2026 District Of Columbia DMV Combination Class A Test 1 (20 Questions And Complete Answers)
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Failure to keep the fifth wheel plate properly greased could:
1. Cause the trailer to disconnect.
2. Cause steering problems.
3. Cause braking problems.
4. Affect the lights.
1. Cause the trailer to disconnect.
2. Cause steering problems.
3. Cause braking problems.
4. Affect the lights.
Cause steering problems.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
1. Using the air brakes.
2. Using wheel chocks.
3. Parking near a wall.
4. Parking on a slight incline.
1. Using the air brakes.
2. Using wheel chocks.
3. Parking near a wall.
4. Parking on a slight incline.
Using wheel chocks.
A combination vehicle has:
1. One air line.
2. Two air lines.
3. Three air lines.
4. Four air lines.
1. One air line.
2. Two air lines.
3. Three air lines.
4. Four air lines.
Two air lines.
Avoid needing to make sudden lane changes by:
1. Using your horn to encourage other drivers to move out of your lane.
2. Only driving slower than the posted speed limit.
3. Watching the road ahead while driving.
4. Pulling off the road and waiting when there is high traffic.
1. Using your horn to encourage other drivers to move out of your lane.
2. Only driving slower than the posted speed limit.
3. Watching the road ahead while driving.
4. Pulling off the road and waiting when there is high traffic.
Watching the road ahead while driving.
During a trip, which shut-off valves should be open?
1. All shut-off valves should be open.
2. The rear shut-off valves should be open.
3. All shut-off valves should be in the open position, except the rear shut-off valves.
4. No shut-off valves should be open.
1. All shut-off valves should be open.
2. The rear shut-off valves should be open.
3. All shut-off valves should be in the open position, except the rear shut-off valves.
4. No shut-off valves should be open.
All shut-off valves should be in the open position, except the rear shut-off valves.
In a combination rig, it is best to make:
1. Quick, sudden stops.
2. Sharp turns.
3. Quick accelerations.
4. Slow, planned stops.
1. Quick, sudden stops.
2. Sharp turns.
3. Quick accelerations.
4. Slow, planned stops.
Slow, planned stops.
If a load is placed on one side of a trailer, the trailer:
1. May lean, and could result in a rollover.
2. May add extra support during turns.
3. Have improved braking.
4. Have improved steering.
1. May lean, and could result in a rollover.
2. May add extra support during turns.
3. Have improved braking.
4. Have improved steering.
May lean, and could result in a rollover.
To prevent a trailer from rolling over, you should:
1. Speed up when nearing a corner.
2. Make sudden steering moves.
3. Take on-ramps faster than the posted speed limit.
4. Drive slowly around corners.
1. Speed up when nearing a corner.
2. Make sudden steering moves.
3. Take on-ramps faster than the posted speed limit.
4. Drive slowly around corners.
Drive slowly around corners.
When the wheels of a trailer lock up:
1. The trailer will stay straight.
2. The trailer tends to swing around.
3. The cab will swing, but the trailer will stay straight.
4. They will likely go flat.
1. The trailer will stay straight.
2. The trailer tends to swing around.
3. The cab will swing, but the trailer will stay straight.
4. They will likely go flat.
The trailer tends to swing around.
If unsure if a trailer is equipped with ABS, you can:
1. Check under the trailer for wheel speed sensors coming from the back of the brakes.
2. Try driving on a slippery surface and see if ABS kicks in.
3. Assume it does have ABS.
4. Remove a tire and look for the ABS sensor on the axle.
1. Check under the trailer for wheel speed sensors coming from the back of the brakes.
2. Try driving on a slippery surface and see if ABS kicks in.
3. Assume it does have ABS.
4. Remove a tire and look for the ABS sensor on the axle.
Check under the trailer for wheel speed sensors coming from the back of the brakes.
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