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Iowa
Iowa CDL Combination 1
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Q.1
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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.2
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When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
The Anti-Lock Braking System
The emergency braking system
The trailer service brakes
Q.3
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The trailer hand valve:
Should always be used for parking.
Should only be used for parking on a downgrade.
Should never be used for parking.
Q.4
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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.5
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A trailer that is too high:
May not couple correctly.
Will couple securely.
Is not an issue.
Q.6
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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.7
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To help prevent a rollover, cargo should be:
Placed as high as possible inside a trailer.
Placed as low as possible inside a trailer.
Placed on the driver’s side of a trailer.
Q.8
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If you must cross traffic while driving a combination vehicle, you should:
Assume other drivers will make room for your vehicle.
Wait for a gap large enough for your vehicle to safely cross.
Rely only on your mirrors.
Q.9
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Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
Q.10
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Keeping cargo centered on a rig can:
Help you drive faster.
Prevent a rollover.
Make turns more dangerous.
Q.11
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If color-coded, which color is used to identify service lines?
White
Yellow
Blue
Q.12
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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.13
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When a vehicle goes around a corner, the rear wheels:
Follow the same path as the front wheels.
Follow a different path than the front wheels.
Should not be a concern to the driver.
Q.14
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Combination vehicles:
Are usually shorter than single commercial vehicles.
Usually require less skill to drive than single commercial vehicles.
Usually require more skill to drive than single commercial vehicles.
Q.15
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The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.16
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If unsure if a trailer has an Anti-Lock Braking System (ABS), you can:
Look under the trailer for wheel speed sensors coming from the back of the brakes.
Remove a tire and look for the ABS sensor on the axle.
Assume it does have ABS.
Q.17
Submit
What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
Q.18
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What is the Johnson bar?
A hand valve that works the trailer brakes
A valve that indicates the fuel level
A valve that limits the amount of cargo
Q.19
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When coupling:
You can assume all vehicles are the same.
Be sure that you are coupling correctly.
Cracks in the mounting are acceptable.
Q.20
Submit
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.
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