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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. In newer vehicles with air brakes, you put on the parking brake:
moving the orange push-pull lever to the right.
using a P-shaped, yellow control knob.
placing the transmission in Park.
using a diamond-shaped, yellow, push-pull control knob.
2. To prevent rollover, you should:
drive slowly around on ramps and off ramps.
go slowly around turns.
keep the cargo as close to the ground as possible.
All of the above.
3. Which of the following is not a type of retarder?
4. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.
None of the above.
5. Too much weight on the steering axle can cause:
poor traction.
hard steering and damage to the steering axle and tires.
better handling.
None of the above.
6. Which of the following is not a sign of fatigue?
Rubbing eyes
Keeping a steady speed
Yawning repeatedly
Frequent blinking
7. The tire load for each tire is stated:
on the inside of the tire.
on the side of the tire.
on the vehicle's operator manual.
on the tread of the tire.
8. It is safer to drive over (rather than to avoid) which of the following?
Cardboard boxes
Paper and cloth sacks
Plastic containers
None of the above.
9. When driving a 50-foot truck at 40 mph, your minimum following distance should be:
4 seconds
6 seconds
8 seconds
5 seconds
10. It may not be safe to operate at legal maximum weights:
on two-way streets.
in hot weather.
on highways.
during bad weather or in mountains.
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MN CDL Doubles Triples 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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