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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 a tire fails, you should:
push the brake pedal down gradually.
stay off the brake.
apply the brakes as hard as you can without locking the wheels.
brake in a way that will keep your vehicle in a straight line.
2. Air tank drains:
are used to move air to the brakes.
protect the tanks and the rest of the system from too much pressure.
should not be used in wet weather.
are used to remove water and oil from the air tanks.
3. If a trailer does not have spring brakes, to keep the trailer from moving you should:
park on a slight decline.
use wheel chocks.
use the service brakes.
close the brake valve.
4. When coupling, you should:
make sure the trailer kingpin is bent.
make sure the sliding fifth-wheel is locked.
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer wheels are not chocked.
5. Containerized loads are used:
when the cargo has been or will be carried by rail or ship.
when transporting explosives.
when the cargo exceeds the weight limit.
when transporting liquids.
6. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
None of the above.
7. Air storage tanks:
use parts of the service brake systems to stop the vehicle in a brake system failure.
hold compressed air for the brakes.
are installed in the first tank the air compressor pumps air to.
pump air into the air storage tanks.
8. A trailer jackknife is more likely to happen when the trailer is:
loaded to its full capacity.
None of the above.
9. An item that is 15 feet long placed on a flatbed trailer should have at least:
2 tie-downs.
15 tie-downs.
1 tie-down.
3 tie-downs.
10. If you experience a loss of hydraulic pressure, you should do all of the following except:
Use the parking brake
Put the transmission in Neutral
Pump the brakes
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MN CDL Doubles 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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