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Louisiana
Louisiana CDL Combination 2
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Q.1
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Shut-off valves:
Prevent air from escaping air brake systems.
Prevent air from entering air brake systems.
Override vehicles that are out of control.
Q.2
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Rollovers happen when:
You drive too slowly.
You are stopped.
You take a turn too fast.
Q.3
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When driving with trailers, you should:
Make quick, sudden changes.
Avoid making sudden moves.
Accelerate by pushing the accelerator to the floor.
Q.4
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When glad hands are coupled, the seals should be pressed together at a ____ angle.
50-degree
180-degree
90-degree
Q.5
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Before beginning a trip, you should:
Leave the service line valve open.
Remove the relay valves.
Close the emergency line valve.
Q.6
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Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Quicker
Easier
More difficult
Q.7
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Maintain a following distance of at least ____ for every 10 feet of your vehicle if you are traveling at a speed under 40 mph.
One second
Two seconds
Three seconds
Q.8
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If you are backing and become unsure about your path of travel, you should:
Continue backing.
Stop and get out to look.
Continue backing, but more slowly than before.
Q.9
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When backing up your tractor while coupling it to a trailer, the trailer brakes should be:
Deactivated.
Locked.
Unlocked.
Q.10
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A combination vehicle has ____ air line(s).
One
Two
Three
Q.11
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Trailers with low underneath clearance can present challenges when driving over:
Bridges.
Railroad tracks.
Overpasses.
Q.12
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If you press the tractor air supply control and your trailer's spring brakes do not release, you should:
Inspect the air line connections.
Activate the Anti-Lock Braking System.
Turn the engine off and on again.
Q.13
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If color-coded, which color is used to identify emergency, or supply, lines?
White
Yellow
Red
Q.14
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If your vehicle gets stuck on railroad tracks, you should:
Sit in the cab and call for help.
Exit the cab and walk away from the tracks.
Motion for another driver to push your vehicle.
Q.15
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Keeping cargo low can:
Prevent a rollover.
Help you drive faster.
Make turns more dangerous.
Q.16
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The best way to recognize that your trailer has started to skid is by:
Seeing other drivers' faces.
Checking the trailer in your mirrors.
Feeling the trailer move.
Q.17
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When should the trailer hand valve be used?
Only when the trailer is carrying a load
Only to test the trailer’s brakes
Only in inclement weather when the trailer may skid
Q.18
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The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.19
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All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
Q.20
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In a double or triple combination, the ____ trailer should be directly behind the cab.
Lightest
Heaviest
Smallest
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