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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Minnesota doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MN CDL doubles triples test covers the following sections of the Minnesota CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MN CDL practice test now to prepare for the actual test!
1. When conducting a pre-trip inspection:
the inspection report should only be reviewed if you will be carrying passengers.
you should review the last vehicle inspection report.
the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
None of the above.
2. What is the most important reason to inspect your vehicle?
Your safety and that of other road users.
Vehicle inspection is required by federal and state laws.
Achieving the best gas mileage.
Saving money by preventing costly repairs.
3. Which of the following is NOT a reason for hydraulic brake failure?
Stab braking
Loss of hydraulic pressure
Brake fade on long hills
All of the above.
4. If an aggressive driver is involved in an accident down the road, you should:
confront the aggressive driver.
make eye contact with the driver.
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.
5. To prevent rollover, you should:
turn the engine off while turning.
drive on the shoulder of the road when possible.
drive slowly around corners.
drive in the left lane.
6. Do NOT use the parking brakes:
when you park for less than two hours.
to test that they work.
if the brakes are very hot.
when you leave your vehicle.
7. With an engine fire, you should NOT:
open the hood.
shoot foam from the vehicle’s underside.
turn the engine off as soon as possible.
None of the above.
8. How far ahead do most good drivers look?
50 to 60 seconds
6 to 8 seconds
12 to 15 seconds
3 to 4 seconds
9. You hear a loud "bang" which sounds like a tire blowout. You should:
keep driving as normal.
assume you have a tire failure.
check the tires at the next stop.
inspect your tires with your mirrors.
10. When the wheels of a trailer lock up:
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
All of the above.
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MN CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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