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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. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The last trailer of doubles
The front trailer of 65 ft. conventional doubles
The last trailer of triples
5-axle tractor semitrailers
2. Most heavy duty vehicles use ___ air brake systems for safety.
3. Overloading a vehicle with cargo can have negative effects on all of the following except:
Weight limits
Speed control
4. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
The front trailer is twice as likely to turn over as the tractor.
None of the above.
5. What is true about tire chains?
You should watch the official video tutorial by the manifacturer before putting them on.
You must carry the at least 6 chains and extra cross-links.
You should learn how to put the chains on before you need to do it in snow.
All of the above.
6. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
hydraulic brakes.
a rear backup camera.
anti-lock brakes.
7. Which of the following will NOT help you prevent rollover?
Keeping the cargo as close to the ground as possible.
Driving slowly around turns.
Using the controlled braking method.
All of the above.
8. What is the minimum tread depth for tires other than front tires?
4/32 inch
2/32 inch
4/16 inch
8/32 inch
9. In a dual air brake system, if one air system is very low on pressure:
you should drive and brake as you always have.
the effect won't be noticeable for the first 50 miles.
you should pump the brakes to restore pressure.
either the front or rear brakes will not be operating fully.
10. Rough acceleration can cause:
damage electrical and brake lines.
mechanical damage.
tire damage.
All of the above.
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MN Doubles Triples CDL Test

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