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Driving Test
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Driving Test
Mississippi
Mississippi CDL Combination 2
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Q.1
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The trailer hand valve should be used:
To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.
Q.2
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If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
Using the air brakes.
Using wheel chocks.
Parking near a wall.
Parking on a slight incline.
Q.3
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A combination vehicle has:
One air line.
Two air lines.
Three air lines.
Four air lines.
Q.4
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Combination vehicles need extra space on the road because they:
Drive more slowly than other commercial motor vehicles.
Are heavier than other commercial motor vehicles.
Need more space to turn and stop than other commercial motor vehicles.
Q.5
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What can the “crack-the-whip” effect do?
Turn over trailers.
Make loud noises.
Make trucks accelerate.
Make trucks decelerate.
Q.6
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Rollovers happen when:
Drivers turn too quickly.
Drivers turn too slowly.
It is raining.
Q.7
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What does the trailer air supply control look like?
It is a square blue knob.
It is a triangular yellow knob.
It is an eight-sided red knob.
It is a circular orange knob.
Q.8
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Large combination vehicles take the longest amount of time to stop:
When fully loaded.
When partially loaded.
When empty.
When mostly loaded.
Q.9
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During a trip, the ____ should be open.
Rear service line shut-off valve
Rear supply line shut-off valve
Inner shut-off valves
Q.10
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The "crack-the-whip" effect can:
Turn over a trailer.
Be more effective than braking.
Make a truck move faster.
Q.11
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Look into the back of the fifth wheel:
While testing your air brakes.
If your vehicle begins to skid.
When inspecting a coupling.
Q.12
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How much space should be between the upper and lower fifth wheel?
About five inches of space
A maximum of two inches of space
No space
Q.13
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Combination vehicles:
Often have taller trailers than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
Q.14
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What does the tractor protection valve do?
Protects the tractor from being stolen
Protects the tractor from exceeding a set speed
Keeps air in the braking system, should the trailer break away or develop a leak
Ensures oil adequately lubricates the engine
Q.15
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The trailer hand valve should be used:
To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.
To test the lights on the trailer.
Q.16
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If the emergency air line loses pressure:
The Anti-Lock Braking System will activate.
The service air line will activate.
The emergency brakes will activate.
Q.17
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If color-coded, which color is used to identify emergency, or supply, lines?
White
Yellow
Red
Q.18
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When backing up your tractor while coupling it to a trailer, the trailer brakes should be:
Deactivated.
Locked.
Unlocked.
Q.19
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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.20
Submit
If a trailer begins to jackknife, you should not:
Release the brakes.
Apply the trailer hand brake.
Allow the wheels to grip the road.
Allow the trailer to straighten out.
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