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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the Rhode Island CDL knowledge test. The RI CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the Rhode Island CDL Manual. Take this RI CDL practice test now to prepare for the actual air brakes test!
1. Air pressure should build up in a single air system, within about:
3 minutes.
15 minutes.
10 minutes.
2. When should you be particularly careful about high winds?
When emerging from a tunnel
When going downhill
When driving at night
3. At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________  to be sure it is safe to proceed.
listen, look and stop
stop, look, and listen
go, stop and listen
4. What should you do to correct a drive-wheel braking skid?
Fully apply the brakes, turn the steering wheel quickly, push in the clutch, and countersteer.
Stop braking, turn the steering wheel quickly, push in the clutch, and countersteer.
Turn in the same direction as the skid.
5. ABS:
makes it easier to break.
allows the wheels to lock up.
helps you avoid wheel lock up.
6. The safety valve is usually set to open at:
150 psi.
200 psi.
100 psi.
7. If an aggressive driver is involved in an accident down the road, you should:
try to get their vehicle to the side of the road.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
8. When going down a steep downgrade, you should:
use the parking brake.
use a low gear, and a proper braking technique.
avoid braking and rely on engine braking.
9. As part of the final air brake check, you should:
Check air compressor governor cut-in and cut-out pressure.
Test air leakage rate.
All of the above.
10. If you must stop on a one-way or divided highway, place your warning devices:
10 feet, 50 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
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RI CDL Air Brakes Test

Number of questions: 25
Correct answers to pass:20
Passing score:80%
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