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North Carolina
North Carolina CDL Combination 1
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Q.1
Submit
____ are the cause of more than half of all accident-related truck driver deaths.
Truck rollovers
Motorcycles
Slippery roads
Pedestrians
Q.2
Submit
Emergency air lines are often coded with the color:
Green.
Orange.
Yellow.
Red.
Q.3
Submit
When you are pulling a trailer, the air supply control lever should be in its ____ position.
Emergency
Supply
Normal
Q.4
Submit
Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1943
1998
2009
2015
Q.5
Submit
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.6
Submit
Which type of vehicle is most prone to the “crack-the-whip” effect?
A five-axle tractor semi-trailer
A three-axle tractor semi-trailer
A bobtail tractor
A triple trailer
Q.7
Submit
The trailer hand valve should be used:
To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.
Q.8
Submit
A driver should test the tractor protection valve by:
Pulling the yellow, diamond-shaped knob.
Releasing air with the brake pedal.
Unlocking the trailer doors.
Q.9
Submit
A loss of air pressure in the emergency line will cause:
The service brakes to activate.
The tractor protection valve to close.
The rear trailer to detach from the combination.
The suspension springs to extend.
Q.10
Submit
If a trailer's spring brakes do not release when you push the tractor air supply control, you should:
Check the air line connections.
Release the pintle hook.
Replace the spring brakes.
Drive normally without checking anything.
Q.11
Submit
When entering or crossing traffic while driving a combination vehicle, it is especially important that you:
Sound your horn.
Make sure there is a large enough gap for your vehicle.
Expect other drivers to make room for your vehicle.
Let other drivers wave you into their lane.
Q.12
Submit
A trailer will be most likely to swing around when:
It is full.
Traveling in a straight line.
It is empty.
The wheels are rotating.
Q.13
Submit
Using the trailer hand valve while driving:
Will help you turn safely.
Will stop your trailer safely.
Can cause a skid.
Is impossible.
Q.14
Submit
The trailer hand valve:
Should always be used for parking.
Should only be used for parking on a downhill.
Should never be used for parking.
Should only be used when transporting cargo.
Q.15
Submit
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.16
Submit
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Air pressure drops to a level between 20 and 45 psi.
You are experiencing a trailer jackknife.
Wheels have regained traction after a skid.
Air pressure is above 45 psi.
Q.17
Submit
If unsure if a trailer is equipped with ABS, you can:
Check under the trailer for wheel speed sensors coming from the back of the brakes.
Try driving on a slippery surface and see if ABS kicks in.
Assume it does have ABS.
Remove a tire and look for the ABS sensor on the axle.
Q.18
Submit
What happens when the wheels of a trailer lock up?
The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
The trailer will stop.
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