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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. If your vehicle is hydroplaning, you should:
speed up.
stay off the brake.
put the vehicle in reverse.
apply the brakes.
2. The average driver has a reaction time of:
1/16 of a second.
3/4 second to 1 second.
1/32 of a second.
1/8 of a second.
3. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the parking brakes are on and your vehicle is safe to drive.
the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and the wheels are chocked.
cargo is properly blocked.
4. You are driving a vehicle with air brakes when the low air pressure warning light and buzzer come on. You should:
pull off the road and stop immediately.
activate your hazard lights and drive to the nearest place where you can stop.
apply the brakes as hard as you can.
slow down and test your brakes.
5. If there is a cargo fire in a van or box trailer, you should:
keep the doors shut.
keep driving until you reach help.
enlist the help of bystanders.
open the doors, especially if your cargo contains hazardous materials.
6. The best advice for driving in fog is:
use high beams.
use low beams.
drive slowly in the left lane of traffic.
don't drive.
7. If the engine catches fire, you should:
avoid shooting foam from the vehicle's underside.
turn off the engine as soon as you can.
pull into a service station and notify the emergency services.
open the hood as soon as you can.
8. You are more at risk of being fatigued:
when driving during the day.
when driving alone.
after getting more than 8 hours of sleep.
when stopping periodically during long trips.
9. What happens when the center of gravity of a truck moves higher up from the road?
The truck becomes easier to turn over.
It is easier it is to turn around corners.
It becomes much easier to downshift at the right rpm.
The vehicle is more stable while turning.
10. A low air pressure warning signal:
is optional on vehicles with air brakes.
is required on all vehicles without air brakes.
is required on vehicles with air brakes.
None of the above.
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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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