2026 Louisiana DMV Combination Class A Test 2 (20 Questions And Complete Answers)
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Shut-off valves':
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
1. Prevent air from escaping air brake systems.
2. Prevent air from entering air brake systems.
3. Override vehicles that are out of control.
Prevent air from escaping air brake systems.
Rollovers happen when:
1. You drive too slowly.
2. You are stopped.
3. You take a turn too fast.
1. You drive too slowly.
2. You are stopped.
3. You take a turn too fast.
You take a turn too fast.
When driving with trailers, you should:
1. Make quick, sudden changes.
2. Avoid making sudden moves.
3. Accelerate by pushing the accelerator to the floor.
1. Make quick, sudden changes.
2. Avoid making sudden moves.
3. Accelerate by pushing the accelerator to the floor.
Avoid making sudden moves.
When glad hands are coupled, the seals should be pressed together at a ____ angle.
1. 50-degree
2. 180-degree
3. 90-degree
1. 50-degree
2. 180-degree
3. 90-degree
90-degree
Before beginning a trip, you should:
1. Leave the service line valve open.
2. Remove the relay valves.
3. Close the emergency line valve.
1. Leave the service line valve open.
2. Remove the relay valves.
3. Close the emergency line valve.
Close the emergency line valve.
Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
1. Quicker
2. Easier
3. More difficult
1. Quicker
2. Easier
3. More difficult
More difficult
Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
1. One second
2. Two seconds
3. Three seconds
1. One second
2. Two seconds
3. Three seconds
One second
If you are backing and become unsure about your path of travel, you should:
1. Continue backing.
2. Continue backing, but more slowly than before.
3. Stop and get out to look.
1. Continue backing.
2. Continue backing, but more slowly than before.
3. Stop and get out to look.
Stop and get out to look.
When backing up your tractor while coupling it to a trailer, the trailer brakes should be:
1. Deactivated.
2. Locked.
3. Unlocked
1. Deactivated.
2. Locked.
3. Unlocked
Locked.
A combination vehicle has ____ air line(s).
1. One
2. Two
3. Three
1. One
2. Two
3. Three
Two
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