2026 Louisiana DMV Combination Class A Test 1 (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.
Fully-loaded rigs:
1. Are less likely to roll over than empty rigs.
2. Are more likely to roll over than empty rigs.
3. Are just as likely to roll over as empty rigs.
1. Are less likely to roll over than empty rigs.
2. Are more likely to roll over than empty rigs.
3. Are just as likely to roll over as empty rigs.
Are more likely to roll over than empty rigs.
The trailer hand valve should not be used while you are driving because:
1. It will disconnect from the vehicle.
2. You will stop the vehicle too quickly.
3. It can cause a skid.
1. It will disconnect from the vehicle.
2. You will stop the vehicle too quickly.
3. It can cause a skid.
It can cause a skid.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
1. The trailer will stop normally.
2. The trailer will not have brakes.
3. The trailer will speed up.
The trailer will not have brakes.
If a load is placed on one side of a trailer, the trailer:
1. May lean during turns.
2. May add extra support during turns.
3. May be easier to steer during turns.
1. May lean during turns.
2. May add extra support during turns.
3. May be easier to steer during turns.
May lean during turns.
If you are backing and become unsure about your path of travel, you should:
1. Continue backing.
2. Stop and get out to look.
3. Continue backing, but more slowly than before.
1. Continue backing.
2. Stop and get out to look.
3. Continue backing, but more slowly than before.
Stop and get out to look.
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.
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
What is the Johnson bar?
1. A hand valve that works the trailer brakes
2. A valve that indicates the fuel level
3. A valve that limits the amount of cargo
1. A hand valve that works the trailer brakes
2. A valve that indicates the fuel level
3. A valve that limits the amount of cargo
A hand valve that works the trailer brakes
Combination vehicles are usually:
1. Easier to drive than single commercial vehicles.
2. Lighter than single commercial vehicles.
3. More difficult to drive than single commercial vehicles.
1. Easier to drive than single commercial vehicles.
2. Lighter than single commercial vehicles.
3. More difficult to drive than single commercial vehicles.
More difficult to drive than single commercial vehicles.
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