from the air storage tanks.
3. Open the hood.
4. Open the door to the cab.
1. Push down the brake pedal.
2. Release air from the air storage tanks.
3. Open the hood.
4. Open the door to the cab.
Push down the brake pedal.
When stopped on the side of the road, the driver should:
1. Keep their side door open.
2. Wave their arms.
3. Turn on their emergency flashers.
4. Turn off all their lights.
1. Keep their side door open.
2. Wave their arms.
3. Turn on their emergency flashers.
4. Turn off all their lights.
Turn on their emergency flashers.
A vehicle inspection is required:
1. For insurance purposes.
2. To get fuel.
3. By state and federal law.
1. For insurance purposes.
2. To get fuel.
3. By state and federal law.
By state and federal law.
Friction inside a brake drum is caused when the brake shoes and linings:
1. Push against each other.
2. Separate from the axle.
3. Create excess heat.
4. Push against the inside of the drum.
1. Push against each other.
2. Separate from the axle.
3. Create excess heat.
4. Push against the inside of the drum.
Push against the inside of the drum.
Coupling can be tested by a driver:
1. Placing their fingers inside the coupling mechanism.
2. Pulling against the pin of the second semi-trailer.
3. Placing glue over the fifth wheel.
4. Releasing the orange lever in the cab.
1. Placing their fingers inside the coupling mechanism.
2. Pulling against the pin of the second semi-trailer.
3. Placing glue over the fifth wheel.
4. Releasing the orange lever in the cab.
Pulling against the pin of the second semi-trailer.
Joggers who are wearing headsets:
1. Are usually aware of what is happening around them.
2. May not be aware of what is happening around them.
3. Can clearly hear sounds of traffic.
4. Usually don’t have music playing.
1. Are usually aware of what is happening around them.
2. May not be aware of what is happening around them.
3. Can clearly hear sounds of traffic.
4. Usually don’t have music playing.
May not be aware of what is happening around them.
Poisonous fumes can enter a truck's cab due to:
1. A defective exhaust system.
2. The wrong type of fuel being used.
3. A lack of oil in the engine.
4. Under-inflated tires.
1. A defective exhaust system.
2. The wrong type of fuel being used.
3. A lack of oil in the engine.
4. Under-inflated tires.
A defective exhaust system.
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